243 Ida - Knowledge

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disruption event occurred. According to an analysis of Ida's cratering processes, its surface is more than a billion years old. However, this is inconsistent with the estimated age of the Ida–Dactyl system of less than 100 million years; it is unlikely that Dactyl, due to its small size, could have escaped being destroyed in a major collision for longer. The difference in age estimates may be explained by an increased rate of cratering from the debris of the Koronis parent body's destruction.

1778: 1096: 979: 1156: 5131: 937: 1012:. Although there are a few steep slopes tilting up to about 50° on Ida, the slope generally does not exceed 35°. Ida's irregular shape is responsible for the asteroid's very uneven gravitational field. The surface acceleration is lowest at the extremities because of their high rotational speed. It is also low near the "waist" because the mass of the asteroid is concentrated in the two halves, away from this location. 582:, creatures which inhabited Mount Ida in Greek mythology. Dactyl is only 1.4 kilometres (0.87 mi) in diameter, about 1/20 the size of Ida. Its orbit around Ida could not be determined with much accuracy, but the constraints of possible orbits allowed a rough determination of Ida's density and revealed that it is depleted of metallic minerals. Dactyl and Ida share many characteristics, suggesting a common origin. 1021: 5155: 34: 867: 5107: 1265: 5143: 5119: 1332: 2905:

with all three abundant enough to be classified as potential ores. All three contain feldspar (an aluminosilicate of calcium, sodium, and potassium), pyroxene (silicates with one silicon atom for each atom of magnesium, iron, or calcium), olivine (silicates with two iron or magnesium atoms per silicon atom), metallic iron, and iron sulfide (the mineral

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diameter greater than 80 m (260 ft), indicating that the moon has suffered many collisions during its history. At least six craters form a linear chain, suggesting that it was caused by locally produced debris, possibly ejected from Ida. Dactyl's craters may contain central peaks, unlike those found on Ida. These features, and Dactyl's

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recently or uncovered by an impact event. Most of them are located within the craters Lascaux and Mammoth, but they may not have been produced there. This area attracts debris due to Ida's irregular gravitational field. Some blocks may have been ejected from the young crater Azzurra on the opposite side of the asteroid.

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Ida's region 2 features several sets of grooves, most of which are 100 m (330 ft) wide or less and up to 4 km (2.5 mi) long. They are located near, but are not connected with, the craters Mammoth, Lascaux, and Kartchner. Some grooves are related to major impact events, for example

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trajectory carried it into the asteroid belt twice on its way to Jupiter. During its second crossing, it flew by Ida on 28 August 1993 at a speed of 12,400 m/s (41,000 ft/s) relative to the asteroid. The onboard imager observed Ida from a distance of 240,350 km (149,350 mi) to its

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Both of these discoveries—the space weathering effects and the low density—led to a new understanding about the relationship between S-type asteroids and OC meteorites. S-types are the most numerous kind of asteroid in the inner part of the asteroid belt. OC meteorites are, likewise, the most common

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was taking place on Ida, a process which causes older regions to become more red in color over time. The same process affects both Ida and its moon, although Dactyl shows a lesser change. The weathering of Ida's surface revealed another detail about its composition: the reflection spectra of freshly

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and Jupiter, like all main-belt asteroids. Its orbital period is 4.84 years, and its rotation period is 4.63 hours. Ida has an average diameter of 31.4 km (19.5 mi). It is irregularly shaped and elongated, apparently composed of two large objects connected together. Its surface is one of

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The chondrites fall naturally into five composition classes, of which three have very similar mineral contents, but different proportions of metal and silicates. All three contain abundant iron in three different forms (ferrous iron oxide in silicates, metallic iron, and ferrous sulfide), usually

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Dactyl is an "egg-shaped" but "remarkably spherical" object measuring 1.6 by 1.4 by 1.2 kilometres (0.99 by 0.87 by 0.75 mi). It is oriented with its longest axis pointing towards Ida. Like Ida, Dactyl's surface exhibits saturation cratering. It is marked by more than a dozen craters with a

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flyby, many different theories had been proposed to explain their mineral composition. Determining their composition permits a correlation between meteorites falling to the Earth and their origin in the asteroid belt. Data returned from the flyby pointed to S-type asteroids as the source for the

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Nearly a month after a successful photo session, the Galileo spacecraft last week finished radioing to Earth a high-resolution portrait of the second asteroid ever to be imaged from space. Known as 243 Ida, the asteroid was photographed from an average distance of just 3,400 kilometers some 3.5

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Ida is one of the most densely cratered bodies yet explored in the Solar System, and impacts have been the primary process shaping its surface. Cratering has reached the saturation point, meaning that new impacts erase evidence of old ones, leaving the total crater count roughly the same. It is

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About 20 large (40–150 m across) ejecta blocks have been identified, embedded in Ida's regolith. Ejecta blocks constitute the largest pieces of the regolith. Because ejecta blocks are expected to break down quickly by impact events, those present on the surface must have been either formed

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Ida originated in the breakup of the roughly 120 km (75 mi) diameter Koronis parent body. The progenitor asteroid had partially differentiated, with heavier metals migrating to the core. Ida carried away insignificant amounts of this core material. It is uncertain how long ago the

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Dactyl may have originated at the same time as Ida, from the disruption of the Koronis parent body. However, it may have formed more recently, perhaps as ejecta from a large impact on Ida. It is extremely unlikely that it was captured by Ida. Dactyl may have suffered a major impact around

925:. Estimates of Ida's density are constrained to less than 3.2 g/cm by the long-term stability of Dactyl's orbit. This all but rules out a stony-iron composition; were Ida made of 5 g/cm iron- and nickel-rich material, it would have to contain more than 40% empty space. 1003:

Ida is a distinctly elongated asteroid, with an irregular surface. Ida is 2.35 times as long as it is wide, and a "waist" separates it into two geologically dissimilar halves. This constricted shape is consistent with Ida being made of two large, solid components, with loose

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recorded 47 images of Dactyl over an observation period of 5.5 hours in August 1993. The spacecraft was 10,760 kilometres (6,690 mi) from Ida and 10,870 kilometres (6,750 mi) from Dactyl when the first image of the moon was captured, 14 minutes before

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parent body. The largest crater, Lascaux, is almost 12 km (7.5 mi) across. Region 2 contains nearly all of the craters larger than 6 km (3.7 mi) in diameter, but Region 1 has no large craters at all. Some craters are arranged in chains.

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and Ida were secondary to the Jupiter mission. These were selected as targets in response to a new NASA policy directing mission planners to consider asteroid flybys for all spacecraft crossing the belt. No prior missions had attempted such a flyby.

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produces an acceleration of about 0.3 to 1.1 cm/s over its surface. This field is so weak that an astronaut standing on its surface could leap from one end of Ida to the other, and an object moving in excess of 20 m/s (70 ft/s) could

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Greeley, Ronald; Sullivan, Robert J.; Pappalardo, R.; Head, J.; Veverka, Joseph; Thomas, Peter C.; Lee, P.; Belton, M.; Chapman, Clark R. (March 1994). "Morphology and Geology of Asteroid Ida: Preliminary Galileo Imaging Observations".

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If in a circular orbit at the distance at which it was seen, Dactyl's orbital period would be about 20 hours. Its orbital speed is roughly 10 m/s (33 ft/s), "about the speed of a fast run or a slowly thrown baseball".

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must be more than about 65 km (40 mi) from Ida for it to remain in a stable orbit. The range of orbits generated by the simulations was narrowed down by the necessity of having the orbits pass through points at which

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The craters are simple in structure: bowl-shaped with no flat bottoms and no central peaks. They are distributed evenly around Ida, except for a protrusion north of crater Choukoutien which is smoother and less cratered. The

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variations across its surface. An exception to the crater morphology is the fresh, asymmetric Fingal, which has a sharp boundary between the floor and wall on one side. Another significant crater is Afon, which marks Ida's

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found minimal variations on the surface, and the asteroid's spin indicates a consistent density. Assuming that its composition is similar to OC meteorites, which range in density from 3.48 to 3.64 g/cm, Ida would have a

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Archinal, B. A.; Acton, C. H.; A'Hearn, M. F.; Conrad, A.; Consolmagno, G. J.; Duxbury, T.; et al. (February 2018). "Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2015".

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and mostly gray, although minor color variations mark newly formed or uncovered areas. Besides craters, other features are evident, such as grooves, ridges, and protrusions. Ida is covered by a thick layer of

1256:. The megaregolith layer of Ida extends between hundreds of meters below the surface to a few kilometers. Some rock in Ida's core may have been fractured below the large craters Mammoth, Lascaux, and Undara. 1632:

spacecraft during its flyby in 1993. These images provided the first direct confirmation of an asteroid moon. At the time, it was separated from Ida by a distance of 90 kilometres (56 mi), moving in a

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When Zeus was born, Rhea entrusted the guardianship of her son to the Dactyls of Ida, who are the same as those called Curetes. They came from Cretan Ida – Heracles, Paeonaeus, Epimedes, Iasius and

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and Edward F. Tedesco as part of the eight-color asteroid survey (ECAS). Its spectrum matched those of the asteroids in the S-type classification. Many observations of Ida were made in early 1993 by the

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of a uniformly dense object the same shape as Ida coincides with the spin axis of the asteroid. This suggests that there are no major variations of density within the asteroid. Ida's axis of rotation

1637:. Dactyl is heavily cratered, like Ida, and consists of similar materials. Its origin is uncertain, but evidence from the flyby suggests that it originated as a fragment of the Koronis parent body. 735:

closest approach of 2,390 km (1,490 mi). Ida was the second asteroid, after Gaspra, to be imaged by a spacecraft. About 95% of Ida's surface came into view of the probe during the flyby.

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Belton, M. J. S.; Chapman, C. R.; Thomas, P. C.; Davies, M. E.; Greenberg, R.; Klaasen, K.; et al. (1995). "Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl".

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Chapman, Clark R.; Belton, Michael J. S.; Veverka, Joseph; Neukum, G.; Head, J.; Greeley, Ronald; Klaasen, K.; Morrison, D. (March 1994). "First Galileo image of asteroid 243 Ida".

1177:. Azzurra seems to be the most recent major impact on Ida. The ejecta from this collision is distributed discontinuously over Ida and is responsible for the large-scale color and 3822:

Lee, Pascal; Veverka, Joseph; Thomas, Peter C.; Helfenstein, Paul; Belton, Michael J. S.; Chapman, Clark R.; Greeley, Ronald; Pappalardo, Robert T.; et al. (March 1996).

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are very similar. The small differences indicate that the space weathering process is less active on Dactyl. Its small size would make the formation of significant amounts of

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covered with craters of all sizes and stages of degradation, and ranging in age from fresh to as old as Ida itself. The oldest may have been formed during the breakup of the

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type of meteorite found on the Earth's surface. The reflection spectra measured by remote observations of S-type asteroids, however, did not match that of OC meteorites. The

4137: 3768: 728:. Mission planners delayed the decision to attempt a flyby until they were certain that this would leave the spacecraft enough propellant to complete its Jupiter mission. 3379: 1690:

shape, imply that the moon is gravitationally controlled despite its small size. Like Ida, its average temperature is about 200 K (−73 °C; −100 °F).

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observed Ida for eight hours and was unable to spot Dactyl. It would have been able to observe it if it were more than about 700 km (430 mi) from Ida.

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Chapman, Clark R.; Ryan, Eileen V.; Merline, William J.; Neukum, Gerhard; Wagner, Roland; Thomas, Peter C.; Veverka, Joseph; Sullivan, Robert J. (March 1996).

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Berger, Peter (2003). "The Gildemeester Organisation for Assistance to Emigrants and the expulsion of Jews from Vienna, 1938–1942". In Gourvish, Terry (ed.).

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Belton, M. J. S.; Chapman, Clark R.; Klaasen, Kenneth P.; Harch, Ann P.; Thomas, Peter C.; Veverka, Joseph; McEwen, Alfred S.; Pappalardo, Robert T. (1996).

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Geissler, Paul E.; Petit, Jean-Marc; Greenberg, Richard (1996). "Ejecta Reaccretion on Rapidly Rotating Asteroids: Implications for 243 Ida and 433 Eros".

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Sullivan, Robert J.; Greeley, Ronald; Pappalardo, R.; Asphaug, E.; Moore, J. M.; Morrison, D.; Belton, Michael J. S.; Carr, M.; et al. (March 1996).

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Petit, Jean-Marc; Durda, Daniel D.; Greenberg, Richard; Hurford, Terry A.; Geissler, Paul E. (November 1997). "The Long-Term Dynamics of Dactyl's Orbit".

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Greenberg, Richard; Bottke, William F.; Nolan, Michael; Geissler, Paul E.; Petit, Jean-Marc; Durda, Daniel D.; Asphaug, Erik; Head, James (March 1996).

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Chapman, Clark R. (October 1996). "S-Type Asteroids, Ordinary Chondrites, and Space Weathering: The Evidence from Galileo's Fly-bys of Gaspra and Ida".

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Monet, A. K. B.; Stone, R. C.; Monet, D. G.; Dahn, C. C.; Harris, H. C.; Leggett, S. K.; Pier, J. R.; Vrba, F. J.; Walker, R. L. (June 1994).

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Geissler, Paul E.; Petit, Jean-Marc; Durda, Daniel D.; Greenberg, Richard; Bottke, William F.; Nolan, Michael; Moore, Jeffrey (March 1996).

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observed Dactyl to be at 16:52:05 UT on 28 August 1993, about 90 km (56 mi) from Ida at longitude 85°. On 26 April 1994, the

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Thomas, Peter C.; Belton, Michael J. S.; Carcich, B.; Chapman, Clark R.; Davies, M. E.; Sullivan, Robert J.; Veverka, Joseph (1996).

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excavated by impacts is deposited differently on Ida than on planets because of its rapid rotation, low gravity and irregular shape.

4778: 750:. The remaining images were sent in February 1994, when the spacecraft's proximity to the Earth allowed higher speed transmissions. 654: 4676: 4523: 4199:

Zellner, Ben; Tholen, David J.; Tedesco, Edward F. (March 1985). "The eight-color asteroid survey: Results for 589 minor planets".

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based on the similarity of its reflectance spectra with similar asteroids. S-types may share their composition with stony-iron or

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of Dactyl's orbit when most of the images were taken, which made determining its exact orbit difficult. Dactyl orbits in the

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exposed parts of the surface resembled that of OC meteorites, but the older regions matched the spectra of S-type asteroids.

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Chapman, Clark R.; Klaasen, K.; Belton, Michael J. S.; Veverka, Joseph (July 1994). "Asteroid 243 IDA and its satellite".

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settle asymmetrically around their craters, but fast-moving ejecta that escapes from the asteroid is permanently lost.

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The Standard American Encyclopedia of Arts, Sciences, History, Biography, Geography, Statistics, and General Knowledge

2909:). These three classes, referred to collectively as the ordinary chondrites, contain quite different amounts of metal. 1307:

with a period of 77 thousand years, due to the gravity of the Sun acting upon the nonspherical shape of the asteroid.

670:. These improved the measurement of Ida's orbit around the Sun and reduced the uncertainty of its position during the 5217: 4856: 3530:

Chapman, Clark R. (September 1995). "Galileo Observations of Gaspra, Ida, and Dactyl: Implications for Meteoritics".

1433: 1123:, connected by a "waist". This feature may have been filled in by debris, or blasted out of the asteroid by impacts. 589:

and the subsequent measurement of Ida's mass provided new insights into the geology of S-type asteroids. Before the

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Several major structures mark Ida's surface. The asteroid appears to be split into two halves, here referred to as

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flyby of Ida found that some S-types, particularly the Koronis family, could be the source of these meteorites.

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The Eos and Koronis families ... are entirely of type S, which is rare at their heliocentric distances ...

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asteroids. Ida orbits the Sun at an average distance of 2.862 AU (428.1 Gm), between the orbits of

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flybys, but was interpreted to be either of two minerals found in meteorites that had fallen to the Earth:

1092:. Because of this process, older regolith appears more red in color compared to freshly exposed material. 5061: 553:, the most numerous type in the inner asteroid belt. On 28 August 1993, Ida was visited by the uncrewed 5182: 5097: 4618: 1126:

Region 1 of Ida contains two major structures. One is a prominent 40 km (25 mi) ridge named

563:. It was the second asteroid visited by a spacecraft and the first found to have a natural satellite. 5197: 3010: 1916: 1361: 1008:

filling the gap between them. However, no such debris was seen in high-resolution images captured by

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that stretches 150 degrees around Ida's surface. The other structure is a large indentation named

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the most heavily cratered in the Solar System, featuring a wide variety of crater sizes and ages.

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D'Amario, Louis A.; Bright, Larry E.; Wolf, Aron A. (May 1992). "Galileo trajectory design".

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direction and is inclined about 8° to Ida's equator. Based on computer simulations, Dactyl's

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on Earth. The crater Azzurra, for example, is named after a submerged cave on the island of

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Images from the flyby, starting 5.4 hours before closest approach and showing Ida's rotation

650:, who proposed in 1918 that the group comprised the remnants of a destroyed precursor body. 5021: 4911: 4809: 4770: 4668: 4643: 4569: 4515: 4208: 4169: 4105: 4067: 4019: 3973: 3942: 3907: 3882: 3838: 3800: 3752: 3724: 3680: 3636: 3593: 3560: 3539: 3518: 3497: 3453: 3411: 3363: 3324: 3313: 3292: 1998: 922: 742:. The first five images were received in September 1993. These comprised a high-resolution 738:

Transmission of many Ida images was delayed due to a permanent failure in the spacecraft's

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mission member Ann Harch, while examining delayed image downloads from the spacecraft.

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Ida's moon Dactyl was discovered by mission member Ann Harch in images returned from

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impossible. This contrasts with Ida, which is covered by a deep layer of regolith.

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Size comparison of Ida, several other asteroids, the dwarf planet Ceres, and Mars

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Byrnes, Dennis V.; D'Amario, Louis A.; Galileo Navigation Team (December 1994).

3789:"Tidal Evolution by Elongated Primaries: Implications for the Ida/Dactyl System" 47:

is located on the right "tip" of the asteroid. The dot to the right is its moon

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trajectory to approach Ida required that it consume 34 kg (75 lb) of

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Vokrouhlicky, David; Nesvorny, David; Bottke, William F. (11 September 2003).

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Ida's interior probably contains some amount of impact-fractured rock, called

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Cowen, Ron (2 October 1993). "Close-up of an asteroid: Galileo eyes Ida".

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Bottke, William F. Jr.; Cellino, A.; Paolicchi, P.; Binzel, R. P. (2002).

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of 2.27–3.10 g/cm. OC meteorites contain varying amounts of the silicates

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Asymmetric 1.5 km (0.93 mi) wide crater Fingal at 13.2°S, 39.9°E

1095: 4463:. Cambridge Planetary Science. Vol. 11. Cambridge University Press. 3813: 3788: 3400:"Galileo's Encounter with 243 Ida: An Overview of the Imaging Experiment" 1599: 854: 478: 455: 4600:"Idiosyncrasies of Ida—asteroid 243 Ida's irregular gravitational field" 4436: 4117: 3488:

Chapman, Clark R. (1994). "The Galileo Encounters with Gaspra and Ida".

2926: 2750: 2692: 2641: 2384: 2294: 4342:. Translated by Jones, W. H. S.; Omerod, H. A. Loeb Classical Library. 3648: 2962: 2960: 2958: 2956: 1972: 1970: 1238:. The mineral content appears to be homogeneous throughout its extent. 834: 725: 701: 217: 44: 3931:"The overlapping plates method applied to CCD observations of 243 Ida" 3157: 3155: 2682: 2680: 2603: 2601: 2599: 2524: 1055:

The surface of Ida is covered in a blanket of pulverized rock, called

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Mining the Sky: Untold Riches from the Asteroids, Comets, and Planets

3050: 3048: 3046: 2714: 2712: 2710: 2374: 2372: 2052: 2050: 2048: 2010: 1164: 4694:"Discovery of Ida's Moon Indicates Possible "Families" of Asteroids" 3241: 2953: 1967: 1155: 5084: 4729:"Johann Palisa, the most successful visual discoverer of asteroids" 3955: 3930: 3920: 3895: 3281: 3152: 2906: 2677: 2596: 2536: 2075: 1702: 1698: 1687: 1252: 1244: 1231: 1223: 1085: 1077: 1057: 1038: 978: 526: 3441:

Britt, D. T.; Yeomans, D. K.; Housen, K.; Consolmagno, G. (2002).

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and redistributed across Ida's surface by geological processes.

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Ida's mass is between 3.65 and 4.99 × 10 kg. Its

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Ida was discovered on 29 September 1884 by Austrian astronomer

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meteorites, the most common type found on the Earth's surface.

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Orbit and positions of Ida and five planets as of 9 March 2009

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Trajectory of Galileo from launch to Jupiter orbital insertion

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Abstracts of the 25th Lunar and Planetary Science Conference

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Abstracts of the 25th Lunar and Planetary Science Conference

4091:"The vector alignments of asteroid spins by thermal torques" 3896:"Astrometry for the Galileo mission. 1: Asteroid encounters" 3735: 3350: 3247: 2966: 2832: 2607: 2399: 2200: 1264: 1088:. Its appearance changes over time through a process called 4860: 3821: 3663: 3508: 3161: 3142: 3140: 2871: 2718: 2686: 2671: 2635: 2554: 2542: 1749: 1726: 1504: 1501: 1281: 1227: 639: 567: 390: 191: 179: 128: 122: 5118: 4563: 4156:

Wilson, Lionel; Keil, Klaus; Love, Stanley J. (May 1999).

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The two largest imaged craters on Dactyl were named Acmon

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image of a 150 m (490 ft) block at 24.8°S, 2.8°E

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Asphaug, Erik; Ryan, Eileen V.; Zuber, Maria T. (2003).

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of 4.63 hours (roughly 5 hours). The calculated maximum

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asteroid mission, permitted the first study of asteroid

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This article is about an asteroid. For other uses, see

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Thomas, Peter C.; Prockter, Louise M. (28 May 2004).

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minutes before Galileo's closest approach on Aug. 28.

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trajectory from 19 October 1989 to 30 September 2003

194: 4502:

Belton, Michael J. S.; Carlson, R. (12 March 1994).

4198: 4158:"The internal structures and densities of asteroids" 3067: 3065: 3063: 2212: 2206: 2189: 2177: 1823:

100 million years ago, which reduced its size.

1752: 1498: 1492: 1480: 1425: 1419: 1410: 185: 125: 4757: 3893: 3787:Hurford, Terry A.; Greenberg, Richard (June 2000). 3167: 2788: 2745: 2405: 2359: 1755: 1743: 1723: 1714: 1693:Dactyl shares many characteristics with Ida. Their 1489: 1407: 1336:Highest-resolution image of Dactyl, recorded while 182: 119: 4767:33rd Annual Lunar and Planetary Science Conference 4538: 4290: 3110: 3108: 3003: 2762: 2729: 2727: 2586: 2584: 2582: 2514: 2512: 2510: 2508: 2506: 2504: 2502: 2489: 2487: 2485: 2477: 2452: 2450: 2448: 2446: 2444: 2442: 2440: 2438: 2357: 2355: 2353: 2351: 2349: 2347: 2345: 2343: 2341: 2339: 2245: 2243: 2241: 2239: 2161: 2159: 2157: 1909: 1785:Dactyl's orbit around Ida is not precisely known. 928:The Galileo images also led to the discovery that 4431:(Thesis). Massachusetts Institute of Technology. 3824:"Ejecta Blocks on 243 Ida and on Other Asteroids" 3060: 1833:List of geological features on 243 Ida and Dactyl 1288:. Ida takes 4.84089 years to complete one orbit. 657:was measured on 16 September 1980 by astronomers 5169: 3786: 3311: 3146: 3081: 3079: 3002: 2978: 2843: 2841: 1781:Diagram of potential orbits of Dactyl around Ida 746:of the asteroid at a resolution of 31–38 m/ 674:flyby from 78 to 60 km (48 to 37 mi). 4429:Spin-Axis Alignment of Koronis Family Asteroids 3875:Journal of the British Astronomical Association 3105: 2724: 2653: 2579: 2499: 2482: 2435: 2336: 2324: 2236: 2154: 2112: 2100: 2071: 2069: 2067: 2065: 1908: 1234:. Olivine and pyroxene were detected on Ida by 622:, a Viennese brewer and amateur astronomer. In 4541:"Solving for Dactyl's Orbit and Ida's Density" 4451: 4155: 3873:Mason, John W. (June 1994). "Ida's new moon". 2941: 2920: 2886: 2771: 2124: 2094: 1872:A Practical Dictionary of the English Language 1163:Ida's major craters are named after caves and 614:. It was his 45th asteroid discovery. Ida was 5046: 4861:National Aeronautics and Space Administration 4839:. Jet Propulsion Laboratory. 25 August 2008. 4501: 4297:. Cambridge, UK: Cambridge University Press. 4288: 4270:Carroll, Bradley W.; Ostlie, Dale A. (1996). 4269: 4243:. Cambridge, UK: Cambridge University Press. 3929:Owen, W. M. Jr.; Yeomans, D. K. (June 1994). 3397: 3076: 3071: 2990: 2838: 2820: 2306: 1962: 1680: 601: 4692:Holm, Jeanne (June 1994). Jones, Jan (ed.). 4289:Greeley, Ronald; Batson, Raymond M. (2001). 3717:Completing the Inventory of the Solar System 3120: 3096: 3094: 2892: 2620: 2618: 2616: 2062: 1028:3.5 minutes before its closest approach 5060: 4758:Sárneczky, K; Kereszturi, Á. (March 2002). 4609:. Vol. 147, no. 15. p. 207. 4585:. Vol. 144, no. 14. p. 215. 3928: 3443:"Asteroid Density, Porosity, and Structure" 3285:Celestial Mechanics and Dynamical Astronomy 2218: 2145: 2143: 2141: 2139: 1628:. It was discovered in images taken by the 956: 5053: 5039: 4974: 4881:"Gazetteer of Planetary Nomenclature: Ida" 4837:"JPL Small-Body Database Browser: 243 Ida" 4400:. IAU commission. Vol. 20. Springer. 4335: 4293:The Compact NASA Atlas of the Solar System 4240:Business and Politics in Europe, 1900–1970 3738:"Collisional and Dynamical History of Ida" 3126: 1893: 1891: 1889: 1887: 1885: 1883: 1881: 1879: 1855: 1853: 1340:was about 3,900 km away from the moon 1330: 32: 4736:Meeting on Asteroids and Comets in Europe 4655:Green, Daniel W. E. (26 September 1994). 4181: 4079: 3985: 3954: 3919: 3812: 3605: 3423: 3091: 2613: 1982: 1956: 1947: 1945: 1943: 1941: 1939: 4391: 3114: 2136: 2118: 2057:Vokrouhlicky, Nesvorny & Bottke 2003 1776: 1645:Dactyl was found on 17 February 1994 by 1263: 1154: 1094: 1019: 935: 888:flybys of Gaspra and Ida, and the later 642:. Ida was recognized as a member of the 5223:Astronomical objects discovered in 1884 5178:Minor planet object articles (numbered) 4914:, Robert Johnston, johnstonsarchive.net 4799:"Reflections on the Geology of 243 Ida" 4368: 3550: 3529: 3487: 3038:"The Argonautica" of Apollonius Rhodius 2805: 2803: 2794: 2659: 2590: 2518: 2493: 2456: 2363: 2330: 2249: 2165: 2106: 1876: 1850: 5170: 4891:from the original on 23 September 2006 4857:"Images of Asteroids Ida & Dactyl" 4796: 4426: 4272:An Introduction to Modern Astrophysics 4236: 3475:from the original on 17 September 2003 2947: 2733: 2130: 1936: 1604:200 K (−73 °C; −100 °F) 5034: 4657:"1993 (243) 1 = (243) Ida I (Dactyl)" 4654: 4597: 4580: 4427:Slivan, Stephen Michael (June 1995). 4356:from the original on 18 November 2019 4311: 4274:. Addison-Wesley Publishing Company. 3872: 3100: 3085: 2898: 2624: 2312: 1259: 566:Ida's orbit lies between the planets 328:Longitude of ascending node 4855: 4784:from the original on 26 January 2005 4726: 4691: 4679:from the original on 1 February 2019 4526:from the original on 1 February 2019 3024:participating institution membership 2800: 2783:Geissler, Petit & Greenberg 1996 2574:Geissler, Petit & Greenberg 1996 2418:Geissler, Petit & Greenberg 1996 2149: 2076:Archinal, Acton, A'Hearn et al. 2018 1930:participating institution membership 1897: 1859: 5203:Minor planets visited by spacecraft 4835: 4162:Meteoritics & Planetary Science 3338:from the original on 30 August 2021 3274: 1951: 1624:named Dactyl, official designation 1015: 984:Successive images of a rotating Ida 13: 4843:from the original on 7 August 2011 4806:Lunar and Planetary Science XXVIII 4760:"'Global' Tectonism on Asteroids?" 4183:10.1111/j.1945-5100.1999.tb01355.x 3702:from the original on 20 March 2009 3573:10.1111/j.1945-5100.1996.tb02107.x 2207:Zellner, Tholen & Tedesco 1985 2190:Zellner, Tholen & Tedesco 1985 2178:Zellner, Tholen & Tedesco 1985 1665:1993 (243) 1. It was named by the 1076:Ida's regolith is composed of the 700:. Its encounters of the asteroids 14: 5234: 4905: 4823:from the original on 4 March 2009 4414:from the original on 15 June 2024 4379:from the original on 15 June 2024 4257:from the original on 15 June 2024 3614:from the original on 11 June 2019 3385:from the original on 11 June 2019 1817: 664:US Naval Observatory in Flagstaff 5153: 5141: 5129: 5117: 5105: 4922:AstDyS-2, Asteroids—Dynamic Site 4879: 4863:. 23 August 2005. Archived from 4398:Dictionary of minor planet names 4143:from the original on 11 May 2008 3774:from the original on 5 June 2019 2809: 2289:D'Amario, Bright & Wolf 1992 2274:D'Amario, Bright & Wolf 1992 2262:D'Amario, Bright & Wolf 1992 2231:D'Amario, Bright & Wolf 1992 1739: 1710: 1667:International Astronomical Union 1476: 1403: 977: 965: 865: 853: 757: 682: 175: 115: 4887:Astrogeology Research Program. 4885:United States Geological Survey 4321:. Reading, MA: Addison-Wesley. 3030: 2996: 2865: 2853: 2826: 2776: 2746:Sárneczky & Kereszturi 2002 2183: 709:was launched into orbit by the 690:Ida was visited in 1993 by the 286:1,767.644 days (4.83955 a) 3147:Asphaug, Ryan & Zuber 2003 1902: 1864: 1669:in 1994, for the mythological 1201: 1032:Ida's surface appears heavily 879: 677: 1: 3269: 1138:a set opposite Vienna Regio. 1110: 1024:Mosaic of images recorded by 720:on 18 October 1989. Changing 559:spacecraft while en route to 5188:Discoveries by Johann Palisa 4369:Ridpath, John Clark (1897). 4221:10.1016/0019-1035(85)90133-2 3793:Geophysical Research Letters 2979:Hurford & Greenberg 2000 2887:Wilson, Keil & Love 1999 2095:Wilson, Keil & Love 1999 1640: 1069:observed evidence of recent 547:a nymph from Greek mythology 7: 4598:Cowen, Ron (1 April 1995). 4454:"Tectonics of Small Bodies" 4375:. Encyclopedia Publishing. 1826: 1658:made its closest approach. 1071:downslope regolith movement 1050: 884:The data returned from the 340:Argument of perihelion 48: 10: 5239: 4392:Schmadel, Lutz D. (2003). 3490:Asteroids, Comets, Meteors 2921:Thomas & Prockter 2004 2772:Thomas & Prockter 2004 2478:Byrnes & D'Amario 1994 1613: 1533:90 km at time of discovery 1141: 911:spectroscopic measurements 602:Discovery and observations 373:59.8 × 25.4 × 18.6 km 154:Minor planet category 18: 5213:S-type asteroids (Tholen) 5068: 4912:Asteroids with Satellites 3305:10.1007/s10569-017-9805-5 3175:"Planetary Names: Dactyl" 3072:Belton & Carlson 1994 3011:Oxford English Dictionary 2991:Carroll & Ostlie 1996 2821:Greeley & Batson 2001 1917:Oxford English Dictionary 1608: 1598: 1586: 1576: 1569: 1559: 1549: 1540:Orbital period (sidereal) 1537: 1525: 1518: 1468: 1456: 1444: 1398: 1386: 1381: 1373: 1360: 1350: 1345: 1329: 1319: 1310: 1206:Ida was classified as an 585:The images returned from 578:. It was named after the 516: 501: 487: 477: 465: 452: 437: 433:4.63 hours (0.193 d) 425: 412: 399: 389: 377: 367: 360: 349: 337: 325: 315: 303: 290: 281:Orbital period (sidereal) 278: 268: 252: 238: 224: 212: 205: 167: 151: 139: 110: 98: 93: 85: 73: 61: 56: 31: 5218:S-type asteroids (SMASS) 4494: 4229: 3935:The Astronomical Journal 3900:The Astronomical Journal 3036:Edward Coleridge (1990) 1843: 1772: 1681:Physical characteristics 1677:on the island of Crete. 1571:Physical characteristics 1459:Alternative designations 957:Physical characteristics 905:Ida is classified as an 504:Absolute magnitude 483:200 K (−73 °C) 362:Physical characteristics 5062:Minor planets navigator 4971:JPL Small-Body Database 4174:1999M&PS...34..479W 3565:1996M&PS...31..699C 3466:10.2307/j.ctv1v7zdn4.37 3016:Oxford University Press 2219:Owen & Yeomans 1994 1922:Oxford University Press 1589:Synodic rotation period 1520:Orbital characteristics 1272:Ida is a member of the 1000:the asteroid entirely. 940:Polished section of an 428:Synodic rotation period 207:Orbital characteristics 4935:Observation prediction 4797:Stooke, P. J. (1997). 4727:Raab, Herbert (2002). 4081:10.1006/icar.1996.0033 4032:10.1006/icar.1996.0041 3996:10.1006/icar.1997.5788 3851:10.1006/icar.1996.0039 3765:10.1006/icar.1996.0040 3693:10.1006/icar.1996.0042 3607:10.1006/icar.1996.0038 3425:10.1006/icar.1996.0032 3376:10.2307/j.ctv1v7zdn4.7 3134: 2911: 2321: 2197: 1808:Hubble Space Telescope 1782: 1269: 1160: 1103: 1029: 945: 909:based on ground-based 4720:6 August 2019 at the 4698:The Galileo Messenger 4545:The Galileo Messenger 4339:Description of Greece 3629:Space Science Reviews 3248:Greenberg et al. 1996 3177:. IAU. Archived from 3129: 3127:Pausanias & 5.7.6 2967:Greenberg et al. 1996 2902: 2316: 2193: 1838:List of minor planets 1780: 1661:Dactyl was initially 1267: 1158: 1098: 1023: 939: 668:Oak Ridge Observatory 395:4.2 ± 0.6 ×10 kg 4700:(34). Archived from 4547:(35). Archived from 4005:"Geology of 243 Ida" 3814:10.1029/1999GL010956 3314:"Asteroid Interiors" 2936:Sullivan et al. 1996 2872:Geissler et al. 1996 2860:Sullivan et al. 1996 2848:Sullivan et al. 1996 2757:Sullivan et al. 1996 2702:Sullivan et al. 1996 2687:Geissler et al. 1996 2543:Geissler et al. 1996 2301:Sullivan et al. 1996 1870:Noah Webster (1884) 1389:MPC designation 1293:retrograde direction 1171:, also known as the 416:surface gravity 260:2.861 AU (4.280 244:2.743 AU (4.103 230:2.979 AU (4.457 101:MPC designation 21:Ida (disambiguation) 5193:Named minor planets 5022:Physical parameters 4814:1997LPI....28.1385S 4775:2002LPI....33.1381S 4673:1994IAUC.6082....2G 4648:1994LPI....25..469G 4574:1994LPI....25..237C 4520:1994IAUC.5948....2B 4461:Planetary Tectonics 4213:1985Icar...61..355Z 4118:10.1038/nature01948 4110:2003Natur.425..147V 4072:1996Icar..120...20T 4024:1996Icar..120..119S 3978:1997Icar..130..177P 3947:1994AJ....107.2295O 3912:1994AJ....107.2290M 3887:1994JBAA..104..108M 3843:1996Icar..120...87L 3805:2000GeoRL..27.1595H 3757:1996Icar..120..106G 3729:1996ASPC..107...57G 3685:1996Icar..120..140G 3641:1992SSRv...60...23D 3598:1996Icar..120...77C 3544:1995Metic..30R.496C 3523:1994Metic..29..455C 3502:1994IAUS..160..357C 3458:2002aste.book..485B 3416:1996Icar..120....1B 3368:2002aste.book....3B 3329:2002aste.book..463A 3297:2018CeMDA.130...22A 3162:Chapman et al. 1994 3014:(Online ed.). 2648:Greeley et al. 1994 2430:Chapman et al. 1994 2394:Greeley et al. 1994 2379:Chapman et al. 1994 2180:, pp. 357, 373 2003:1995Natur.374..785B 1920:(Online ed.). 1374:Discovery date 1362:Discovery site 1326: 1291:Ida rotates in the 993:gravitational field 694:-bound space probe 655:reflection spectrum 638:who raised the god 408:2.6 ± 0.5 g/cm 146:Ida (nurse of Zeus) 86:Discovery date 75:Discovery site 28: 4959:Observational info 4867:on 21 October 2008 4745:on 30 October 2008 4336:Pausanias (1916). 4056:"The shape of Ida" 3649:10.1007/BF00216849 3582:"Cratering on Ida" 2833:Bottke et al. 2002 2797:, pp. 707–708 2608:Bottke et al. 2002 2533:, pp. 179–180 2078:, p. 6, 15–16 2041:Thomas et al. 1996 1963:Belton et al. 1996 1783: 1626:(243) Ida I Dactyl 1545:prograde, ca. 20 h 1394:(243) Ida I Dactyl 1352:Discovered by 1324: 1270: 1260:Orbit and rotation 1212:ordinary chondrite 1161: 1104: 1030: 946: 942:ordinary chondrite 919:ordinary chondrite 648:Kiyotsugu Hirayama 612:Vienna Observatory 596:ordinary chondrite 543:Vienna Observatory 89:September 29, 1884 80:Vienna Observatory 63:Discovered by 43:image of 243 Ida. 26: 16:Main-belt asteroid 5183:Koronis asteroids 5093: 5092: 4551:on 5 January 1997 4470:978-0-521-76573-2 4407:978-3-540-00238-3 4349:978-0-674-99104-0 4328:978-0-201-47959-1 4304:978-0-521-80633-6 4281:978-0-201-54730-6 4250:978-0-521-82344-9 4104:(6954): 147–151. 3799:(11): 1595–1598. 3260:Petit et al. 1997 3236:Petit et al. 1997 3224:Petit et al. 1997 3212:Petit et al. 1997 3200:Petit et al. 1997 3055:Petit et al. 1997 3022:(Subscription or 2531:Petit et al. 1997 2406:Monet et al. 1994 1997:(6525): 785–788. 1977:Britt et al. 2002 1928:(Subscription or 1612: 1611: 1561:Satellite of 1301:moment of inertia 740:high-gain antenna 620:Moriz von Kuffner 520: 519: 421:0.3–1.1 cm/s 5230: 5198:Binary asteroids 5158: 5157: 5156: 5146: 5145: 5144: 5134: 5133: 5132: 5122: 5121: 5110: 5109: 5108: 5101: 5055: 5048: 5041: 5032: 5031: 5014:Orbital elements 4978: 4900: 4898: 4896: 4876: 4874: 4872: 4852: 4850: 4848: 4832: 4830: 4828: 4822: 4803: 4793: 4791: 4789: 4783: 4764: 4754: 4752: 4750: 4744: 4738:. Archived from 4733: 4713: 4711: 4709: 4688: 4686: 4684: 4651: 4633: 4631: 4629: 4624:on 27 March 2012 4623: 4617:. Archived from 4604: 4594: 4577: 4560: 4558: 4556: 4535: 4533: 4531: 4489: 4487: 4485: 4479: 4473:. Archived from 4458: 4448: 4423: 4421: 4419: 4388: 4386: 4384: 4365: 4363: 4361: 4332: 4308: 4296: 4285: 4266: 4264: 4262: 4224: 4195: 4185: 4152: 4150: 4148: 4142: 4095: 4085: 4083: 4050: 4048: 4046: 4040: 4034:. Archived from 4009: 3999: 3989: 3960: 3958: 3941:(6): 2295–2298. 3925: 3923: 3906:(6): 2290–2294. 3890: 3869: 3867: 3865: 3859: 3853:. Archived from 3828: 3818: 3816: 3783: 3781: 3779: 3773: 3742: 3732: 3711: 3709: 3707: 3701: 3670: 3660: 3623: 3621: 3619: 3609: 3576: 3547: 3526: 3505: 3484: 3482: 3480: 3474: 3447: 3437: 3427: 3394: 3392: 3390: 3384: 3357: 3347: 3345: 3343: 3337: 3318: 3308: 3275:Journal articles 3263: 3257: 3251: 3245: 3239: 3233: 3227: 3221: 3215: 3209: 3203: 3197: 3191: 3190: 3188: 3186: 3171: 3165: 3159: 3150: 3144: 3135: 3124: 3118: 3112: 3103: 3098: 3089: 3083: 3074: 3069: 3058: 3052: 3041: 3034: 3028: 3027: 3019: 3007: 3000: 2994: 2988: 2982: 2976: 2970: 2964: 2951: 2945: 2939: 2933: 2924: 2918: 2912: 2896: 2890: 2884: 2875: 2869: 2863: 2857: 2851: 2845: 2836: 2830: 2824: 2818: 2812: 2807: 2798: 2792: 2786: 2785:, pp. 57–58 2780: 2774: 2769: 2760: 2754: 2748: 2743: 2737: 2731: 2722: 2716: 2705: 2699: 2690: 2684: 2675: 2669: 2663: 2657: 2651: 2645: 2639: 2633: 2627: 2622: 2611: 2605: 2594: 2588: 2577: 2571: 2558: 2552: 2546: 2540: 2534: 2528: 2522: 2516: 2497: 2491: 2480: 2475: 2460: 2454: 2433: 2427: 2421: 2415: 2409: 2403: 2397: 2391: 2382: 2376: 2367: 2361: 2334: 2328: 2322: 2310: 2304: 2298: 2292: 2286: 2277: 2271: 2265: 2259: 2253: 2247: 2234: 2228: 2222: 2216: 2210: 2204: 2198: 2187: 2181: 2175: 2169: 2163: 2152: 2147: 2134: 2128: 2122: 2116: 2110: 2104: 2098: 2092: 2079: 2073: 2060: 2054: 2043: 2038: 2023: 2022: 2011:10.1038/374785a0 1986: 1980: 1974: 1965: 1960: 1954: 1949: 1934: 1933: 1925: 1913: 1906: 1900: 1895: 1874: 1868: 1862: 1857: 1768: 1767: 1764: 1763: 1760: 1757: 1754: 1751: 1748: 1745: 1736: 1735: 1732: 1731: 1728: 1725: 1722: 1719: 1716: 1514: 1513: 1510: 1509: 1506: 1503: 1500: 1497: 1494: 1491: 1488: 1485: 1482: 1437: 1432: 1431: 1428: 1427: 1424: 1421: 1418: 1415: 1412: 1409: 1377:17 February 1994 1334: 1327: 1323: 1090:space weathering 1016:Surface features 981: 969: 930:space weathering 869: 857: 848: 846: 837: 832: 823: 818: 809: 804: 795: 790: 781: 776: 770: 761: 545:and named after 468:Geometric albedo 454:North pole 444: 439:North pole 263: 247: 233: 201: 200: 197: 196: 193: 190: 187: 184: 181: 135: 134: 131: 130: 127: 124: 121: 36: 29: 25: 5238: 5237: 5233: 5232: 5231: 5229: 5228: 5227: 5208:Galileo program 5168: 5167: 5164: 5154: 5152: 5142: 5140: 5130: 5128: 5116: 5106: 5104: 5096: 5094: 5089: 5064: 5059: 4951:Proper elements 4908: 4903: 4894: 4892: 4870: 4868: 4846: 4844: 4826: 4824: 4820: 4801: 4787: 4785: 4781: 4762: 4748: 4746: 4742: 4731: 4722:Wayback Machine 4707: 4705: 4704:on 24 June 2010 4682: 4680: 4627: 4625: 4621: 4602: 4554: 4552: 4529: 4527: 4497: 4492: 4483: 4481: 4480:on 4 March 2009 4477: 4471: 4456: 4417: 4415: 4408: 4382: 4380: 4359: 4357: 4350: 4329: 4305: 4282: 4260: 4258: 4251: 4232: 4227: 4146: 4144: 4140: 4093: 4044: 4042: 4041:on 12 June 2016 4038: 4007: 3987:10.1.1.693.8814 3863: 3861: 3860:on 12 June 2016 3857: 3826: 3777: 3775: 3771: 3740: 3705: 3703: 3699: 3668: 3617: 3615: 3478: 3476: 3472: 3445: 3388: 3386: 3382: 3355: 3341: 3339: 3335: 3316: 3277: 3272: 3267: 3266: 3258: 3254: 3246: 3242: 3234: 3230: 3222: 3218: 3210: 3206: 3198: 3194: 3184: 3182: 3173: 3172: 3168: 3160: 3153: 3145: 3138: 3125: 3121: 3113: 3106: 3099: 3092: 3084: 3077: 3070: 3061: 3053: 3044: 3035: 3031: 3021: 3001: 2997: 2989: 2985: 2977: 2973: 2965: 2954: 2946: 2942: 2934: 2927: 2919: 2915: 2897: 2893: 2885: 2878: 2870: 2866: 2858: 2854: 2846: 2839: 2831: 2827: 2819: 2815: 2808: 2801: 2793: 2789: 2781: 2777: 2770: 2763: 2755: 2751: 2744: 2740: 2732: 2725: 2719:Lee et al. 1996 2717: 2708: 2700: 2693: 2685: 2678: 2672:Lee et al. 1996 2670: 2666: 2658: 2654: 2646: 2642: 2636:Lee et al. 1996 2634: 2630: 2623: 2614: 2606: 2597: 2589: 2580: 2572: 2561: 2555:Lee et al. 1996 2553: 2549: 2541: 2537: 2529: 2525: 2517: 2500: 2492: 2483: 2476: 2463: 2455: 2436: 2428: 2424: 2416: 2412: 2404: 2400: 2392: 2385: 2377: 2370: 2362: 2337: 2329: 2325: 2311: 2307: 2299: 2295: 2287: 2280: 2272: 2268: 2260: 2256: 2248: 2237: 2229: 2225: 2217: 2213: 2205: 2201: 2188: 2184: 2176: 2172: 2164: 2155: 2148: 2137: 2129: 2125: 2117: 2113: 2105: 2101: 2093: 2082: 2074: 2063: 2055: 2046: 2039: 2026: 1987: 1983: 1975: 1968: 1961: 1957: 1950: 1937: 1927: 1907: 1903: 1896: 1877: 1869: 1865: 1858: 1851: 1846: 1829: 1820: 1775: 1742: 1738: 1713: 1709: 1697:and reflection 1683: 1643: 1618: 1591: 1542: 1530: 1528:Semi-major axis 1479: 1475: 1461: 1447: 1435: 1406: 1402: 1391: 1341: 1322: 1313: 1297:rotation period 1262: 1208:S-type asteroid 1204: 1196:Ejecta blankets 1144: 1128:Townsend Dorsum 1113: 1053: 1018: 989: 988: 987: 986: 985: 982: 974: 973: 970: 959: 907:S-type asteroid 882: 877: 876: 875: 874: 873: 870: 862: 861: 858: 850: 849: 844: 843: 830: 829: 816: 815: 802: 801: 788: 787: 774: 773: 772: 768: 762: 688: 680: 659:David J. Tholen 624:Greek mythology 604: 551:S-type asteroid 509: 492: 470: 458: 445: 442:right ascension 440: 430: 418: 405: 382: 342: 330: 308: 296: 283: 261: 257: 255:Semi-major axis 245: 231: 178: 174: 156: 142: 118: 114: 103: 52: 24: 17: 12: 11: 5: 5236: 5226: 5225: 5220: 5215: 5210: 5205: 5200: 5195: 5190: 5185: 5180: 5163: 5162: 5150: 5138: 5126: 5114: 5091: 5090: 5088: 5087: 5082: 5075: 5073:242 Kriemhild 5069: 5066: 5065: 5058: 5057: 5050: 5043: 5035: 5027: 5026: 5025: 5024: 4982:Close approach 4963: 4962: 4961: 4915: 4907: 4906:External links 4904: 4902: 4901: 4877: 4853: 4833: 4794: 4755: 4724: 4689: 4652: 4634: 4595: 4578: 4561: 4536: 4504:"1993 (243) 1" 4498: 4496: 4493: 4491: 4490: 4469: 4449: 4424: 4406: 4389: 4366: 4348: 4333: 4327: 4313:Lewis, John S. 4309: 4303: 4286: 4280: 4267: 4249: 4233: 4231: 4228: 4226: 4225: 4207:(3): 355–416. 4196: 4168:(3): 479–483. 4153: 4086: 4051: 4018:(1): 119–139. 4000: 3972:(1): 177–197. 3961: 3956:10.1086/117037 3926: 3921:10.1086/117036 3891: 3870: 3819: 3784: 3751:(1): 106–118. 3733: 3712: 3679:(1): 140–157. 3661: 3635:(1–4): 23–78. 3624: 3577: 3559:(6): 699–725. 3548: 3527: 3506: 3485: 3438: 3395: 3348: 3309: 3278: 3276: 3273: 3271: 3268: 3265: 3264: 3252: 3240: 3228: 3216: 3204: 3192: 3181:on 1 July 2015 3166: 3151: 3136: 3119: 3104: 3090: 3075: 3059: 3042: 3029: 2995: 2983: 2981:, p. 1595 2971: 2952: 2940: 2925: 2913: 2891: 2876: 2864: 2852: 2837: 2825: 2813: 2799: 2787: 2775: 2761: 2749: 2738: 2736:, p. 1385 2723: 2706: 2691: 2676: 2664: 2652: 2640: 2628: 2612: 2595: 2578: 2559: 2547: 2535: 2523: 2498: 2481: 2461: 2434: 2422: 2410: 2408:, p. 2293 2398: 2383: 2368: 2335: 2323: 2315:, p. 215 2305: 2293: 2278: 2266: 2254: 2235: 2223: 2221:, p. 2295 2211: 2199: 2192:, p. 404 2182: 2170: 2153: 2135: 2123: 2111: 2099: 2080: 2061: 2044: 2024: 1981: 1966: 1955: 1935: 1901: 1875: 1863: 1848: 1847: 1845: 1842: 1841: 1840: 1835: 1828: 1825: 1819: 1818:Age and origin 1816: 1774: 1771: 1682: 1679: 1673:who inhabited 1642: 1639: 1635:prograde orbit 1614:Main article: 1610: 1609: 1606: 1605: 1602: 1596: 1595: 1592: 1587: 1584: 1583: 1582:1.6×1.4×1.2 km 1580: 1574: 1573: 1567: 1566: 1563: 1557: 1556: 1553: 1547: 1546: 1543: 1538: 1535: 1534: 1531: 1526: 1523: 1522: 1516: 1515: 1472: 1466: 1465: 1462: 1457: 1454: 1453: 1448: 1445: 1442: 1441: 1400: 1396: 1395: 1392: 1387: 1384: 1383: 1379: 1378: 1375: 1371: 1370: 1364: 1358: 1357: 1354: 1348: 1347: 1343: 1342: 1335: 1321: 1318: 1312: 1309: 1274:Koronis family 1261: 1258: 1203: 1200: 1184:prime meridian 1149:Koronis family 1143: 1140: 1112: 1109: 1052: 1049: 1017: 1014: 983: 976: 975: 971: 964: 963: 962: 961: 960: 958: 955: 891:NEAR Shoemaker 881: 878: 871: 864: 863: 859: 852: 851: 763: 756: 755: 754: 753: 752: 711:Space Shuttle 687: 681: 679: 676: 644:Koronis family 603: 600: 531:Koronis family 518: 517: 514: 513: 510: 502: 499: 498: 493: 488: 485: 484: 481: 475: 474: 471: 466: 463: 462: 459: 453: 450: 449: 446: 438: 435: 434: 431: 426: 423: 422: 419: 413: 410: 409: 406: 400: 397: 396: 393: 387: 386: 383: 378: 375: 374: 371: 365: 364: 358: 357: 354: 347: 346: 343: 338: 335: 334: 331: 326: 323: 322: 319: 313: 312: 309: 304: 301: 300: 297: 291: 288: 287: 284: 279: 276: 275: 272: 266: 265: 258: 253: 250: 249: 242: 236: 235: 228: 222: 221: 216:31 July 2016 ( 210: 209: 203: 202: 173:Idean (Idæan) 171: 165: 164: 161:Koronis family 157: 152: 149: 148: 143: 140: 137: 136: 112: 108: 107: 104: 99: 96: 95: 91: 90: 87: 83: 82: 77: 71: 70: 65: 59: 58: 54: 53: 37: 15: 9: 6: 4: 3: 2: 5235: 5224: 5221: 5219: 5216: 5214: 5211: 5209: 5206: 5204: 5201: 5199: 5196: 5194: 5191: 5189: 5186: 5184: 5181: 5179: 5176: 5175: 5173: 5166: 5161: 5151: 5149: 5139: 5137: 5127: 5125: 5120: 5115: 5113: 5103: 5102: 5099: 5086: 5083: 5081: 5080: 5076: 5074: 5071: 5070: 5067: 5063: 5056: 5051: 5049: 5044: 5042: 5037: 5036: 5033: 5029: 5023: 5019: 5015: 5011: 5007: 5006:Orbit diagram 5003: 4999: 4995: 4991: 4987: 4983: 4980: 4979: 4977: 4973: 4972: 4967: 4964: 4960: 4956: 4952: 4948: 4944: 4940: 4936: 4932: 4928: 4925: 4924: 4923: 4919: 4916: 4913: 4910: 4909: 4890: 4886: 4882: 4878: 4866: 4862: 4858: 4854: 4842: 4838: 4834: 4819: 4815: 4811: 4808:: 1385–1386. 4807: 4800: 4795: 4780: 4776: 4772: 4768: 4761: 4756: 4741: 4737: 4730: 4725: 4723: 4719: 4716: 4703: 4699: 4695: 4690: 4678: 4674: 4670: 4666: 4662: 4658: 4653: 4649: 4645: 4641: 4635: 4620: 4616: 4612: 4608: 4601: 4596: 4592: 4588: 4584: 4579: 4575: 4571: 4567: 4562: 4550: 4546: 4542: 4537: 4525: 4521: 4517: 4513: 4509: 4505: 4500: 4499: 4476: 4472: 4466: 4462: 4455: 4450: 4446: 4442: 4438: 4434: 4430: 4425: 4413: 4409: 4403: 4399: 4395: 4390: 4378: 4374: 4373: 4367: 4355: 4351: 4345: 4341: 4340: 4334: 4330: 4324: 4320: 4319: 4314: 4310: 4306: 4300: 4295: 4294: 4287: 4283: 4277: 4273: 4268: 4256: 4252: 4246: 4242: 4241: 4235: 4234: 4222: 4218: 4214: 4210: 4206: 4202: 4197: 4193: 4189: 4184: 4179: 4175: 4171: 4167: 4163: 4159: 4154: 4139: 4135: 4131: 4127: 4123: 4119: 4115: 4111: 4107: 4103: 4099: 4092: 4087: 4082: 4077: 4073: 4069: 4065: 4061: 4057: 4052: 4037: 4033: 4029: 4025: 4021: 4017: 4013: 4006: 4001: 3997: 3993: 3988: 3983: 3979: 3975: 3971: 3967: 3962: 3957: 3952: 3948: 3944: 3940: 3936: 3932: 3927: 3922: 3917: 3913: 3909: 3905: 3901: 3897: 3892: 3888: 3884: 3880: 3876: 3871: 3856: 3852: 3848: 3844: 3840: 3837:(1): 87–105. 3836: 3832: 3825: 3820: 3815: 3810: 3806: 3802: 3798: 3794: 3790: 3785: 3770: 3766: 3762: 3758: 3754: 3750: 3746: 3739: 3734: 3730: 3726: 3722: 3718: 3713: 3698: 3694: 3690: 3686: 3682: 3678: 3674: 3667: 3662: 3658: 3654: 3650: 3646: 3642: 3638: 3634: 3630: 3625: 3613: 3608: 3603: 3599: 3595: 3591: 3587: 3583: 3578: 3574: 3570: 3566: 3562: 3558: 3554: 3549: 3545: 3541: 3537: 3533: 3528: 3524: 3520: 3516: 3512: 3507: 3503: 3499: 3495: 3491: 3486: 3471: 3467: 3463: 3459: 3455: 3451: 3450:Asteroids III 3444: 3439: 3435: 3431: 3426: 3421: 3417: 3413: 3409: 3405: 3401: 3396: 3381: 3377: 3373: 3369: 3365: 3361: 3360:Asteroids III 3354: 3349: 3334: 3330: 3326: 3322: 3321:Asteroids III 3315: 3310: 3306: 3302: 3298: 3294: 3290: 3286: 3280: 3279: 3262:, p. 182 3261: 3256: 3250:, p. 116 3249: 3244: 3238:, p. 193 3237: 3232: 3226:, p. 188 3225: 3220: 3214:, p. 195 3213: 3208: 3202:, p. 179 3201: 3196: 3180: 3176: 3170: 3164:, p. 455 3163: 3158: 3156: 3149:, p. 463 3148: 3143: 3141: 3133: 3128: 3123: 3116: 3115:Schmadel 2003 3111: 3109: 3102: 3097: 3095: 3088:, p. 108 3087: 3082: 3080: 3073: 3068: 3066: 3064: 3057:, p. 177 3056: 3051: 3049: 3047: 3039: 3033: 3025: 3017: 3013: 3012: 3006: 2999: 2993:, p. 878 2992: 2987: 2980: 2975: 2969:, p. 117 2968: 2963: 2961: 2959: 2957: 2950:, p. 134 2949: 2944: 2938:, p. 135 2937: 2932: 2930: 2922: 2917: 2910: 2908: 2901:, p. 89 2900: 2895: 2889:, p. 480 2888: 2883: 2881: 2874:, p. 155 2873: 2868: 2862:, p. 128 2861: 2856: 2850:, p. 124 2849: 2844: 2842: 2834: 2829: 2823:, p. 393 2822: 2817: 2811: 2806: 2804: 2796: 2791: 2784: 2779: 2773: 2768: 2766: 2759:, p. 131 2758: 2753: 2747: 2742: 2735: 2730: 2728: 2720: 2715: 2713: 2711: 2704:, p. 132 2703: 2698: 2696: 2689:, p. 141 2688: 2683: 2681: 2673: 2668: 2662:, p. 701 2661: 2656: 2650:, p. 470 2649: 2644: 2637: 2632: 2626: 2621: 2619: 2617: 2609: 2604: 2602: 2600: 2593:, p. 363 2592: 2587: 2585: 2583: 2575: 2570: 2568: 2566: 2564: 2556: 2551: 2545:, p. 142 2544: 2539: 2532: 2527: 2521:, p. 496 2520: 2515: 2513: 2511: 2509: 2507: 2505: 2503: 2496:, p. 710 2495: 2490: 2488: 2486: 2479: 2474: 2472: 2470: 2468: 2466: 2459:, p. 709 2458: 2453: 2451: 2449: 2447: 2445: 2443: 2441: 2439: 2432:, p. 238 2431: 2426: 2419: 2414: 2407: 2402: 2396:, p. 469 2395: 2390: 2388: 2381:, p. 237 2380: 2375: 2373: 2366:, p. 707 2365: 2360: 2358: 2356: 2354: 2352: 2350: 2348: 2346: 2344: 2342: 2340: 2333:, p. 358 2332: 2327: 2320: 2314: 2309: 2303:, p. 120 2302: 2297: 2290: 2285: 2283: 2275: 2270: 2263: 2258: 2252:, p. 699 2251: 2246: 2244: 2242: 2240: 2232: 2227: 2220: 2215: 2209:, p. 410 2208: 2203: 2196: 2191: 2186: 2179: 2174: 2168:, p. 700 2167: 2162: 2160: 2158: 2151: 2146: 2144: 2142: 2140: 2133:, p. 241 2132: 2127: 2120: 2119:Schmadel 2003 2115: 2109:, p. 206 2108: 2103: 2097:, p. 479 2096: 2091: 2089: 2087: 2085: 2077: 2072: 2070: 2068: 2066: 2059:, p. 147 2058: 2053: 2051: 2049: 2042: 2037: 2035: 2033: 2031: 2029: 2020: 2016: 2012: 2008: 2004: 2000: 1996: 1992: 1985: 1979:, p. 486 1978: 1973: 1971: 1964: 1959: 1953: 1948: 1946: 1944: 1942: 1940: 1931: 1923: 1919: 1918: 1912: 1905: 1899: 1894: 1892: 1890: 1888: 1886: 1884: 1882: 1880: 1873: 1867: 1861: 1856: 1854: 1849: 1839: 1836: 1834: 1831: 1830: 1824: 1815: 1811: 1809: 1805: 1800: 1796: 1792: 1788: 1779: 1770: 1766: 1734: 1706: 1704: 1700: 1696: 1691: 1689: 1678: 1676: 1672: 1668: 1664: 1659: 1657: 1652: 1648: 1638: 1636: 1631: 1627: 1623: 1617: 1616:Dactyl (moon) 1607: 1603: 1601: 1597: 1593: 1590: 1585: 1581: 1579: 1575: 1572: 1568: 1564: 1562: 1558: 1554: 1552: 1548: 1544: 1541: 1536: 1532: 1529: 1524: 1521: 1517: 1512: 1473: 1471: 1467: 1463: 1460: 1455: 1452: 1449: 1443: 1440: 1439: 1430: 1401: 1399:Pronunciation 1397: 1393: 1390: 1385: 1380: 1376: 1372: 1368: 1365: 1363: 1359: 1355: 1353: 1349: 1344: 1339: 1333: 1328: 1317: 1308: 1306: 1302: 1298: 1294: 1289: 1287: 1283: 1279: 1278:asteroid-belt 1275: 1266: 1257: 1255: 1254: 1248: 1246: 1241: 1237: 1233: 1229: 1225: 1221: 1217: 1213: 1209: 1199: 1197: 1193: 1187: 1185: 1180: 1176: 1175: 1170: 1166: 1157: 1153: 1150: 1139: 1135: 1133: 1129: 1124: 1122: 1118: 1108: 1101: 1097: 1093: 1091: 1087: 1083: 1079: 1074: 1072: 1068: 1064: 1063:impact events 1060: 1059: 1048: 1046: 1045: 1044:ejecta blocks 1040: 1035: 1027: 1022: 1013: 1011: 1007: 1001: 999: 994: 980: 968: 954: 952: 943: 938: 934: 931: 926: 924: 920: 916: 912: 908: 903: 901: 897: 893: 892: 887: 868: 856: 847: 243 Ida 841: 836: 827: 822: 813: 808: 799: 794: 785: 780: 767: 764:Animation of 760: 751: 749: 745: 741: 736: 733: 729: 727: 723: 719: 715: 714: 708: 703: 699: 698: 693: 685: 675: 673: 669: 665: 660: 656: 651: 649: 645: 641: 637: 633: 629: 625: 621: 617: 613: 609: 608:Johann Palisa 599: 597: 592: 588: 583: 581: 577: 572: 569: 564: 562: 558: 557: 552: 548: 544: 540: 539:Johann Palisa 536: 535:asteroid belt 532: 528: 524: 515: 511: 508: 507: 500: 497: 494: 491: 490:Spectral type 486: 482: 480: 476: 472: 469: 464: 460: 457: 451: 447: 443: 436: 432: 429: 424: 420: 417: 411: 407: 404: 398: 394: 392: 388: 384: 381: 376: 372: 370: 366: 363: 359: 355: 353: 348: 344: 341: 336: 332: 329: 324: 320: 318: 314: 310: 307: 302: 298: 295: 294:orbital speed 289: 285: 282: 277: 273: 271: 267: 259: 256: 251: 243: 241: 237: 229: 227: 223: 219: 215: 211: 208: 204: 199: 172: 170: 166: 162: 158: 155: 150: 147: 144: 138: 133: 113: 111:Pronunciation 109: 105: 102: 97: 92: 88: 84: 81: 78: 76: 72: 69: 68:Johann Palisa 66: 64: 60: 55: 50: 46: 42: 41: 35: 30: 22: 5165: 5160:Solar System 5077: 5028: 5017: 5009: 5001: 4993: 4985: 4969: 4954: 4946: 4943:Orbital info 4938: 4930: 4921: 4893:. 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