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951 Gaspra

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resolution of the issue may be that Gaspra obtained a regolith during the Flora-family forming impact that also created Gaspra itself. Secondly, it has been estimated that the matter ejected by all the craters would be only enough to cover Gaspra with 10 m of regolith. However, some craters are much deeper than this without showing any structural difference on their walls.
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Grooves about 100 m (330 ft) to 300 m (980 ft) wide, up to 2.5 km (1.6 mi) long, and tens of meters deep are seen on Gaspra's surface, which may be related to Gaspra's formation along with the rest of the Flora family in an asteroid collision. Their presence also suggest
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Apart from a multitude of small craters, Gaspra has half a dozen large flat areas and concavities. One of these flat areas, Dunne Regio, is a 5 km × 7 km (3.1 mi × 4.3 mi) area that is flat to within 200 m (660 ft). It is uncertain whether these are the result
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is very small, so small that it is difficult to understand how it could keep a significant portion of fragments ejected by impacts from escaping. This may be alleviated if Gaspra is a porous body or started with a large regolith, but one has to explain how the original regolith appeared. A possible
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The extensiveness of regolith on Gaspra and its presence overall is a matter of debate, and not fully understood. Visually, the somewhat subdued and mantled appearance suggests a substantial regolith. Also, correlations are seen between the subtle color variations and local topography, and it has
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flew by Gaspra on 29 October 1991, passing within 1,600 km (990 mi) at a relative speed of about 8 km/s (18,000 mph). 57 images were returned to Earth, the closest taken from a distance of 5,300 km (3,300 mi). The best images have a resolution of about 54 meters per
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and Gaspra was relatively recent on an astronomical timescale, so that Gaspra has not yet had the opportunity to acquire many large craters since. Analysis of cratering rates suggests the age of the surface is between about 20 to 300 million years. It was suggested in 2007 that the fresh, steep
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spacecraft team to reduce the uncertainty of Gaspra's position using images captured during the approach to Gaspra. This was successful and allowed the spacecraft to obtain images from as close as 5,300 km (3,300 mi). At this closest range, the pointing was still not known accurately
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would not know where to point to capture images of the asteroid once it was closer than 70,000 km (43,000 mi). This would render the encounter not very interesting scientifically. To overcome this problem, a pioneering
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that it is a single coherent body, rather than a rubble pile. The grooves were likely created by impacts that shattered the underlying rock. A system of much more prominent grooves is seen on the Martian moon
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Davies, M. E., T. R. Colvin, M.J.S. Belton, J. Veverka, and P. C. Thomas, "The Direction of the North Pole and the Control Network of Asteroid 951 Gaspra," Icarus, Vol. 107, pp. 18–22, 1994.
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of 72°. The Galileo flyby was too distant for a body of Gaspra's small size to noticeably affect Galileo's trajectory, so no information on Gaspra's mass was obtained. (Galileo also visited
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Bottke, W. F.; Vokrouhlický, D.; Chapman, C. R.; Nesvorny, D. (March 2007), "Gaspra's Steep Crater Population Was Produced by a Large Recent Breakup in the Main Asteroid Belt",
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been suggested that this is caused by the slow migration of regolith to lower areas. It is, however, difficult to explain the origin of a putative regolith. Firstly, Gaspra's
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Because Gaspra's position was only known to within about 200 km (120 mi) before the encounter, and the camera's field of view was only about 5° across,
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would naturally take on such flat, lopsided shapes, making this determination difficult. The flat facets and concavities give Gaspra a very angular appearance.
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pixel (177.16 ft). The area around the southern pole was not seen during the flyby, but the remaining 80% of the asteroid was imaged.
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in the proportions 4:1 to 7:1). There are no prominent albedo or color patterns, although a subtle color variation is seen across the surface.
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Gaspra orbits the Sun at an average distance of about 2.21 astronomical units. Gaspra completes one orbit around the Sun in 3.29 years.
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of impacts or whether they are instead facets formed when Gaspra broke off its parent asteroid. In the weak, lopsided
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Gaspra's surface lacks unambiguous craters of a size comparable to its radius, like those seen for example on
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Gaspra's surface area has been calculated at about 525 km, which, for comparison, is about the size of
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M.J.S. Belton; et al. (1992). "Galileo Encounter with 951 Gaspra: First Pictures of an Asteroid".
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Abstracts of the 25th Lunar and Planetary Science Conference, Held in Houston, TX, 14–18 March 1994
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Domingue, D. L.; Faith, V.; Choo, T.; Stockstill-Cahill, K. R.; et al. (December 2016).
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enough, but the camera took a 51 image mosaic so as to capture Gaspra on at least one image.
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Gaspra was the first asteroid ever to be closely approached when it was visited by the
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P. C. Thomas; J. Veverka; D. Simonelli; P. Helfenstein; et al. (1994).
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Gaspra's rotational axis has been determined to point in the direction of
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where it discovered a moon, allowing a mass estimate there.)
26: 1207:"A Galileo Multi Spectral Instrument Analysis of 951 Gaspra" 672:. A probable reason is that the collision that produced the 994:"Asteroid 951 Gaspra – Nesvorny HCM Asteroid Families V3.0" 611: 447: 403: 120: 1234:
Veverka, J.; Belton, M.; Klaasen, K.; Chapman, C. (1994).
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retreat that was visited by his contemporaries, such as
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J.C. Granahan; F.P. Fanale & M.S. Robinson (1994).
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Gaspra orbits the Sun just outside of the orbit of Mars
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"(951) Gaspra". 908: 25: 16:S-type asteroid in the inner asteroid belt 1325: 1259: 1220: 1198: 1050: 928: 906: 904: 902: 900: 898: 896: 894: 892: 890: 888: 648:List of geological features on 951 Gaspra 392:18.2 km × 10.5 km × 8.9 km 1293: 1059: 959: 760: 719: 709: 651: 586:spacecraft, which flew by on its way to 1874:Astronomical objects discovered in 1916 1834:Minor planet object articles (numbered) 1101: 1011: 953: 34:image of Gaspra; colors are exaggerated 1826: 1279:Lunar and Planetary Science Conference 1161: 1155: 885: 714:Successive images of a rotating Gaspra 681:-forming event that happened near it. 1550: 1485: 986: 705: 677:craters on Gaspra were formed by the 357:Longitude of ascending node 1854:Minor planets visited by spacecraft 656:Gaspra (top) and the Martian moons 641: 13: 1364:Gaspra in approximately true color 14: 1885: 1346: 745:(β, λ) = (21°, 20°) and gives an 1373:AstDyS-2, Asteroids—Dynamic Site 871:campaign was implemented by the 561:in 1916. Neujmin named it after 98: 1334: 1282:, no. 1338, p. 2165, 1268: 1844:Discoveries by Grigory Neujmin 756: 621: 1: 1133:10.1126/science.257.5077.1647 970:10.1007/978-3-540-29925-7_952 879: 741:27±2°. This is equivalent to 1327:10.1016/j.icarus.2016.07.011 626:Gaspra appears to be fairly 7: 916:. Jet Propulsion Laboratory 614:, or half the land area of 369:Argument of perihelion 10: 1890: 645: 192:Minor planet category 1864:S-type asteroids (Tholen) 1795: 1737: 1674: 1626: 1593: 1584: 1578:Small Solar System bodies 1519: 537: 522: 486: 468: 454: 438: 419: 402: 385: 378: 366: 354: 344: 332: 317: 304:Orbital period (sidereal) 301: 291: 279: 269: 256: 246: 238: 226: 219: 189: 151: 131: 93: 81: 76: 68: 56: 44: 39: 24: 1869:S-type asteroids (SMASS) 1164:Earth, Moon, and Planets 998:Small Bodies Data Ferret 594:Physical characteristics 525:Absolute magnitude  380:Physical characteristics 154:Alternative designations 1513:Minor planets navigator 1422:JPL Small-Body Database 1176:1996EM&P...75...53S 936:"951 Gaspra (1916 S45)" 441:Synodic rotation period 252:103.54 yr (37,819 days) 221:Orbital characteristics 1703:Trans-Neptunian object 1386:Observation prediction 1261:10.1006/icar.1994.1002 1095:10.1006/icar.2002.6837 1052:10.1006/icar.1994.1004 850: 725: 715: 665: 1027:"The Shape of Gaspra" 764: 723: 713: 655: 240:Uncertainty parameter 1676:Distant minor planet 743:ecliptic coordinates 590:on 29 October 1991. 84:MPC designation 1849:Named minor planets 1473:Physical parameters 1318:2016Icar..280..340D 1288:2007LPI....38.2165B 1252:1994Icar..107....2V 1125:1992Sci...257.1647B 1087:2002Icar..158...98K 1043:1994Icar..107...23T 940:Minor Planet Center 69:Discovery date 58:Discovery site 21: 1410:Observational info 1184:10.1007/BF00056288 869:optical navigation 851: 726: 716: 706:Orbit and rotation 666: 230:4 September 2017 ( 46:Discovered by 19: 1821: 1820: 1733: 1732: 1618:Meanings of names 1544: 1543: 1119:(5077): 1647–52. 979:978-3-540-00238-3 679:Baptistina family 541: 540: 1881: 1591: 1590: 1571: 1564: 1557: 1548: 1547: 1506: 1499: 1492: 1483: 1482: 1465:Orbital elements 1429: 1341: 1338: 1332: 1331: 1329: 1297: 1291: 1290: 1272: 1266: 1265: 1263: 1231: 1218: 1217: 1211: 1202: 1196: 1195: 1159: 1153: 1152: 1108: 1099: 1098: 1067:Krasinsky, G. A. 1063: 1057: 1056: 1054: 1022: 1009: 1008: 1006: 1004: 990: 984: 983: 957: 951: 950: 948: 946: 932: 926: 925: 923: 921: 910: 849: 844: 835: 834: 951 Gaspra 833: 824: 819: 810: 805: 796: 791: 782: 777: 771: 642:Surface features 632:S-type asteroids 630:-rich among the 482: 480: 471:Geometric albedo 464: 434: 431: 415: 411: 398: 393: 211: 185: 169: 161: 147: 127: 126: 123: 122: 119: 116: 113: 110: 107: 104: 29: 22: 18: 1889: 1888: 1884: 1883: 1882: 1880: 1879: 1878: 1859:Galileo program 1839:Flora asteroids 1824: 1823: 1822: 1817: 1791: 1729: 1670: 1622: 1580: 1575: 1545: 1540: 1515: 1510: 1402:Proper elements 1349: 1344: 1339: 1335: 1298: 1294: 1273: 1269: 1232: 1221: 1209: 1203: 1199: 1160: 1156: 1109: 1102: 1064: 1060: 1023: 1012: 1002: 1000: 992: 991: 987: 980: 958: 954: 944: 942: 934: 933: 929: 919: 917: 912: 911: 886: 882: 842: 841: 831: 830: 817: 816: 803: 802: 789: 788: 775: 774: 773: 769: 759: 728: 727: 708: 699:escape velocity 650: 644: 624: 596: 530: 514: 509: 501: 491: 478: 476: 473: 462: 459: 443: 432: 429: 425: 413: 409: 397:(mean diameter) 396: 394: 391: 371: 359: 337: 322: 306: 284: 282:Semi-major axis 248:Observation arc 212: 205: 194: 184: 180: 179: 170: 167: 159: 156: 141: 140: 134: 101: 97: 86: 35: 17: 12: 11: 5: 1887: 1877: 1876: 1871: 1866: 1861: 1856: 1851: 1846: 1841: 1836: 1819: 1818: 1816: 1815: 1810: 1805: 1799: 1797: 1793: 1792: 1790: 1789: 1784: 1779: 1777:Near-parabolic 1774: 1769: 1764: 1759: 1754: 1749: 1743: 1741: 1735: 1734: 1731: 1730: 1728: 1727: 1726: 1725: 1723:Scattered disc 1720: 1715: 1710: 1700: 1695: 1694: 1693: 1691:Neptune trojan 1688: 1680: 1678: 1672: 1671: 1669: 1668: 1666:Spectral types 1663: 1658: 1656:Jupiter trojan 1653: 1648: 1643: 1638: 1632: 1630: 1624: 1623: 1621: 1620: 1615: 1610: 1605: 1600: 1594: 1588: 1582: 1581: 1574: 1573: 1566: 1559: 1551: 1542: 1541: 1539: 1538: 1533: 1526: 1520: 1517: 1516: 1509: 1508: 1501: 1494: 1486: 1478: 1477: 1476: 1475: 1433:Close approach 1414: 1413: 1412: 1366: 1361: 1356: 1348: 1347:External links 1345: 1343: 1342: 1333: 1292: 1267: 1219: 1197: 1154: 1100: 1071:Pitjeva, E. V. 1058: 1010: 985: 978: 952: 927: 883: 881: 878: 758: 755: 718: 717: 707: 704: 643: 640: 623: 620: 605:impact craters 595: 592: 539: 538: 535: 534: 531: 523: 520: 519: 492: 487: 484: 483: 474: 469: 466: 465: 460: 455: 452: 451: 444: 439: 436: 435: 426: 420: 417: 416: 406: 400: 399: 389: 383: 382: 376: 375: 372: 367: 364: 363: 360: 355: 352: 351: 348: 342: 341: 338: 333: 330: 329: 323: 318: 315: 314: 307: 302: 299: 298: 295: 289: 288: 285: 280: 277: 276: 273: 267: 266: 260: 254: 253: 250: 244: 243: 236: 235: 224: 223: 217: 216: 195: 190: 187: 186: 182: 157: 152: 149: 148: 135: 132: 129: 128: 95: 91: 90: 87: 82: 79: 78: 74: 73: 70: 66: 65: 60: 54: 53: 48: 42: 41: 37: 36: 30: 15: 9: 6: 4: 3: 2: 1886: 1875: 1872: 1870: 1867: 1865: 1862: 1860: 1857: 1855: 1852: 1850: 1847: 1845: 1842: 1840: 1837: 1835: 1832: 1831: 1829: 1814: 1811: 1809: 1806: 1804: 1801: 1800: 1798: 1794: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1765: 1763: 1760: 1758: 1755: 1753: 1750: 1748: 1745: 1744: 1742: 1740: 1736: 1724: 1721: 1719: 1716: 1714: 1711: 1709: 1706: 1705: 1704: 1701: 1699: 1696: 1692: 1689: 1687: 1684: 1683: 1682: 1681: 1679: 1677: 1673: 1667: 1664: 1662: 1659: 1657: 1654: 1652: 1649: 1647: 1646:Asteroid belt 1644: 1642: 1641:Aten asteroid 1639: 1637: 1634: 1633: 1631: 1629: 1625: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1595: 1592: 1589: 1587: 1586:Minor planets 1583: 1579: 1572: 1567: 1565: 1560: 1558: 1553: 1552: 1549: 1537: 1534: 1532: 1531: 1527: 1525: 1522: 1521: 1518: 1514: 1507: 1502: 1500: 1495: 1493: 1488: 1487: 1484: 1480: 1474: 1470: 1466: 1462: 1458: 1457:Orbit diagram 1454: 1450: 1446: 1442: 1438: 1434: 1431: 1430: 1428: 1424: 1423: 1418: 1415: 1411: 1407: 1403: 1399: 1395: 1391: 1387: 1383: 1379: 1376: 1375: 1374: 1370: 1367: 1365: 1362: 1360: 1357: 1354: 1351: 1350: 1337: 1328: 1323: 1319: 1315: 1311: 1307: 1303: 1296: 1289: 1285: 1281: 1280: 1271: 1262: 1257: 1253: 1249: 1245: 1241: 1237: 1230: 1228: 1226: 1224: 1215: 1208: 1201: 1193: 1189: 1185: 1181: 1177: 1173: 1169: 1165: 1158: 1150: 1146: 1142: 1138: 1134: 1130: 1126: 1122: 1118: 1114: 1107: 1105: 1096: 1092: 1088: 1084: 1081:(1): 98–105. 1080: 1076: 1072: 1068: 1062: 1053: 1048: 1044: 1040: 1036: 1032: 1028: 1021: 1019: 1017: 1015: 999: 995: 989: 981: 975: 971: 967: 963: 956: 941: 937: 931: 915: 909: 907: 905: 903: 901: 899: 897: 895: 893: 891: 889: 884: 877: 874: 870: 865: 860: 857: 856: 848: 839: 828: 823: 814: 809: 800: 795: 786: 781: 768: 765:Animation of 763: 754: 752: 748: 744: 740: 736: 731: 722: 712: 703: 700: 694: 692: 688: 682: 680: 675: 671: 663: 659: 654: 649: 639: 637: 633: 629: 619: 617: 613: 608: 606: 602: 591: 589: 585: 584: 578: 576: 572: 568: 564: 560: 559:G. N. Neujmin 556: 555:asteroid belt 552: 549: 545: 536: 532: 529: 528: 521: 517: 512: 508: 504: 500: 496: 493: 490: 489:Spectral type 485: 475: 472: 467: 461: 458: 453: 449: 445: 442: 437: 430:2.7 g/cm 427: 424: 418: 407: 405: 401: 395:12.2 km 390: 388: 384: 381: 377: 373: 370: 365: 361: 358: 353: 349: 347: 343: 340:0° 18 0 / day 339: 336: 331: 328: 324: 321: 316: 312: 308: 305: 300: 296: 294: 290: 286: 283: 278: 274: 272: 268: 265: 261: 259: 255: 251: 249: 245: 241: 237: 233: 229: 225: 222: 218: 215: 209: 203: 199: 196: 193: 188: 177: 173: 165: 158: 155: 150: 145: 139: 136: 130: 125: 96: 94:Pronunciation 92: 88: 85: 80: 75: 71: 67: 64: 61: 59: 55: 52: 49: 47: 43: 38: 33: 28: 23: 1813:Space debris 1528: 1524:950 Ahrensa 1479: 1468: 1460: 1452: 1444: 1436: 1420: 1405: 1397: 1394:Orbital info 1389: 1381: 1372: 1336: 1309: 1305: 1295: 1276: 1270: 1243: 1239: 1213: 1200: 1170:(1): 53–75. 1167: 1163: 1157: 1116: 1112: 1078: 1074: 1061: 1037:(1): 23–36. 1034: 1030: 1001:. Retrieved 997: 988: 961: 955: 943:. Retrieved 939: 930: 918:. Retrieved 872: 863: 861: 853: 852: 837: 826: 812: 798: 784: 779: 766: 732: 729: 695: 683: 674:Flora family 670:253 Mathilde 667: 625: 609: 597: 581: 579: 543: 542: 526: 320:Mean anomaly 313:(1,200 days) 293:Eccentricity 201: 178: A913 YA 175: 163: 89:(951) Gaspra 77:Designations 72:30 July 1916 31: 1803:Cosmic dust 1767:Long-period 1757:Halley-type 1713:Kuiper belt 1598:Designation 1353:short intro 1312:: 340–358. 1246:(1): 2–17. 757:Exploration 739:declination 622:Composition 603:of Gaspra, 346:Inclination 335:Mean motion 133:Named after 63:Simeiz Obs. 1828:Categories 1808:Meteoroids 1787:Sungrazing 1762:Hyperbolic 1718:Oort cloud 1661:Near-Earth 1530:951 Gaspra 1417:951 Gaspra 1369:951 Gaspra 1359:JPL images 1355:: 2 photos 1003:24 October 945:19 October 920:19 October 880:References 747:axial tilt 664:, to scale 646:See also: 544:951 Gaspra 457:Axial tilt 433:(estimate) 414:(estimate) 387:Dimensions 271:Perihelion 234:2458000.5) 51:G. Neujmin 20:951 Gaspra 1698:Damocloid 1449:Ephemeris 1441:Discovery 1378:Ephemeris 1192:122026431 616:Hong Kong 567:Black Sea 450:(0.293 d) 287:2.2099 AU 275:1.8267 AU 198:main-belt 142:(Crimean 40:Discovery 1782:Periodic 1708:Detached 1628:Asteroid 1536:952 Caia 1149:23801250 1141:17841160 691:regolith 636:pyroxene 551:asteroid 258:Aphelion 172:SIGMA 45 168:1916 Σ45 160:1916 S45 144:spa town 1747:Extinct 1686:Centaur 1419:at the 1314:Bibcode 1284:Bibcode 1248:Bibcode 1172:Bibcode 1121:Bibcode 1113:Science 1083:Bibcode 1039:Bibcode 873:Galileo 864:Galileo 855:Galileo 847:243 Ida 820:  794:Jupiter 780:Galileo 767:Galileo 751:243 Ida 737:0h40m, 628:olivine 601:gravity 588:Jupiter 583:Galileo 575:Tolstoy 518:= 0.554 513:= 0.870 423:density 374:129.94° 362:253.06° 350:4.1063° 262:2.5931 181:1955 MG 32:Galileo 1739:Comets 1651:Family 1636:Active 1603:Groups 1469:· 1467:  1461:· 1459:  1453:· 1451:  1445:· 1443:  1437:· 1435:  1406:· 1404:  1398:· 1396:  1390:· 1388:  1382:· 1380:  1306:Icarus 1240:Icarus 1216:: 453. 1190:  1147:  1139:  1075:Icarus 1031:Icarus 976:  845:  843:  838:· 836:  832:  827:· 825:  818:  813:· 811:  806:  804:  799:· 797:  792:  790:  785:· 783:  778:  776:  770:'s 687:Phobos 662:Deimos 658:Phobos 563:Gaspra 548:S-type 546:is an 495:Tholen 446:7.042 410:3 × 10 325:232.83 297:0.1734 202:· 200:  176:· 174:  164:· 162:  138:Gaspra 1796:Other 1752:Great 1471: 1463: 1455: 1447: 1439: 1408: 1400: 1392: 1384: 1277:38th 1210:(PDF) 1188:S2CID 1145:S2CID 840: 829: 822:Venus 815: 808:Earth 801: 787: 571:Gorky 533:11.46 503:SMASS 481:0.032 477:0.246 421:Mean 309:3.29 228:Epoch 214:Flora 208:inner 204: 166: 1772:Lost 1613:Moon 1608:List 1137:PMID 1005:2019 974:ISBN 947:2017 922:2017 660:and 612:Guam 573:and 565:, a 404:Mass 1371:at 1322:doi 1310:280 1256:doi 1244:107 1180:doi 1129:doi 1117:257 1091:doi 1079:158 1047:doi 1035:107 966:doi 527:(H) 516:U–B 511:B–V 463:72° 412:kg 1830:: 1320:. 1308:. 1304:. 1254:. 1242:. 1238:. 1222:^ 1212:. 1186:. 1178:. 1168:75 1166:. 1143:. 1135:. 1127:. 1115:. 1103:^ 1089:. 1077:. 1069:; 1045:. 1033:. 1029:. 1013:^ 996:. 972:. 938:. 887:^ 735:RA 693:. 618:. 577:. 505:= 497:= 408:2– 311:yr 264:AU 232:JD 1570:e 1563:t 1556:v 1505:e 1498:t 1491:v 1330:. 1324:: 1316:: 1286:: 1264:. 1258:: 1250:: 1194:. 1182:: 1174:: 1151:. 1131:: 1123:: 1097:. 1093:: 1085:: 1055:. 1049:: 1041:: 1007:. 982:. 968:: 949:. 924:. 507:S 499:S 479:± 448:h 428:~ 327:° 242:0 210:) 206:( 183:1 146:) 124:/ 121:ə 118:r 115:p 112:s 109:æ 106:ɡ 103:ˈ 100:/

Index


Discovered by
G. Neujmin
Discovery site
Simeiz Obs.
MPC designation
/ˈɡæsprə/
Gaspra
spa town
Alternative designations
SIGMA 45
Minor planet category
main-belt
inner
Flora
Orbital characteristics
Epoch
JD
Uncertainty parameter
Observation arc
Aphelion
AU
Perihelion
Semi-major axis
Eccentricity
Orbital period (sidereal)
yr
Mean anomaly
°
Mean motion

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