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or is used within the spacecraft's on-board software to signal conditions that must be tracked or acted upon, especially when the status changes. A tell-tale may continually change as the status it is tracking changes, or, it may change once upon change of status and then remain at that value until
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deliberately cleared. The latter type of tell-tale is known as a "sticky-bit" because its value "sticks", that is, remains constant, once it has been set.
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recorded images of its motion to be used to determine wind direction and speed.
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spacecraft contains another type of tell-tale, developed by the
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is a single-bit status indicator that is included in
129:Phoenix Landing Mission to the Martian Polar North
110:"Mars Probe Brings the "Weather Rock" New Respect"
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40:. It is a small tube that is deflected by the
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73:. Oxford University Press. p. 629.
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69:Pisacane, Vincent L., ed. (2005).
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71:Fundamentals of Space Systems
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84:Mars Simulation Laboratory,
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36:in Denmark, as part of its
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157:Spacecraft communication
48:. The science payload's
38:Meteorological Station
92:University of Aarhus
87:The Telltale project
34:University of Aarhus
44:wind, similar to a
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96:the original
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56:References
22:telemetry
18:tell-tale
151:Category
114:Slashdot
42:martian
30:Phoenix
133:(PDF)
137:NASA
28:The
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