Asteroid
An asteroid in the main belt that was found to have its own tiny moon, Dactyl.
| Type | Asteroid |
|---|---|
| Distance from the Sun | 2.86 AU |
| Diameter | 31 km |
| Mass | 4.20 × 10¹⁶ kg |
| Temperature | -73°C |
| Moons | 1 |
| Orbital period | 1,767 days |
| Rotation period | 4.634 hours |
| Apparent magnitude | 12.9 |
| Redshift | 0 |
| Discovered | 1884 |
Asteroids are rocky leftovers from the solar system's formation, most of them confined to the belt between Mars and Jupiter where Jupiter's gravity kept them from ever assembling into a planet.
At 31 km across, Ida is 0.2 percent of the diameter of Earth.
Its mass is less than a thousandth of the mass of Earth.
It keeps an average distance of 2.86 AU from the Sun, so sunlight takes 24 minutes to reach it.
A single orbit takes 4.8 years.
An average temperature of 200 K works out at -73 degrees Celsius, colder than the 15 degrees Earth averages.
One moon is known to orbit it.
It has been on record since 1884.
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