Asteroid
The first asteroid discovered to have two moons of its own, which were named Romulus and Remus.
| Type | Asteroid |
|---|---|
| Distance from the Sun | 3.48 AU |
| Diameter | 253 km |
| Mass | 1.48 × 10^19 kg |
| Temperature | -124°C |
| Orbital period | 2,375 days |
| Apparent magnitude | 10.9 |
| Redshift | 0 |
| Discovered | 1866 |
At 253 km across, 87 Sylvia is 2.0 percent of the diameter of Earth.
Its mass is less than a thousandth of the mass of Earth.
It keeps an average distance of 3.485 AU from the Sun, so sunlight takes 29 minutes to reach it.
A single orbit takes 6.5 years.
An average temperature of 149 K works out at -124 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1866.
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