Asteroid
The largest asteroid of the stony S-type, and the most massive asteroid without a spacecraft visit as of its discovery era.
| Type | Asteroid |
|---|---|
| Distance from the Sun | 2.64 AU |
| Diameter | 268 km |
| Mass | 3.12 × 10¹⁹ kg |
| Temperature | -103°C |
| Orbital period | 1,569 days |
| Rotation period | 6.083 hours |
| Apparent magnitude | 7.9 |
| Redshift | 0 |
| Discovered | 1851 |
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 268 km across, 15 Eunomia is 2.1 percent of the diameter of Earth.
Its mass is less than a thousandth of the mass of Earth.
It keeps an average distance of 2.64 AU from the Sun, so sunlight takes 22 minutes to reach it.
A single orbit takes 4.3 years.
An average temperature of 170 K works out at -103 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1851.
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