Asteroid
One of the first asteroids discovered, bright enough to occasionally be visible with the naked eye.
| Type | Asteroid |
|---|---|
| Distance from the Sun | 2.67 AU |
| Diameter | 247 km |
| Mass | 2.67 × 10¹⁹ kg |
| Temperature | -110°C |
| Orbital period | 1,594 days |
| Rotation period | 7.21 hours |
| Apparent magnitude | 7.5 |
| Redshift | 0 |
| Discovered | 1804 |
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 247 km across, 3 Juno is 1.9 percent of the diameter of Earth.
Its mass is less than a thousandth of the mass of Earth.
It keeps an average distance of 2.67 AU from the Sun, so sunlight takes 22 minutes to reach it.
A single orbit takes 4.4 years.
An average temperature of 163 K works out at -110 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1804.
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