Map of the Universe
Phobos
Moon · Larger of the two moons of Mars
About Phobos
On 2026-01-01, the date the map shows, Phobos was 1.43 AU from the Sun; sunlight takes 11.9 minutes to reach it.
It goes round its planet once every 0.32 days, 9,378 km away on average.
It is about 22.6 km across.
The map lists it as a moon and shows it in the Solar System part of the map, drawn on the plane of Earth’s orbit (the ecliptic).
Key numbers
| Orbit radius (semi-major axis) | 9,378 km |
|---|---|
| Orbital period | 0.32 days |
| Eccentricity | 0.0155 |
| Inclination | 27.42° |
| Radius | 11.3 km |
| Distance from the Sun | 1.43 AU |
Where it is
Its place in the universe, from the inside out: Mars › Solar System › Orion–Cygnus Arm (Local Arm) › Milky Way › Local Group › Virgo Supercluster › Laniakea Supercluster › Observable universe.
Zoom out to see it in context: Inner planets, a view about 4 AU across.
From Wikipedia
Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after the Greek god of fear and panic, who is the twin brother of Deimos and son of Ares (Mars).
Excerpt from the Wikipedia article Phobos (moon), licensed CC BY-SA 4.0.