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  2. Phobos (moon) - Wikipedia

    en.wikipedia.org/wiki/Phobos_(moon)

    By comparison, the Sun has an apparent size of about 0.35° in the Martian sky. Phobos' phases, inasmuch as they can be observed from Mars, take 0.3191 days (Phobos' synodic period) to run their course, a mere 13 seconds longer than Phobos' sidereal period.

  3. Moons of Mars - Wikipedia

    en.wikipedia.org/wiki/Moons_of_Mars

    Compared to the Earth's Moon, the moons Phobos and Deimos are small. Phobos has a diameter of 22.2 km (13.8 mi) and a mass of 1.08 × 10 16 kg, while Deimos measures 12.6 km (7.8 mi) across, with a mass of 1.5 × 10 15 kg.

  4. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets , the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.

  5. Deimos (moon) - Wikipedia

    en.wikipedia.org/wiki/Deimos_(moon)

    Size comparison between Phobos, Deimos and the Moon (right) Deimos is a gray-colored body. Like most bodies of its size, Deimos is highly non-spherical with triaxial dimensions of 16.1 km × 11.8 km × 10.2 km (10.0 mi × 7.3 mi × 6.3 mi), corresponding to a mean diameter of 12.5 km (7.8 mi) which makes it about 57% the size of Phobos. [7]

  6. Natural satellite - Wikipedia

    en.wikipedia.org/wiki/Natural_satellite

    Size comparison of Earth and the Moon There is no established lower limit on what is considered a "moon". Every natural celestial body with an identified orbit around a planet of the Solar System , some as small as a kilometer across, has been considered a moon, though objects a tenth that size within Saturn's rings, which have not been ...

  7. Tidal locking - Wikipedia

    en.wikipedia.org/wiki/Tidal_locking

    Charon is a relatively large moon in comparison to its primary and also ... Even knowing the size and density of the satellite leaves ... Moon [37] Mars: Phobos [38 ...

  8. Astronomy on Mars - Wikipedia

    en.wikipedia.org/wiki/Astronomy_on_Mars

    The maximum brightness of Phobos at "full moon" is about magnitude −9 or −10, while for Deimos it is about −5. [9] By comparison, the full Moon as seen from Earth is considerably brighter at magnitude −12.7. Phobos is still bright enough to cast shadows; Deimos is only slightly brighter than Venus is from Earth. Just like Earth's Moon ...

  9. List of natural satellites - Wikipedia

    en.wikipedia.org/wiki/List_of_natural_satellites

    Mars has two known moons, Phobos and Deimos ("fear" and "dread", after attendants of Ares, the Greek god of war, equivalent to the Roman Mars). Searches for more satellites have been unsuccessful, putting the maximum radius of any other satellites at 90 m (100 yd).