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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.
29 lis 2021 · Imaging data reveals a low albedo of both moons – Phobos: ∼0.07; Deimos: ∼0.08. Also, Phobos manifests distinct redder and bluer units, whereas the surface of Deimos is globally comparable to the Phobos redder units with localized streaks of brighter material.
18 kwi 2018 · We find that forming Phobos-Deimos requires an oblique impact by a Vesta-to-Ceres sized object with ~10 −3 times Mars’ mass, a much less massive impactor than previously considered. INTRODUCTION Unlike the Moon, whose mass is about 1% of the mass of the Earth, the combined mass of Phobos and Deimos is only M PD = 2 × 10 −8 M M , where M ...
8 gru 2017 · Phobos and Deimos bear more resemblance to asteroids than to Earth's moon. Both are tiny — the larger, Phobos, is only 14 miles across (22 kilometers), while the smaller, Deimos, is only...
1 gru 2021 · Imaging data reveals a low albedo of both moons – Phobos: ∼0.07; Deimos: ∼0.08. Also, Phobos manifests distinct redder and bluer units, whereas the surface of Deimos is globally comparable ...
Phobos is a bit larger than Deimos, and orbits only 3,700 miles (6,000 kilometers) above the Martian surface. No known moon orbits closer to its planet. It whips around Mars three times a day, while the more distant Deimos takes 30 hours for each orbit.
Deimos’ density (1.471±0.166 g/cm3) is lower than Phobos’s (1.876 g/cm3). Also, while Deimos is uni-formly dark red, Phobos presents two spectral units: a “Redder Unit” (similar to Deimos) dominating most of Phobos (> 65%), and a “Bluer Unit” (red also, but significantly less so than Deimos) of more limited
