Moon
Phobos
- Type
- Moon
- Diameter
- 22 km
NASA/JPL/Malin Space Science Systems · NASA media (public domain)
Overview
Scientific overview
Phobos is a moon orbiting Mars.
Physical characteristics
- Diameter
- 22 km
- Radius
- 11.1 km
- Density
- 1.872 g/cm³
- Albedo
- 0.071
- Magnitude
- 11.4
Scale
Compared to Earth
Phobos is 579× smaller than Earth
22 km across · Earth is 12,742 km
Gallery
Temperature Gradient on Martian Moon Phobos
This image combines two products from the first pointing at the Martian moon Phobos by the Thermal Emission Imaging System (THEMIS) camera on NASA's Mars Odyssey orbiter, on Sept.
2017
NASA/JPL-Caltech/ASU · NASA media (public domain)
Observation
How this was captured
- Source
- NASA
- Observation date
- 2003-05-16
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.