Deimos (/ ˈ d aɪ m ə s /; systematic designation: Mars II) [11] is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars. [5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. [12]

Nov 3, 2024 · Deimos orbits Mars every 30 hours. Although both moons are heavily cratered, Deimos has a smoother appearance caused by the partial filling of some of its craters. Deimos is the smaller of the two Martian moons and is less irregular in shape.

2 days ago · Discovered in 1877 by astronomer Asaph Hall, Deimos is the smaller of Mars’s two moons. Measuring 7.7 miles (12.4 kilometers) across, dust-covered Deimos is thought to be a leftover of a giant ...

Jan 15, 2025 · Deimos is Mars' outer moon. It's a tiny, irregularly shaped moon and smaller than Mars' other moon, Phobos. Despite being unspectacular, Deimos remains a fascinating mystery.

3 days ago · Europe's Hera mission, on its way to the Didymos–Dimorphos double asteroid system, has performed a close flyby of Mars, receiving a crucial gravitational slingshot, testing some of its...

1 day ago · Deimos is tidally locked, meaning one hemisphere permanently faces Mars. This near side is the one most commonly seen by spacecraft orbiting the planet, or by rovers driving across its surface.

Mar 5, 2025 · Deimos, the outer and smaller of Mars’s two moons. It was discovered telescopically with its companion moon, Phobos, by the American astronomer Asaph Hall in 1877 and named for one of the sons of Ares, the Greek counterpart of the Roman god Mars.

2 days ago · While it was so close to Mars, it was also able to turn on a trio of sensors and take several detailed photographs of the planet and Deimos in the same frame. A black and white camera with a ...

2 days ago · Deimos appears to cross Mars. Moving at 9 km/s relative to Mars, Hera was able to image Deimos from as close as 1000 km away, surveying the less-seen opposite side of the tidally locked moon from the red planet. Measuring 12.4 km across, dust-covered Deimos might actually be a leftover of a giant impact on Mars or else a captured asteroid.

2 days ago · During a flyby of Mars on Wednesday (March 12), ESA's Hera spacecraft inaugurated use of its science instruments to image the smaller of the planet's two moons, Deimos. What is it?