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Astronomy Picture of the Day
2009 March 16
Martian Moon Deimos from MRO
Credit: HiRISE, MRO, LPL (U. Arizona), NASA

Explanation: Mars has two tiny moons, Phobos and Deimos. Pictured above, in a recently release image by HiRISE camera onboard the Mars-orbiting Mars Reconnaissance Orbiter (MRO), is Deimos, the smaller moon of Mars. Deimos is one of the smallest known moons in the Solar System measuring only about 15 kilometers across. The diminutive Martian moon was discovered in 1877 by Asaph Hall, an American astronomer working at the US Naval Observatory in Washington D.C. The existence of two Martian moons was predicted around 1610 by Johannes Kepler, the astronomer who derived the laws of planetary motion. In this case, Kepler's prediction was not based on scientific principles, but his writings and ideas were so influential that the two Martian moons are discussed in works of fiction such as Jonathan Swift's Gulliver's Travels, written in 1726, over 150 years before their actual discovery.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC
& Michigan Tech. U.

Appears on these pages
of

  • Deimos

    Deimos is the second moon of Mars. Discovered in August 12, 1877 by Asaph Hall.

  • List of natural satellites

    Try a numeral version.

  • Main Page

    Welcome to Planetary Database, Data for the Celestial Bodies! Planetary Database is a database...

See full list >

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current04:59, June 30, 2014Thumbnail for version as of 04:59, June 30, 2014592 × 592 (49 KB)Jcpag2010 (wall | contribs)
08:40, October 16, 2013Thumbnail for version as of 08:40, October 16, 2013413 × 417 (12 KB)Jcpag2010 (wall | contribs)
06:57, August 5, 2013Thumbnail for version as of 06:57, August 5, 2013400 × 400 (5 KB)Jcpag2010 (wall | contribs)

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