Phobos Gets a Close-up

Today scientists working with NASA's Mars Reconnaissance Orbiter released an awesome color view of Phobos, which at just over 16 miles long is only a little bigger than Manhattan Island.

Martian moon Phobos
NASA's Mars Reconnaissance Orbiter captured this view of the Martian moon Phobos on March 23, 2008, from a distance of about 4,200 miles. It's actually a false-color view, combining data from the camera's blue-green, red, and near-infrared channels.The smallest resolved features are about 65 feet across.
NASA / JPL / Univ. of Arizona
Still, it's a fascinating place. At the right end of the image here you can see the large crater Stickney and, radiating away from it, a series of surface fractures created during its formation.

Mars-orbiting spacecraft have been photographing Phobos since the early 1970s, and you can find plenty of other snapshots — for example, ones taken by NASA's Mars Global Surveyor, by the European Space Agency's Mars Express, and even by the Soviet Union's ill-fated Phobos spacecraft.

Ah, yes — the Phobos mission. It's been nearly 20 years since the Soviet Union launched a nearly identical pair of spacecraft toward Mars. Phobos 1 was lost a couple of months after launch due to a programming error. Phobos 2 made into Martian orbit, had rendezvoused with the moon, and was days away from dropping two little landers when it fell silent due to computer failure. Boy, that sure brings back (painful) memories!

Remarkably, the Russians are about to try again. Phobos-Grunt, to be launched next year, will attempt to land on the moonlet and return a sample of its surface to Earth. ("Grunt" is Russian for soil or ground.) There's not a lot of information available on the mission yet, but try this summary from the European Space Agency and this one written by the mission's chief scientist.

Back to the picture seen here, it was taken with MRO's main camera, called Hi-RISE, but to call it a "camera" doesn't do it justice. It's really a beefy telescope with a 0.5-meter (20-inch) aperture and f/24 optics. It was designed to resolve details on the Martian surface only 1 foot across, and it's been doing just that since MRO slipped into orbit around Mars two years ago.

You can check out NASA's press release if you want, but instead I'd suggest that you head over to the HiRISE website and get to know Phobos up close and personal.

3 thoughts on “Phobos Gets a Close-up

  1. Al Wilson

    Wow! Oh man, I just broke my swear jar and ate both the contents and the glass fragments alike with a garnish of happy obscenities in as many languages as I could babel fish for!

  2. Tomasz Kokowski

    For a little bit more than name of Russian Phobos-Grunt mission scheduled to launch in 2009, find this page
    http://www.russianspaceweb.com/spacecraft_planetary_mars.html.
    Interesting that this spacecraft will carry on board Chinese sub-probe Yinghuo-1.

    And besides, IMHO this site is a kind of “golden mine” of history and latest news on space exploration by formerly Soviet Union and Russia. For example, Soviet Moon Exploation plans.

  3. Myron Miller

    An amazing photo; it looks like whatever hit the moon on the right of the picture forced an elongated extrusion on the opposite side. It’s curious that it hung together with such an impact.

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