archiv~1.txt: SETI [ASTRO] More Mars Global Surveyor Images

SETI [ASTRO] More Mars Global Surveyor Images

Larry Klaes ( )
Fri, 12 Mar 1999 16:58:35 -0500

>X-Authentication-Warning: majordom set sender
to owner-astro using -f
>Date: Thu, 11 Mar 1999 22:48:07 GMT
>From: Ron Baalke <>
>Subject: [ASTRO] More Mars Global Surveyor Images
>Reply-To: Ron Baalke <>
>March 11, 1999
>Three more new images taken by the Mars Global Surveyor spacecraft
>are now available:
> o Boulders In Ganges Chasma (1.5 meter resolution!)
> o Sand Dunes of Nili Patera, Syrtis Major (Wow!)
> o "Happy Face" Crater (Smile!)
>The images reside on the MGS website:
>This is one of the MGS mirror sites which we currently recommend, as
>the main MGS website is getting hit hard with millions of hits today.
>The image captions are appended below.
>Ron Baalke
>1.5 Meter Per Pixel View of Boulders in Ganges Chasma
>MGS MOC Release No. MOC2-87, 11 March 1999
>The Mars Orbiter Camera (MOC) on board the Mars Global Surveyor (MGS)
>spacecraft was designed to be able to take pictures that "bridge the gap"
>between what could be seen by the Mariner 9 and Viking Orbiters from space
>and what could be seen by landers from the ground. In other words, MOC was
>designed to be able to see boulders of sizes similar to and larger than
>those named "Yogi" at the Mars Pathfinder site and "Big Joe" at the Viking 1
>landing site. To see such boulders, a resolution of at least 1.5 meters (5
>feet) per pixel was required.
>With the start of the MGS Mapping Phase of the mission during the second
>week of March 1999, the MOC team is pleased to report that "the gap is
>bridged". This image shows a field of boulders on the surface of a landslide
>deposit in Ganges Chasma. Ganges Chasma is one of the valleys in the Valles
>Marineris canyon system. The image resolution is 1.5 meters per pixel. The
>boulders shown here range in size from about 2 meters (7 feet) to about 20
>meters (66 feet) in size. The image covers an area 1 kilometer (0.62 miles)
>across, and illumination is from the upper left.
>Sand Dunes of Nili Patera, Syrtis Major
>MGS MOC Release No. MOC2-88, 11 March 1999
>This dramatic image shows a field of dark sand dunes in the Nili Patera
>region of Syrtis Major. The shapes of these dunes indicate that wind has
>been steadily transporting the dark sand from the right/upper right toward
>the lower left. This picture was taken on the first day of the MGS Mapping
>Phase during the second week of March 1999. It shows an area 2.1 kilometers
>(1.3 miles) wide at the full commanded resolution of 3 meters per pixel.
>Illumination is from the upper left.
>"Happy Face" Crater Greets MGS at the Start of the Mapping Mission
>MGS MOC Release No. MOC2-89, 11 March 1999
>The story of the Mars Orbiter Camera (MOC) onboard the Mars Global Surveyor
>(MGS) spacecraft began with a proposal to NASA in 1985. The first MOC flew
>on Mars Observer, a spacecraft that was lost before it reached the red
>planet in 1993. Now, after 14 years of effort, a MOC has finally been placed
>in the desired mapping orbit. The MOC team's happiness is perhaps best
>expressed by the planet Mars itself. On the first day of the Mapping Phase
>of the MGS mission--during the second week of March 1999--MOC was greeted
>with this view of "Happy Face Crater" (center right) smiling back at the
>camera from its location on the east side of Argyre Planitia. This crater is
>officially known as Galle Crater, and it is about 215 kilometers (134 miles)
>across. The picture was taken by the MOC's red and blue wide angle cameras.
>The bluish-white tone is caused by wintertime frost. Illumination is from
>the upper left. For more information and Viking Orbiter views of "Happy Face
>Crater," see