Terby is a
crater
Crater may refer to:
Landforms
*Impact crater, a depression caused by two celestial bodies impacting each other, such as a meteorite hitting a planet
*Explosion crater, a hole formed in the ground produced by an explosion near or below the surfac ...
on the northern edge of
Hellas Planitia,
Mars. It is in the
Iapygia quadrangle. The crater is centered at 28°S, 73°E with an elevation of . It is named after
François J. Terby. It is the site of an ancient lakebed and has
clay deposits. Using data from Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter missions researchers believe Terby's layers were formed from sediments settling under water. Crater counts show this happened during the
Noachian period
The Noachian is a geologic system and early time period on the planet Mars characterized by high rates of meteorite and asteroid impacts and the possible presence of abundant surface water. The absolute age of the Noachian period is uncertain b ...
. It used to be thought that Terby Crater contained a large delta. However, newer observations have led researchers to think of the layered sequence as part of a group of layers that may have extended all the across Hellas. There is no valley large enough at the northern rim of Terby to have carried the large amount of sediments necessary to produce the layers. Other details in the layers argue against Terby's containing a delta. Fan deposits are some of the thickest on Mars. Hydrated minerals, including iron/magnesium phyllosilicates, have been detected in several layers.
[Ansan, V., D. Loizeau, M. Mangold, S., Le Mouélic, J. Carter, F. Poulet, G. Dromart, A. Lucas, J.-P. Bibring, A. Gendrin, B. Gondet, Y. Langevin, Ph. Massond, S. Murchie, J. Mustard, G. Neukum. 2011. "Stratigraphy, mineralogy, and origin of layered deposits inside Terby crater, Mars". ''Icarus'': 211, 273–304.]
Images
Wikisuzhimola.jpg, MOLA map showing Terby Crater and nearby craters. Colors indicate elevations.
Image:Iapygia map.JPG, Map of Iapygia quadrangle with major craters.
Image:Terby crater dn12873-3 600.jpg, Terby crater - contains many rock layers.
Image:Terby crater .jpg, Layers in Terby crater may have formed when the Hellas basin was filled with water.
Image:Terby Crater.JPG, Terby Crater layers as seen by HiRISE.
Wikiterby.jpg, Northern part of Terby Crater showing many layers, as seen by CTX camera (on Mars Reconnaissance Orbiter). Parts of this image are enlarged in next two images.
Wikiterbyclose.jpg, Northern part of Terby Crater showing many layers, as seen by CTX camera (on Mars Reconnaissance Orbiter).
Wikiterbyclose2.jpg, Northern part of Terby Crater showing many layers, as seen by CTX camera (on Mars Reconnaissance Orbiter).
See also
*
Climate of Mars
*
HiRISE
*
HiWish program
*
Hydrothermal circulation
*
Impact event
An impact event is a collision between astronomical objects causing measurable effects. Impact events have physical consequences and have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or me ...
*
Lakes on Mars
In summer 1965, the first close-up images from Mars showed a cratered desert with no signs of water. However, over the decades, as more parts of the planet were imaged with better cameras on more sophisticated satellites, Mars showed evidence o ...
*
List of craters on Mars
__NOTOC__
This is a list of craters on Mars. Impact craters on Mars larger than exist by the hundreds of thousands, but only about one thousand of them have names. Names are assigned by the International Astronomical Union after petitioning by ...
*
Ore genesis
*
Ore resources on Mars
*
Water on Mars
References
External links
Evidence for Lacustrine Deposition at the crater TerbyHiRISE observation of the crater Terby
{{Portal bar, Solar System
Iapygia quadrangle
Impact craters on Mars