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Bonneville (crater)

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Title: Bonneville (crater)  
Author: World Heritage Encyclopedia
Language: English
Subject: List of craters on Mars: A-G, Moons of Mars, Transit of Venus from Mars, List of surface features of Mars seen by Spirit, Infobox crater data/testcases
Collection: Impact Craters on Mars
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Bonneville (crater)

Bonneville
Overhead view from Mars Global Surveyor on 20 December 2004 with the Spirit rover, its lander, parachute, heatshield impact, backshell and the rover tracks
Planet Mars
Region Gusev crater
Coordinates
Diameter 210 m
Depth 14 m
Discoverer Spirit rover
Eponym Lake Bonneville

Bonneville is an impact crater on Mars. It is located within the much larger crater Gusev. Bonneville was visited by the Mars Exploration Rover Spirit in 2004, during its exploration of the floor of Gusev. Bonneville is also the final resting place of Spirit's heat shield, jettisoned during the landing procedure; the heat-shield could be seen glinting on the opposite wall when Spirit photographed the crater. The crater is 210 metres in diameter, 14 meters deep and its rim rises 6.4 metres above the surrounding terrain.[1]

Bonneville is named after Benjamin Bonneville and Lake Bonneville, an ancient lake in Utah.

Formation and geology

The strata into which Bonneville formed is thought to be loose debris, although some of the ejecta may have originated from more competent rocks. No underlying bedrock was exposed in the crater or the numerous craterlets in Bonneville's walls. The crater is relatively pristine and in particular has not been affected by water based erosion.[1][2]

It is likely that Bonneville is a secondary crater, given its low depth to diameter ratio.[1]

Panorama view of Bonneville crater, the Columbia Hills to the right, the heatshield visible at the horizon

References

  1. ^ a b c Squyres; et al. (2004). "Surficial Deposits at Gusev Crater Along Spirit Rover Traverses".  
  2. ^ Golombek; et al. "Surfical geology of the Spirit rover traverse in Gusev Crater: dry and desiccating since the Hesperian" (PDF). Retrieved 2008-04-24. 

External links

  • Official Mars Rovers site
  • Astronomy Picture of the Day for March 18, 2004


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