Heat Shield Rock

Discovery

Opportunity encountered the meteorite entirely by chance, in the vicinity of its own discarded heat shield (hence the name). Opportunity had been sent to examine the heat shield after exiting the crater Endurance. This was the first meteorite found on another planet and the third found on another Solar System bodytwo others, the millimeter-sized Bench Crater and Hadley Rille meteorites, were found on the Moon.

Analysis

The rock was initially identified as unusual in that it showed, from the analysis with the Mini-TES spectrometer, an infrared spectrum that appeared unusually similar to a reflection of the sky. In-situ measurements of its composition were then made using the APXS, showing the composition to be 93% Iron, 7% nickel, with trace amounts of germanium (~300 ppm) and gallium (

No attempt was made to drill into the meteorite using the Rock Abrasion Tool (RAT), because testing on iron meteorites on Earth showed that the rover's drilling tools would be abraded and damaged. The RAT was designed to drill into ordinary rock, not into iron-nickel alloy. Meridiani Planum, the part of Mars where this meteorite was found, is suspected to have once been covered by a layer of material with a thickness of as much as 1 km which has been subsequently eroded. However no evidence suggests when it impacted. To survive impact largely undeformed it must have impacted at less than ~1.5 km/s, which sets boundaries on its entry dynamics and Mars' atmosphere at the time it impacted. In any case, the meteorite did not show much sign of rust. In the absence of detailed knowledge of the Mars environment, it is not possible to conclude whether it fell recently or not.

Other nickel-iron meteorites found on Mars

Following the identification of Heat Shield Rock as a meteorite, five similar iron meteorites were discovered by Opportunity (informally named "Block Island", "Ireland" "Mackinac Island", "Oileán Ruaidh" and "Shelter island"). Two nickel-iron meteorites were identified by the Spirit rover (informally named "Allan Hills" and "Zhong Shan"). One nickel-iron meteorite has been identified by the Curiosity rover, tagged "Lebanon." In addition, several candidate stony meteorites have also been identified on Mars.

Terminology

The term "Martian meteorite" usually refers to something entirely different: meteorites on Earth which are believed to have originated from Mars, a famous example being ALH84001.

Gallery

File:Heat Shield Rock 1.jpg File:Heat Shield Rock.jpg File:Heat Shield Rock, Mars.jpg File:Opportunity - meteorito.png File:Heat Shield Rock2.jpg

References

References

1. The Meteoritical Society, Guidelines For Meteorite Nomenclature, 2.2 Distinctive names [http://www.lpi.usra.edu/meteor/docs/nc-guidelines.htm#s22]
2. (December 2011). "Meteorites at Meridiani Planum provide evidence for significant amounts of surface and near-surface water on early Mars". Meteoritics & Planetary Science.
3. NASA, [http://mars.jpl.nasa.gov/multimedia/images/?ImageID=6433 Curiosity Finds Iron Meteorite on Mars], July 15, 2014 (accessed September 3, 2014)
4. "Mars Meteorites". [[Jet Propulsion Laboratory]].
5. "Meteoritical Bulletin Database: Allan Hills 84001".