MIMOS II

MIMOS II is the miniaturised Mössbauer spectrometer, developed by Dr. Göstar Klingelhöfer at the Johannes Gutenberg University in Mainz, Germany, that is used on the Mars Exploration Rovers Spirit and Opportunity for close-up investigations on the Martian surface of the mineralogy of iron-bearing rocks and soils.^[1]^[2]

MIMOS II uses a Cobalt-57 gamma ray source of about 300 mCi at launch which gave a 6-12 hr time for acquisition of a standard MB spectrum during the primary mission on Mars, depending on total Fe content and which Fe-bearing phases are present.^[3] Cobalt-57 has a half-life of only 271.8 days (hence the extended measuring times now on Mars after over a decade).

The MIMOS II sensorheads used on Mars are approx 9 cm x 5 cm x 4 cm^[2] and weigh about 400g^[3]

The MIMOS II system also includes a circuit board of about 100g.^[3]

References

^ Klingelhöfer G.; Bernhardt B.; Foh J.; Bonnes U.; Rodionov D.; De Souza P. A.; Schroder C.; Gellert R.; Kane S.; Gutlich P.; Kankeleit E. (2002). "The miniaturized Mössbauer spectrometer MIMOS II for extraterrestrial and outdoor terrestrial applications: A status report". Hyperfine Interactions. 144 (1): 371–379. Bibcode:2002HyInt.144..371K. doi:10.1023/A:1025444209059. S2CID 94640811.
^ ^a ^b Klingelhoefer; et al. (2007). "THE MINIATURISED MOESSBAUER SPECTROMETER MIMOS II: APPLICATION FOR THE "PHOBOS-GRUNT" MISSION" (PDF).
^ ^a ^b ^c Klingelhoefer; et al. (2003). "THE MINIATURIZED MÖSSBAUER SPECTROMETER MIMOS II OF THE ATHENA PAYLOAD FOR THE 2003 MER MISSIONS" (PDF).

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[1] Klingelhöfer G.; Bernhardt B.; Foh J.; Bonnes U.; Rodionov D.; De Souza P. A.; Schroder C.; Gellert R.; Kane S.; Gutlich P.; Kankeleit E. (2002). "The miniaturized Mössbauer spectrometer MIMOS II for extraterrestrial and outdoor terrestrial applications: A status report". Hyperfine Interactions. 144 (1): 371–379. Bibcode:2002HyInt.144..371K. doi:10.1023/A:1025444209059. S2CID 94640811.

[Kling2007-2] Klingelhoefer; et al. (2007). "THE MINIATURISED MOESSBAUER SPECTROMETER MIMOS II: APPLICATION FOR THE "PHOBOS-GRUNT" MISSION" (PDF).

[Kling2003-3] Klingelhoefer; et al. (2003). "THE MINIATURIZED MÖSSBAUER SPECTROMETER MIMOS II OF THE ATHENA PAYLOAD FOR THE 2003 MER MISSIONS" (PDF).

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v t e Mars Exploration Rover
General	Spirit rover (MER-A) Opportunity rover (MER-B) Scientific information
Spirit rover	Timeline Gusev crater Surface features visited
Opportunity rover	Timeline Meridiani Planum Argo crater Eagle crater Endeavour crater Surface features visited
Instruments	APXS Cameras (Hazcam, Navcam, Pancam, Microscopic Imager) MIMOS II Mini-TES Rock Abrasion Tool (RAT) Rover embedded computers MarsDial (Calibration Target/Plauque)
Related	Computers (IBM RAD6000) DSN JPL Maestro Rocker-bogie Rockets (Delta II Heavy) Cleaning event 37452 Spirit 39382 Opportunity Roving Mars (2006 documentary) Good Night Oppy (2022 documentary) Exploration of Mars