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MAscot RAdiometer (MARA)

NSSDCA ID: 2014-076H-01

Mission Name: MASCOT
Principal Investigator:Dr. Matthias Grott


The MASCOT Radiometer (MARA) is a multi-spectral instrument that measures net radiative flux in six infrared (IR) wavelength bands. The primary scientific objectives of the MARA are to determine the brightness temperature of the surface of asteroid 162173 Ryugu; derive the thermal inertial of the asteroid; and measure surface emissivity for characterizing mineralogy.

MARA uses thermopile sensors as sensor elements. The net flux between the instrument and the surface in the 18 deg field of view is determined by evaluating the thermoelectric potential between the absorbing surface of the sensor and the cold-junction of the thermopile. MARA has four bandpass channels in the spectral range of 5.5 - 7, 8 - 9.5, 9.5 - 11.5, and 13.5 - 15.5 micron and one long pass channel that is sensitive in the spectral range greater than 3 to 100 micron. The sixth channel has a wavelength range of 8 - 12 micron and is similar to the channel used by the Thermal Infrared Imager on Hayabusa2. MARA is mounted inside the payload compartment of the MASCOT lander.

Alternate Names

  • MARA
  • MASCOT/MAscotRAdiometer(MARA)
  • urn:jaxa:darts:context:instrument:mascot.mara

Facts in Brief

Mass: 0.313 kg
Power (avg): 0.3 W
Bit rate (avg): 20 kbps

Funding Agency

  • European Space Agency (International)


  • Planetary Science: Small Bodies

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Dr. Matthias GrottPrincipal InvestigatorDeutsche Zentrum fuer Luft- und Raumfahrt (DLR)

Selected References

  • Grott, M., et al., The MASCOT Radiometer MARA for the Hayabusa 2 Mission, Space Sci. Rev., 208, No. 1-4, 413-431, doi:10.1007/s11214-016-0272-1, Jul. 2017.
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