Continuum Observations of Asteroid (2867) Steins With the MIRO Millimeter and Submillimeter Instrument on Rosetta

Details Continuum Observations of Asteroid (2867) Steins With the MIRO Millimeter and Submillimeter Instrument on Rosetta Continuum Observations of Asteroid (2867) Steins With the MIRO Millimeter and Submillimeter Instrument on Rosetta

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p12a..05g&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #P12A-05

Physics

6205 Asteroids

Scientific paper

The European Space Agency Rosetta Spacecraft passed within 802 km of the asteroid (2867) Steins on September 5, 2008, on its long journey to Comet 67P/Churyumov-Gerasimenko which will be encountered in 2014. The Rosetta Spacecraft carries a number of scientific instruments including a relatively small and lightweight millimeter and submillimeter instrument, the first of its kind launched into deep space. The instrument, named MIRO (Microwave Instrument for the Rosetta Orbiter), consists of a 30-cm diameter, offset parabolic reflector telescope followed by two heterodyne receivers. Center-band operating frequencies of the receivers are near 190 GHz (1.6 mm) and 562 GHz (0.5 mm). Broadband continuum channels are implemented in both frequency bands for the measurement of near surface temperatures and temperature gradients in two asteroids, (2867) Steins and (21) Lutetia, and Comet 67P/Churyumov-Gerasimenko. A 4096 channel CTS (Chirp Transform Spectrometer) spectrometer having 180 MHz total bandwidth and 44 kHz resolution is, in addition to the continuum channel, connected to the submillimeter receiver. We present the continuum observations of Asteroid (2867) Steins obtained during the flyby with the MIRO instrument. Thermal models and radiative transfer calculations will be presented to deduce near surface (regolith) physical properties of (2867) Steins. The work at the Jet Propulsion Laboratory, California Institute of Technology was supported by NASA.

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