Remote sensing of a comet at millimeter and submillimeter wavelengths from an orbiting spacecraft

Samuel Gulkis, Mark Allen, Charles Backus, Gérard Beaudin, Nicolas Biver, Dominique Bockelée-Morvan, Jacques Crovisier, Didier Despois, Pierre Encrenaz, Margaret Frerking, Mark Hofstadter, Paul Hartogh, Wing Ip, Mike Janssen, Lucas Kamp, Timothy Koch, Emmanuel Lellouch, Ingrid Mann, Duane Muhleman, Heike RauerPeter Schloerb, Thomas Spilker

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The ESA Rosetta Spacecraft, launched on March 2, 2004 with the ultimate destination being Comet 67P/Churyumov-Gerasimenko, carries a relatively small and lightweight millimeter-submillimeter spectrometer instrument, the first of its kind launched into deep space. The instrument, named Microwave Instrument for the Rosetta Orbiter (MIRO), consists of a 30-cm diameter, offset parabolic reflector telescope, which couples energy in the millimeter and submillimeter bands to two heterodyne receivers. Center-band operating frequencies are near 190 GHz (1.6 mm) and 562 GHz (0.5 mm). Broadband, total power continuum measurements can be made in both bands. A 4096-channel spectrometer with 44 kHz resolution is connected to the submillimeter receiver. The spectral resolution is sufficient to observe individual, thermally broadened spectral lines (T≥10 K). The submillimeter radiometer/spectrometer is fixed tuned to measure four volatile species-CO, CH3OH, NH3 and three isotopes of water, H216O, H217O and H218O. The MIRO experiment will use these species as probes of the physical conditions within the nucleus and coma. The basic quantities measured by MIRO are surface temperature, gas production rates and relative abundances, and velocity and excitation temperature of each species, along with their spatial and temporal variability. This information will be used to infer coma structure and outgassing processes, including the nature of the nucleus/coma interface.

Original languageEnglish
Pages (from-to)1050-1057
Number of pages8
JournalPlanetary and Space Science
Volume55
Issue number9
DOIs
StatePublished - Jun 2007

Keywords

  • Comets
  • Spacecraft instruments
  • Submillimeter spectroscopy

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