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Catalogue POP – Notice individuelle de publication

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

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

Planetary and Space Science, 2007, vol. 55, pp. 1050-1057

Référence DOI : 10.1016/j.pss.2006.11.011
Référence ADS : 2007P&SS...55.1050G

Résumé :

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, CH <SUB>3</SUB>OH, NH <SUB>3</SUB> and three isotopes of water, H <SUB>2</SUB><SUP>16</SUP>O, H <SUB>2</SUB><SUP>17</SUP>O and H <SUB>2</SUB><SUP>18</SUP>O. 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.

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