Spectral diversity among the nuclei of comets

Details Spectral diversity among the nuclei of comets Spectral diversity among the nuclei of comets

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..104..138l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 104, no. 1, p. 138-148.

Other

57

Astronomical Spectroscopy, Chemical Composition, Comet Nuclei, Spectrum Analysis, Asteroids, Charge Coupled Devices, Planetary Composition, Reflectance, Solar System Evolution

Scientific paper

CCD spectra of bare cometary nuclei and nucleus candidates are presented and compared. The nucleus colors in the present sample range from -3 percent/1000 A to 20 percent/1000 A, while the candidate colors range from -13 percent/1000 A to 46 percent/1000 A. The distributions of the colors of cometary nuclei and cometary candidates are similar. P/Giacobini-Zinner shows a downturn feature in the blue reminiscent of chondritic spectra. No other absorption features were evident in the rest of the observed nuclei and nucleus candidates at the 10-20 A resolution level. The nuclei of the observed low-activity comets (Tempel 2, Arend-Rigaux, Giacobini-Zinner, and Chiron) are likely to possess Type 2 'rubble mantles', which are by-products of sublimation. Their diverse colors thus represent a characteristic of the rubble mantle.

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