Short-wavelength infrared (1.3-2.6 μm) observations of the nucleus of Comet 19P/Borrelly

Details Short-wavelength infrared (1.3-2.6 μm) observations of the nucleus of Comet 19P/Borrelly Short-wavelength infrared (1.3-2.6 μm) observations of the nucleus of Comet 19P/Borrelly

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..167..100s&link_type=abstract

Icarus, Volume 167, Issue 1, p. 100-112.

Computer Science

22

Comet, Temperature, Thermal Emission, Imaging Spectrometer, Short-Wavelength Infrared, Swir, Jhk Color, Nitrogen-Bearing Organic Molecules, H-K Color, J-H Color, Infrared Spectra, Spectral Absorption, Nucleus, Short-Period Comets, 19P/Borrelly, Borrelly, Deep Space 1

Scientific paper

During the last two minutes before closest approach of Deep Space 1 to Comet 19P/Borrelly, a long exposure was made with the short-wavelength infrared (SWIR) imaging spectrometer. The observation yielded 46 spectra covering 1.3-2.6 μm the footprint of each spectrum was ~160 m × width of the nucleus. Borrelly's highly variegated and extremely dark 8-km-long nucleus exhibits a strong red slope in its short-wavelength infrared reflection spectrum. This slope is equivalent to J-K and H-K colors of ~0.82 and ~0.43, respectively. Between 2.3-2.6 μm thermal emission is clearly detectable in most of the spectra. These data show the nucleus surface to be hot and dry; no trace of H2O ice was detected. The surface temperature ranged continuously across the nucleus from <=300 K near the terminator to a maximum of ~340 K, the expected sub-solar equilibrium temperature for a slowly rotating body. A single absorption band at ~2.39 μm is quite evident in all of the spectra and resembles features seen in nitrogen-bearing organic molecules that are reasonable candidates for compositional components of cometary nuclei. However as of yet the source of this band is unknown.

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