ISO spectroscopic observations of short-period comets

Details ISO spectroscopic observations of short-period comets ISO spectroscopic observations of short-period comets

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..161c&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 161

Computer Science

29

Comets, 22P/Kopff, 103P/Hartley 2, Dust, Molecules, Spectroscopy

Scientific paper

Two Infrared Space Observatory programmes (guaranteed time and open time) were devoted to high-resolution spectroscopic observations of short-period comets. 22P/Kopff was observed on October-December 1996 with SWS and LWS. Due to the weakness of the object, only the ν3 ro-vibrational lines of water were detected, with SWS. Comet 103P/Hartley 2 was observed close to its perihelion (at 1.04 AU from Sun and 0.82 AU from Earth) on January 1998 with SWS, LWS and CAM. The bands of H2O and CO2 at 2.7 and 4.3 μm are detected, with [CO2]/[H2O] = 10 %. The 2.7 μm band of H2O is observed with a high signal-to-noise ratio with SWS, which permits to evaluate the rotational temperature of water to 16-20 K and its ortho-to-para ratio to ~ 2.7, corresponding to a spin temperature of ~ 35 K. The 5-17 μm spectrum of comet Hartley 2 observed with CAM-CVF shows the 9-12 μm signature of silicates. Silicate emission around 10 μm is present at a level of about 20 % of the continuum, with a peak at 11.3 μm indicative of crystalline silicates. This is the first time crystalline silicates are found in a short-period comet. The ISO observations of the Jupiter-family comet P/Hartley 2, presumably originating from the Edgeworth-Kuiper belt, are compared to those of comet Hale-Bopp which came from the Oort cloud.

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