Ground-Based Thermal Infrared Observations of Comet Hale-Bopp (C/1995 O1) During 1996
- 28 March 1997
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 275 (5308) , 1907-1909
- https://doi.org/10.1126/science.275.5308.1907
Abstract
Thermal infrared (IR) imaging and spectroscopy of comet Hale-Bopp (C/1995 O1) during June, August, and September 1996 traced the development of the dust coma several months before perihelion. Images revealed nightly variations in the brightness of the inner coma from 1 to 12 June that were correlated with the appearance of a northward-pointing jet. The central IR flux increased by a factor of 8 between 1 June and 30 September, and the September data showed IR jets that corresponded to similar structures that were visible in reflected sunlight at shorter wavelengths. At all epochs, 8- to 13-micrometer spectra of the central coma revealed a strong silicate emission feature, including an 11.2-micrometer feature indicative of crystalline olivine, even when the comet was at a heliocentric distance of 4.1 astronomical units.Keywords
This publication has 6 references indexed in Scilit:
- The 8-13 micron spectra of comets and the composition of silicate grainsThe Astrophysical Journal, 1994
- SpectroCam-10: a 10-μm spectrograph/camera for the Hale TelescopePublished by SPIE-Intl Soc Optical Eng ,1993
- The infrared light curve of Periodic Comet Halley 1986 III and its relationship to the visual light curve, C2, and water production ratesThe Astronomical Journal, 1993
- 8- to 13-μm spectroscopy of Comet Levy 1990 XXIcarus, 1992
- The identification of crystalline olivine in cometary silicatesThe Astrophysical Journal, 1989
- Thermal emission from the dust coma of comet bowell and a model for the grainsIcarus, 1986