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Infrared observations of Comet Austin (1990 V) by the COBE/Diffuse Infrared Background ExperimentComet Austin was observed by the Cosmic Background Explorer (COBE)/Diffuse Infrared Background Experiment (DIRBE) with broadband photometry at 1-240 micrometers during the comet's close passage by Earth in 1990 May. A 6 deg long (6 x 10(exp 6) km) dust tail was found at 12 and 25 micrometers, with detailed structure due to variations in particle properties and mass-loss rate. The spectrum of the central 42 x 42 sq arcmin pixel was found to agree with that of a graybody of temperature 309 +/- 5 K and optical depth 7.3 +/- 10(exp -8). Comparison with IUE and ground-based obervations indicates that particles of radius greater than 20 micrometers predominate by surface area. A mass-loss rate of 510 (+510/-205) kg/s and a total tail mass of 7 +/- 2 x 10(exp 10) kg was found for a model dust tail composed of Mie spheres with a differential particle mass distribution dn/d log m approx. m(exp -0.63) and 2:1 silicate:amorphous carbon composition by mass.
Document ID
19950038199
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lisse, C. M. (Hughes STX, Greenbelt, MD United States)
Freudenreich, H. T. (Hughes STX, Greenbelt, MD United States)
Hauser, M. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelsall, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moseley, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Reach, W. T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Silverberg, R. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
September 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 432
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other