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Title:
Ground-based infrared observations of comet Halley
Authors:
Hayward, T. L.; Gehrz, R. D.; Grasdalen, G. L.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Wyoming Infrared Observatory, Laramie), AC(Minnesota, University, Minneapolis)
Publication:
Nature (ISSN 0028-0836), vol. 326, March 5, 1987, p. 55-57. Research supported by the University of Wyoming, University of Minnesota, NSF, USAF, and NASA. (Nature Homepage)
Publication Date:
03/1987
Category:
Astrophysics; Comets
Origin:
STI; LPI [AN-870115%J]
NASA/STI Keywords:
COMET NUCLEI, GIOTTO MISSION, HALLEY'S COMET, INFRARED ASTRONOMY, ASTRONOMICAL MODELS, COMETARY ATMOSPHERES, PARTICLE EMISSION, PLASMA JETS
LPI Keywords:
COMETS, HALLEY, EARTH-BASED OBSERVATIONS, INFRARED, WAVELENGTHS, COLOR, PHOTOMETRY, TEMPERATURE, EMISSIONS, SILICATE, BRIGHTNESS, COMPARISIONS, JETTING, PARTICLES, COMPOSITION, HYPOTHESES, DISTRIBUTION, LUMINOSITY, MODELS, PROCEDURE, IMAGERY, CALCULATIONS, OPTICAL PROPERTIES, GRAINS, CLATHRATE TEXTURE
DOI:
10.1038/326055a0
Bibliographic Code:
1987Natur.326...55H

Abstract

The authors present ground based 2 - 23 μm photometry and 10.3 μm imaging of Halley taken within hours of the Giotto spacecraft encounter. The photometry shows a colour temperature of 360K and silicate emission features at 10 and 20 μm, and the image shows jet activity similar to that observed by Giotto, but on a scale of thousands of km. The expected 10 μm surface brightness, based on the particle mass distribution measured by Giotto and assuming solid, spherical grains, is a factor of six lower than the observed value. It is suggested that fluffy particles could remove this discrepancy.
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