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Title:
Thermal-infrared and visual imaging of comet Giacobini-Zinner
Authors:
Telesco, C. M.; Decher, R.; Baugher, C.; Campins, H.; Mozurkewich, D.; Thronson, H. A.; Cruikshank, D. P.; Hammel, H. B.; Larson, S.; Sekanina, Z.
Affiliation:
AA(NASA, Marshall Space Flight Center, Huntsville, AL), AB(NASA, Marshall Space Flight Center, Huntsville, AL), AC(NASA, Marshall Space Flight Center, Huntsville, AL), AD(Science Applications International Corp., Tucson, AZ), AE(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AF(Wyoming Infrared Observatory, Laramie, WY), AG(Hawaii, University, Honolulu), AH(Hawaii, University, Honolulu), AI(Arizona, University, Tucson, AZ), AJ(California Institute of Technology, Jet Propulsion Laboratory, Pasadena)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. L61-L65. (ApJL Homepage)
Publication Date:
11/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GIACOBINI-ZINNER COMET, INFRARED IMAGERY, THERMAL EMISSION, ALBEDO, ASTRONOMICAL MAPS, COSMIC DUST, SPATIAL DISTRIBUTION
DOI:
10.1086/184782
Bibliographic Code:
1986ApJ...310L..61T

Abstract

Thermal-infrared and visual images obtained simultaneously of comet Giacobini-Zinner on UT 1985 August 4.4 are presented. The 10.8-micron map, which spans several arc minutes with 8-arcsec resolution, is the first ground-based infrared image of a comet. Considerable spatial structure is evident in the map, including a curved dust tail consisting primarily of dust grains larger than 100 microns. The width of this large-grain tail implies that these grains depart the nucleus with velocities less than 3 m/s. The distribution of grain albedo is determined for the central 1 arcmin. It is speculated that an observed increase in the albedo by a factor of 2 with distance from the nucleus and prolonged radius vector results from the confinement to the orbital plane of large fluffy grains previously considered for GZ by others; the lower albedo of this dust could result from multiple internal scattering increasing the probability of absorption of incident light. It is estimated that dust was departing the nucleus at the rate of about 8 x 10 to the 5th g/s, comparable to that derived for many other comets.

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