Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991plas.rept...51h&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, 1991 p 51-52 (SEE N92-12792 03-89)
Astronomy and Astrophysics
Astronomy
Comets, Cosmic Dust, Infrared Astronomy, Infrared Telescopes, Space Observations (From Earth), Spectrophotometry, Albedo, Comet Nuclei, Comet Rendezvous Asteroid Flyby Mission, Emissivity, Heterogeneity, Mission Planning, Near Infrared Radiation, Silicates, Size Distribution
Scientific paper
Selected comets are observed in the near infrared (1 to 2.2 micron) and thermal infrared (3.5 to 20 micron) with the NASA Infrared Telescope Facility (IRTF) and other telescopes as appropriate, in order to characterize the physical properties of the dust grains; their composition, size distribution, emissivity, and albedo. Systematic variations in these properties among comets are looked for, in order to understand the heterogeneity of comet nuclei. Spectrophotometry of the 10 micron silicate emission feature is particularly emphasized. The rate of dust production from the nucleus and its temporal variability are also determined. Knowledge of the dust environment is essential to S/C design and mission planning for NASA's CRAF mission.
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