Midcourse Space Experiment Observations of Small Solar System Bodies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Comets: Individual: Name: Hyakutake (C/1996 B2), Comets: Individual: Name: Tabur (C/1996 Q1), Comets: Individual: Name: 126P/Iras, Comets: Individual: Name: 22P/Kopff, Comets: Individual: Name: 46P/Wirtanen, Comets: Individual: Name: 3200 Phaethon), Comets: Individual: Name: 107P/Wilson-Harrington, Comets: Individual: Name: 125P/Spacewatch, Comets: Individual: Name: 55P/Tempel-Tuttle, Infrared: Solar System, Minor Planets, Asteroids

Scientific paper

Eight comets, two transition objects (extinct comet candidates), and two near-Earth asteroids were imaged in four infrared bands with the SPIRIT III instrument on the Midcourse Space Experiment, namely, C/1996 B2 (Hyakutake), C/1995 O1 (Hale-Bopp), C/1996 Q1 (Tabur), 126P/IRAS, 22P/Kopff, 46P/Wirtanen, (3200) Phaethon, (4015) 107P/Wilson-Harrington, (4179) Toutatis, (4197) 1982 TA, 125P/Spacewatch, and 55P/Tempel-Tuttle. We present maps of each object detected and a description of their characteristics. Five of the comets had extended dust tails, all of which show evidence for silicate emission in the 8.3 μm band. The comet C/Hyakutake had a strong secondary dust tail along the direction of the comet's motion, which the dynamical models showed was consistent with emission from large particles. The dust trail from P/Kopff was detected more than 2° from the coma in three of the four bands and is probably composed of large particles emitted during the 1996 apparition.

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