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Astron. Astrophys. 315, L385-L388 (1996)

The infrared spectrum of comet C/1995 O1 (Hale-Bopp) at 4.6 AU from the Sun*

J. Crovisier1, T.Y. Brooke2, M.S. Hanner2, H.U. Keller3, P.L. Lamy4, B. Altieri5, D. Bockelée-Morvan1, L. Jorda1,3,4, K. Leech5, and E. Lellouch1

1 Observatoire de Paris-Meudon, F-92195 Meudon, France
2 Jet Propulsion Laboratory, Pasadena, California 91109, USA
3 MPI für Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Germany
4 Laboratoire d'astrophysique spatiale, Les trois Lucs, F-13012 Marseille, France
5 ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, Spain

Received 11 July 1996 / Accepted 31 July 1996

Abstract. Comet C/1995 O1 (Hale-Bopp) was observed on 27 April 1996 with the ISOPHOT instrument of ISO when it was at 4.6 AU from the Sun. The 2.5-12 img1.gifm spectrum was recorded at low resolution. We present here the preliminary results of this observation. The 2.5-5  img1.gifm spectrum shows emission in the CO2 img3.gif band. The CO2 production rate is about img4.gif s-1. The 6-12  img1.gifm spectrum shows thermal emission at a colour temperature of 162 K (6-8  img1.gifm range) and a strong silicate band around 10  img1.gifm, with a narrow feature at 11.2  img1.gifm indicative of crystalline silicates.

Key words: comets: general - comet: individual: C/1995 O1 (Hale-Bopp) - infrared: solar system

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with participation of ISAS and NASA.

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