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Title:
Evidence for water ice and estimate of dust production rate in comet Hale-Bopp at 2.9 AU from the Sun
Authors:
Lellouch, E.; Crovisier, J.; Lim, T.; Bockelee-Morvan, D.; Leech, K.; Hanner, M. S.; Altieri, B.; Schmitt, B.; Trotta, F.; Keller, H. U.
Affiliation:
AA( Observatoire de Paris-Meudon, F-92195 Meudon, France), AB( Observatoire de Paris-Meudon, F-92195 Meudon, France), AC(ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, Spain; Queen Mary & Westfield College, University of London, London, UK), AD( Observatoire de Paris-Meudon, F-92195 Meudon, France), AE(ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, Spain), AF(Jet Propulsion Laboratory, Pasadena, CA 91109, USA), AG(ISO Science Operations Centre, Astrophysics Division of ESA, Villafranca, Spain), AH(Laboratoire de Glaciologie et Geophysique de l'Environnement, Saint Martin d'Heres, France), AI(Laboratoire de Glaciologie et Geophysique de l'Environnement, Saint Martin d'Heres, France), AJ(MPI fuer Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Germany)
Publication:
Astronomy and Astrophysics, v.339, p.L9-L12 (1998) (A&A Homepage)
Publication Date:
11/1998
Origin:
A&A
A&A Keywords:
COMETS: GENERAL, COMET: INDIVIDUAL: C/1995 O1 (HALE-BOPP), INFRARED: SOLAR SYSTEM
Bibliographic Code:
1998A&A...339L...9L

Abstract

We report observational evidence for water ice in comet C/1995 O1 (Hale-Bopp) when it was at 2.9 AU from the Sun, from emission features at 44 and 65 mu m, and possibly an absorption feature at 3.1 mu m, observed with ISO/LWS and PHT. We find that icy grains have mean radii of 15 mu m within a factor of 2, lifetimes of ~ 2 days, a temperature of ~ 153 K, and a total mass of ~ 2x10(9) kg. From investigation of the continuum spectrum at 43-195 mu m, we also infer a production rate of large particles ( ~ 100 mu m) dust of about 4x10(4) kg s(-1) . 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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