IAU Colloquium 168
Cometary Nuclei in Space and Time
Nanjing, China
May 18-22, 1998
Electronically-submitted Abstracts of Participants

A portrait of the Nucleus of Comet Hale-Bopp (1995 O1) from HST and ISO observations
P.L.Lamy(1), L.Jorda(2), I.Toth(3), H.Weaver(4), and M.F.A'Hearn(5)
(1) Laboratoire d'Astronomie Spatiale, Marseille, France (2) Max-Planck-Institute für Aeronomie, Germany (3) Konkoly Observatory, Hungary (4) The Johns Hopkins University, Baltimore, MD, USA (5) Department of Astronomy, University of Maryland, MD, USA

Comet 1995O1 Hale-Bopp has been observed with the Planetary Camera of the Hubble Space Telescope from October 1995 to October 1996 and with the high resolution mode of ISOCAM (IFOV of 1.5 arcsec) of the ISO satellite in early October 1996. The HST images have been obtained with the BVR filters and the ISOCAM images, with several filters covering the 6-15 microns spectral domain. In all cases the achieved spatial resolution allows to discriminate the signal from the nucleus from that of the coma in the central pixels of the cometary images. Various technics have been applied to extract the nucleus and they give results in satisfactory agreement. We shall present a complete portrait of the nucleus of comet 1995O1 Hale-Bopp from those observations: size, spectral reflectivity, temperature and infrared emissivity.


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