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Post-perihelion monitoring of comet Hale-Bopp at ESO

Boehnhardt, H. and Bonfils, X. and Petit, Y. and Hainaut, O. and Delahodde, C. and Jorda, L. and Rauer, H. and Colas, F. and Manfroid, J. and Marchis, F. and Schulz, R. and Tanabe, R. and Tozzi, G.P. (2002) Post-perihelion monitoring of comet Hale-Bopp at ESO. In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany, 500, pp. 613-616. ESA. Asteroids, Comets, Meteors – ACM 2002, Berlin, Gernany, 29 July - 2 August 2002. ISBN 92-9092-810-7.

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Abstract

The post-perihelion coma activity of Comet C/1995 O1 Hale-Bopp is monitored at ESO telescopes in La Silla and Paranal since Sept. 1997. Imaging through broadband filters in the visible and near-IR wavelength ranges allows to investigate the evolution of the dust coma, namely the appearance of jets, fans, shells and clouds. Long-term evolution: the comet had a porcupine-like embedded fan coma in autumn 1997 that evolved into a northern fan plus shell pattern in 1998 and remains like this since. Thus, the evolution of the coma structure post-perihelion was similar to that pre-perihelion at about the same heliocentric distances, but is occurred in reversed order. This long-term evolution can be characterized by quasi-continuous dust emission from a few (minimum 4) active regions (producing the fan structures) on the nucleus that is modulated by occasional, repetitive and short-term activity increases (generating shell features in the coma). Outbursts: a number of outbursts and unusual activity patterns occurred in the coma of the comet post-perihelion that are documented through the appearance of complex "palm-tree-like" structures of temporary nature in association with outbursts in the visual lightcurve of the comet and a series of 3 dust clouds resembling "mini-comets" and passing through the northern coma at projected velocities of 30-50m/s. The similarity of coma patterns and cometary viewing geometry from Earth before and after perihelion suggests that some nuclear regions had enhanced long-term activity, possibly driven by super-volatile ices at larger (>10AU) heliocentric distances and that the orientation of the rotation axis of the nucleus did not change much over the past 7 years.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2003,
Title:Post-perihelion monitoring of comet Hale-Bopp at ESO
Authors:
AuthorsInstitution or Email of Authors
Boehnhardt, H.European Southern Observatory ESO, Santiago de Chile
Bonfils, X.European Southern Observatory ESO, Santiago de Chile
Petit, Y.European Southern Observatory ESO, Santiago de Chile
Hainaut, O.European Southern Observatory ESO, Santiago de Chile
Delahodde, C.INSU Astrophysical Laboratiry, Marseille, France
Jorda, L.INSU Astrophysical Laboratiry, Marseille, France
Rauer, H.UNSPECIFIED
Colas, F.Observatoire de Paris-Meudon, Meudon, France
Manfroid, J.University Liege, Institute for Astrophysics and Geophysics, Plainevaux, Belgium
Marchis, F.University of Berkeley, Department of Astronomy, Berkeley, USA
Schulz, R.ESTEC, Noordwijk, The Netherlands
Tanabe, R.National Astronomical Observatory, Mitaka, Tokyo, Japan
Tozzi, G.P.Osservatorio Astrofisico di Arcetri, Firenze, Italy
Date:2002
Journal or Publication Title:Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany
Volume:500
Page Range:pp. 613-616
Editors:
EditorsEmail
Warmbein, B.UNSPECIFIED
Publisher:ESA
Series Name:ESA SP
ISBN:92-9092-810-7
Status:Published
Event Title:Asteroids, Comets, Meteors – ACM 2002, Berlin, Gernany, 29 July - 2 August 2002
Organizer:ESA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institut für Weltraumsensorik und Planetenerkundung
Deposited By: Susanne Pieth
Deposited On:08 Dec 2005
Last Modified:14 Jan 2010 19:26

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