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Analysis of the Light-Curve of Comet P/Halley in 1985–1986

Published online by Cambridge University Press:  12 April 2016

David Valls-Gabaud  and
Angel Gómez
David Valls-Gabaud
Affiliation:
Agrupación Astronómica de Madrid, Apartado 1039, E-28080 MadridSpain Institut d’Astrophysique de Paris 98 bis, Bid. Arago, F-75014 Paris, France
Angel Gómez
Affiliation:
Agrupación Astronómica de Madrid, Apartado 1039, E-28080 MadridSpain

Extract

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We analize the light curve of comet P/Halley resulting from 187 observations made by amateurs. We try to derive some constraints on the physical properties of the comet through the application of the semi-empirical photometric model (SEPM) developped by R.L. Newburn.

The m1 (Fig. 2) and V(1,0) light curves show a clear transition phase in the pre-perihelion apparition, between ~ 1.9 and ~ 1.2 A.U. which supports the division into 3 parts made by Hasegawa. It is remarkable to find that the light curve obtained by amateurs is so close to those obtained by experienced observers.

We derive an effective equivalent radius of β = 4.9 ± 0.8 (1σ) km, and a geometrical albedo of pυ = 0.06 ± 0.02 (1σ) using the method suggested by Delsemme and Rud.

Type
Part III Observations and Results
Information
International Astronomical Union Colloquium , Volume 98: Stargazers: The Contribution of Amateurs to Astronomy , 1988 , pp. 160 - 162
Copyright
Copyright © Springer-Verlag 1988