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Astron. Astrophys. 322, 679-686 (1997)

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The opposition effect of 51 Nemausa *

Leif Kahl Kristensen and Peter Gammelgaard

Institute of Physics and Astronomy, University of Aarhus, Bygn. 520, DK-8000 Aarhus C, Denmark

Received 3 October 1996 / Accepted 3 December 1996


From three nights of uvby-observations of 51 Nemausa in September 1994, covering solar phase angle 0 [FORMULA] 64 to 1 [FORMULA] 37, the phase factor as a function of rotational phase was determined to vary in the range 0.05 to 0.13 mag/deg. The large values are due to the opposition effect. An ephemeris for physical observations facilitated the reductions and allowed a certain identification of minor details with the 1983 and 1990 lightcurves. The difficulties connected with the development of lightcurves in Fourier series are discussed. The advantage of a statistical analysis in terms of uncorrelated normal points is demonstrated.

Key words: asteroids – methods: data analysis – methods: individual: 51 Nemausa

* Based on observations made with the Danish 1.54m telescope at the European Southern Observatory, La Silla, Chile

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998