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Asteroid 532 Herculina - Lightcurves, pole orientation and a modelWhile photoelectric lightcurves obtained for 532 Herculina in 1984 exhibit two maxima and two minima, the lightcurve has shown only one maximum and one minimum over the same rotation period in some other oppositions. The use of photometric astronomy yields a sidereal period of 0.3918711 + or 0.0000001 day, with a retrograde rotation for the north pole at 276 deg longitude and +1 deg latitude. A model consisting of a sphere with two dark regions that are each about 0.13 times the brightness of the surrounding surface is developed for Herculina, and it is shown that its generated lightcurves are consistent with both the observed amplitudes and the timings of extrema over the 28,630 sidereal rotations of 30 years. The lightcurves for the next four oppositions are predicted on the basis of the photometric astrometry pole and the two dark region model.
Document ID
19870049350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Taylor, R. C.
(Arizona, University Tucson, United States)
Birch, P. V.
(Perth Observatory Bickley, Australia)
Drummond, J.
(Steward Observatory Tucson, AZ, United States)
Pospieszalska-Surdej, A.
(Liege, Universite Belgium)
Surdej, J.
(Liege, Universite; FNRS, Brussels, Belgium)
Date Acquired
August 13, 2013
Publication Date
February 1, 1987
Publication Information
Publication: Icarus
Volume: 69
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Accession Number
87A36624
Distribution Limits
Public
Copyright
Other

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