Other
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...69..354t&link_type=abstract
Icarus (ISSN 0019-1035), vol. 69, Feb. 1987, p. 354-369. NASA-supported research.
Other
14
Asteroids, Light Curve, Planetary Rotation, Poles, Astronomical Models, Electrophotometry, Asteroids, Herculina, Lightcurves, Models, Photoelectric Methods, Period, Rotation, Magnitude, Color, Optical Properties, Astrometry, Amplitude, S Asteroids, Procedure, Analysis, Diagrams, Polar Regions
Scientific paper
Photoelectric lightcurves of 532 Herculina in 1984 show two maxima and two minima with a synodic rotation period of 0.39185±0.00002 day (1σ). During some other oppositions the Herculina lightcurve has only one maximum and one minimum over that same rotation period. The absolute magnitude in V is 6.13±0.02 mag, the phase coefficient in V is 0.037±0.002, and the mean colors are B-V = +0.86±0.04 and U-B = +0.43±0.02. The authors applied photometric astrometry and the results indicate a sidereal period of 0.3918711±0.0000001 day with retrograde rotation for a north pole at 276° long and +1° lat. The uncertainty of the pole is ±1°. A model of Herculina is presented that generates lightcurves consistent with both the observed amplitudes and the timings of extrema over precisely 28,630 sidereal rotations during 30 years.
Birch Peter V.
Drummond Jack
Pospieszalska-Surdej A.
Surdej Jean
Taylor Charles R.
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