Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...54..371s&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 54, Nov. 1983, p. 371-378.
Astronomy and Astrophysics
Astrophysics
5
Asteroids, Astronomical Photometry, Electrophotometry, Light Curve, Planetary Rotation, Color, Magnitude, Periodic Variations, Time Measurement, Ubv Spectra
Scientific paper
Results of photoelectric observations of the asteroid 201 Penelope carried out at the European Southern Observatory and Perth Observatory during the 1980 opposition of the asteroid between October 6 and November 7 are presented. Observations were made in the standard UBV and Geneva systems at ESO, and in V-prime at Perth. Examination of composite light curves shows the presence of two distinct maxima and two distinct minima, with a total amplitude of the V light curve of 0.52 magnitudes. A mean synodic rotation period of 3 h, 44 min, 51.6 + or - 7.4 sec is derived. Using a mean phase coefficient betaV = 0.037 mag/deg, a primary V (1,0) maximum of 8.51 + or - 0.01 magnitudes is obtained. Color indices are measured as B-V = 0.70 + or - 0.01 and U-B = 0.23 + or - 0.02 magnitudes, and previously reported color variations (Surdej and Cramer, 1980) are attributed to a failure in the reduction procedure.
Barbier R.
Birch Peter V.
Cramer Noel
Louis Bill
Rufener F.
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