Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..151s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 151-155.
Astronomy and Astrophysics
Astronomy
1
Asteroids, Electrophotometry, Planetary Rotation, Ubv Spectra, Astronomical Photometry, Light Curve, Asteroids, C Asteroids, Ursula, Rotation, Astronomy, Photometry, Period, Occultations, Earth-Based Observations, Lightcurves, Amplitude, Shape, Characteristics, Physical Properties, Magnitude, Optical Properties, Color, Telescope Methods, Analysis
Scientific paper
The large C-type asteroid 375 Ursula with a diameter of 216±10 km (Millis et al., 1984) was observed photo-electrically in UBV in August 1981. It is one of the very few asteroids with a diameter larger than 200 km for which no rotation rate was known. From three consecutive observing nights the rotation period of P = 16h.83±0h.07 corresponding to 0d.701±0d.003 was derived. The resulting light curve shows double mode wave structure with primary and secondary extrema and a total amplitude of 0.17 mag. This proves that 375 Ursula is not totally spherical as suggested by Millis et al. (1984). Absolute magnitude and colors are derived to be V(1,0) = 7.63±0.01 (for the primary maximum), B-V = 0.66±0.05 and U-B = 0.29±0.06.
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