Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..233s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 1, April 1990, p. 233-237.
Astronomy and Astrophysics
Astronomy
3
Asteroids, Light Curve, Planetary Rotation, Astronomical Photometry, Variability, Asteroids: Photometry, Asteroids: Rotation, Asteroids: 714 Ulula, Asteroids, Asteroids, S Asteroids, Lightcurve, Ulula, Amplitude, Period, Color, Earth-Based Observations, Photoelectric Methods, Optical Proeprties, Shape, Astronomy, Rotation, Absolute Magnitude, Data
Scientific paper
The S-type asteroid 714 Ulula with a diameter of 41.0 km (IRAS) was observed photoelectrically during four nights in January 1983 at ESO, Chile. We have derived a complete double mode lightcurve with a maximum amplitude of 0.55 mag, a rotation period of P = 7h.000±0h.005 (0d.2917 ±0d.0002) and color indices with B-V 0.89±0.02 and U-B = 0.42±0.04 in close agreement with Bowell et al. (1979).
Using a G value of 0.250 we have derived H0 replacing the old V0 (1, 0), the absolute magnitude of the primary maximum, with H0 = 9.15. Asteroid 714 Ulula seems to be an unusually irregular object as far as the large lightcurve amplitude for asteroids in the diameter range of 31 to 60km is concerned.
Schober Hans Josef
Stadler Michael
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