Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197..327s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 327-330.
Astronomy and Astrophysics
Astronomy
6
Asteroids, Astronomical Photometry, Planet Ephemerides, Planetary Rotation, Satellite Surfaces, Asteroids, Loreley, Rotation, Period, Lightcurves, Amplitude, Surface, Shape, Photometry, Magnitude, Axis, Astronomy
Scientific paper
165 Loreley is one of the last large asteroids (D greater than or equal to 150 km) whose rotational properties have not yet been determined. For this reason it was observed during the 1981 and 1984 oppositions, in a collaborative campaign involving the Torino Observatory and the Institut fuer Astronomie, Graz, Austria. From three observing nights a rotational period P(syn) = 7.22 + or - 0.01 h was determined and this value, together with the peculiar light variation trend exhibited in 1981, were confirmed by the 1984 single lightcurve. The total amplitude of the lightcurve, which seems to be partially controlled by surface irregularities that are present on a (not very) elongated ellipsoidal body, is 0.16 + or - 0.01 mag. V(1, alpha) magnitudes were derived for each observing night and the resulting color indices are B - V = 0.681 + or - 0.008 and U - B = 0.255 + or - 0.004.
Cellino Alberto
di Martino Mario
Schober Hans Josef
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