Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981avest..15...25l&link_type=abstract
(Astronomicheskii Vestnik, vol. 15, Jan.-Mar. 1981, p. 25-31.) Solar System Research, vol. 15, no. 1, July 1981, p. 19-24. Tran
Astronomy and Astrophysics
Astronomy
8
Amphitrite Asteroid, Asteroids, Astronomical Photometry, Brightness Distribution, Light Curve, Ubv Spectra, Carbonaceous Chondrites, Planetary Rotation, Silicates
Scientific paper
The light curves, phase dependences, and values of the opposition effect for the asteroids Fortuna and Amphitrite were obtained from observations in August-November 1978. The values of the absolute stellar magnitude and colors are V(1,0) = 7.14m, B-V = 0.71m, and U-B = 0.30m for Fortuna and V(1,0) = 5.83m, B-V = 0.82m, and U-B = 0.47m for Amphitrite. The diameters were refined: 272 km for Fortuna and 240 km for Amphitrite. It is shown that, contrary to data available in the literature, the surface of Fortuna is photometrically uniform in color. A brightness increase of about 0.08m (secondary maximum) is recorded on the phase curve of Fortuna in the region of alpha = 6-8 deg, which may be explained by the rainbow effect, i.e., by light scattering on large spherical particles having an index of refraction of 1.73
Chernova G. P.
Kiselev Nikolai N.
Lupishko Dmitrij F.
Tupieva F. A.
Velichko Feodor P.
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