Phase relations of high albedo asteroids - The unusual opposition brightening of 44 NYSA and 64 Angelina

Details Phase relations of high albedo asteroids - The unusual opposition brightening of 44 NYSA and 64 Angelina Phase relations of high albedo asteroids - The unusual opposition brightening of 44 NYSA and 64 Angelina

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...81..365h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 81, Oct. 1989, p. 365-374.

Astronomy and Astrophysics

Astronomy

48

Albedo, Asteroids, Light Curve, Phase Shift, Planetary Surfaces, Saturn Rings, Space Observations (From Earth), Asteroids, Astronomy, Albedo, Brightness, Nysa, Angelina, Opposition, Photoelectric Methods, Optical Properties, Lightcurves, Data, Rings, Photometry, Phase Angles, Atmosphereless Bodies, Earth-Based Observations, Porosity, Surface, Shadows, Saturn, Particles, Hypotheses, Theoretical Studies

Scientific paper

The present photoelectric lightcurve observations of 44 Nysa at one aspect, and 64 Angelina at both polar aspects, indicate the presence of an opposition spike or brightening of approximately 0.25 mag within several deg of zero-phase angle. Since the three curves are identical within the bounds of observational scatter, the opposition spike cannot be judged anomalous within the asteroid taxonomic class E. The general similarity of the observed phase curves to those of the Uranian satellites and the rings of Saturn supports the status of the spike as an ordinary property of moderate-to-high albedo atmosphereless surfaces.

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