Worldwide photometry and lightcurve observations of 16 Psyche during the 1975-1976 apparition

Details Worldwide photometry and lightcurve observations of 16 Psyche during the 1975-1976 apparition Worldwide photometry and lightcurve observations of 16 Psyche during the 1975-1976 apparition

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...54...30t&link_type=abstract

Icarus (ISSN 0019-1035), vol. 54, April 1983, p. 30-37. Research supported by NASA and Government of Western Australia.

Astronomy and Astrophysics

Astronomy

19

Asteroids, Light Curve, Spectrophotometry, Ubv Spectra, Least Squares Method, Magnitude, Topography, Asteroids, 16 Psyche, Lightcurves, Photometry, Astronomy, Observations, Apparitions, Periods, Magnitude, Wavelengths, Ultraviolet, Infrared, Rotation

Scientific paper

Twenty-six lightcurves of Psyche are presented together with UBV photometry and phase functions from 1975 and 1976. Combining photometric data from this opposition with those from previous apparitions resulted in a mean phase coefficient in V of 0.026 + or - 0.002 mag/deg. No significant phase-dependent variation in the U-B color could be determined from the data; the B-V color, however, displayed a reddening with phase of 0.0010 + or - 0.0004 mag/deg. It is concluded that compositional variations over Psyche's surface are minor, and that Psyche's opposition effect is typical of that for other well-observed asteroids. Psyche's behavior is accounted for if, to the first order, its shape is that of a triaxial ellipsoid with axial ratios near 5:4:3.

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