Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jalpo..37..116s&link_type=abstract
Association of Lunar and Planetary Observers, Journal (ISSN 0039-2502), vol. 37, no. 3, p. 116-119
Astronomy and Astrophysics
Astronomy
1
Brightness, Color, Magnitude, Planetary Composition, Uranus (Planet), Uranus Atmosphere, Albedo, Astronomical Photometry, Electrophotometers, Phase Shift
Scientific paper
Four people submitted a total of 79 photometric measurements of Uranus in 1992, resulting in these normalized magnitudes: U(1,0) = -6.39 +/- 0.06, B(1,0) = -6.57 +/- 0.02, V(1,0) = -7.17 +/- 0.02, R(1,0) = -6.98 +/- 0.02 and I(1,0) = -6.07 +/- 0.09. Twenty-seven V(1,0) measurements, uncorrected for phase angle, were plotted against the solar phase angle and the solar phase angle coefficient (mv) was found to equal 0.004 magnitude/degree which is close to the literature value. The brightness of Uranus was estimated visually with four different comparison stars and small discrepancies were found (approximately 0.1 mag) which are attributed to differences in the star colors. Visual observations suggest that Uranus had a greenish color in mid-1992 and that there were faint albedo variations on the disk.
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