Long Term Changes in the Reflectivity of Uranus

Details Long Term Changes in the Reflectivity of Uranus Long Term Changes in the Reflectivity of Uranus

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.1801s&link_type=abstract

American Astronomical Society, DPS meeting #36, #18.01; Bulletin of the American Astronomical Society, Vol. 36, p.1103

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Photoelectric magnitude measurements of Uranus made during the last 77 years through the Johnson V passband (peak wavlength = 540 nm, bandpass = 85 nm) are presented. Hardie and Giclas (1955) applied color corrections to magnitude measurements of Uranus made before 1955; additional magnitude data for this study were taken from Appleby and Irvine (1971), from Schmude (2002) and from unpublished data. Between 1991 and 2003, Uranus dimmed by about 0.06 magnitudes. Larger brightness changes than in the 1990s were measured during the first 60 years of the 20th century. Since the polar flattening of Uranus is only about 0.02, it is concluded that the brightness changes measured on Uranus during the last 77 years are primarily due to changes in the reflectivity of Uranus' atmosphere.
Appleby, J. F. and Irvine, W. M. (1971) Astron. J. 76, 617; Hardie, R. H. and Giclas, H. L. (1955) Astrophys. J. 122, 460; Schmude, R. W. Jr. (2002) The Strolling Astonomer 44, 22.

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