Wideband Photometry of Saturn: 1995-2007

Details Wideband Photometry of Saturn: 1995-2007 Wideband Photometry of Saturn: 1995-2007

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2601s&link_type=abstract

American Astronomical Society, DPS meeting #39, #26.01; Bulletin of the American Astronomical Society, Vol. 39, p.460

Astronomy and Astrophysics

Astronomy

Scientific paper

The writer has measured the brightness of Saturn + rings at four wavelengths (0.44 to 0.86 microns) every year since 1995 using a single channel photometer. Filters transformed to the Johnson B, V, R and I system were used in all measurements. The main conclusions of this 12 year study are:
1) The color of Saturn + rings does not change in visible light as the solar phase angle drops from 6 to 2 degrees.
2) The color of Saturn + rings becomes a few percent bluer in visible light as the solar phase angle drops below 1.0 degree due to the opposition surge.
3) In visible wavelengths, the color of Saturn + rings does not change as the ring tilt changes from 4 to 27 degrees.
4) The R-I color index value increases by about 0.1 magnitudes as the ring tilt angle rises from 4 to 27 degrees. The opening of the rings is probably the cause of this change.
5) The solar phase angle coefficient of Saturn + rings is 0.027 magnitude/degree for a ring tilt angle of 14 degrees and it rises by about 0.0005 magnitude/degree for each 1 degree increase in ring tilt angle and it drops by about the same amount for each 1 degree drop in ring tilt angle.
The writer would like to thank Gordon College for providing financial support for attending this meeting.

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