Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jalpo..51a..25s&link_type=abstract
Journal of the Association of Lunar & Planetary Observers, The Strolling Astronomer (ISSN 0039-2502), Vol. 51, No. 1, p. 25 - 31
Astronomy and Astrophysics
Astronomy
Mars, Observations, Photometry, Polarization
Scientific paper
The writer made 123 Johnson V filter brightness measurements of Mars between February 26, 2007 (Ls = 191 °) and June 25, 2008 (Ls = 90 °). In addition to this, he made 59 whole-disc polarization measurements of that planet between 2005 and 2008 in light with a wavelength between 0.42 and 0.86 μm. This report summarizes these measurements. The findings of this study are: Mars' brightness was close to what Mallama's model predicted; the average observed minus predicted magnitude between December 1, 2007 and March 31, 2008 was 0.009 ± 0.002 magnitudes. Secondly, dust deposited by the planet-encircling dust storm in the summer of 2007 caused little or no change in Mars' brightness. Thirdly, Mars reflected about the same amount of polarized light (at λ = 0.54 μm) in nearly dust-free conditions during the 2003, 2005 and 2007 apparitions. Fourthly, the amount of polarized light dropped with increased wavelength roughly in proportion to λ-4 in nearly dust-free conditions, and finally, the October 2005 dust clouds had different polarization characteristics than those in September 2001.
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