Recent Views of Neptune's South Polar Collar

Details Recent Views of Neptune's South Polar Collar Recent Views of Neptune's South Polar Collar

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5005r&link_type=abstract

American Astronomical Society, DPS meeting #40, #50.05; Bulletin of the American Astronomical Society, Vol. 40, p.488

Astronomy and Astrophysics

Astronomy

Scientific paper

Since the time of Voyager, and throughout the Hubble era, Neptune has displayed a dark latitude band at 55-70°S at wavelengths of 400-500 nm (i.e. Voyager Blue, WFPC2 F467M). This dark band brightened by 7% between 1994 and 2004, similar to the brightness increase of the planet as a whole in Strömgren b (Hammel and Lockwood 2007, Icarus 186, 291-301), but has remained nearly constant in morphology and relative contrast. In particular, it has consistently extended to latitudes of 50°S in one hemisphere of Neptune, while remaining southward of 60°S in the opposite hemisphere (e.g. Sromovsky et al. 2001, Icarus 149, 459-488). We will examine the brightness, relative contrast, and morphology of this band in observations made with the Hubble Space Telescope since 2003, and will consider the variations in atmospheric scatterers which may be responsible.
We acknowledge support from the Space Telescope Science Institute and the NASA Planetary Atmospheres Program.

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