Titan's Smile and Collar: HST Observations of Seasonal Change 1994-2000

Details Titan's Smile and Collar: HST Observations of Seasonal Change 1994-2000 Titan's Smile and Collar: HST Observations of Seasonal Change 1994-2000

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4453l&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 23, p. 4453-4456

Physics

28

Planetology: Fluid Planets: Atmospheres-Structure And Dynamics, Planetology: Solar System Objects: Saturnian Satellites

Scientific paper

We observed Titan with the Hubble Space Telescope in November 2000 using the Wide-Field Planetary Camera (WFPC2) and the Space Telescope Imaging Spectrograph (STIS). Considerable change is apparent between these and observations in 1994-1997 : in particular the North-South asymmetry at visible wavelengths has reversed, with the southern hemisphere brighter, as during the Voyager epoch. The asymmetry shows considerable variation with wavelength in the near-infrared : in the 889nm methane band the asymmetry (which formerly resembled a `smile') has reversed in the last 3 years, while at 953nm the southern limb is still bright. A south polar collar, dark at ultraviolet wavelengths, is apparent some five years after equinox.

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