Titan's smile and collar : HST observations of seasonal change 1994-2000

被引：47

作者：

Lorenz, RD ^{[1
]}

Young, EF

Lemmon, MT

机构：

[1] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[2] SW Res Inst, Boulder, CO USA

[3] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 23期

关键词：

D O I：

10.1029/2001GL013728

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：4453 / 4456

页数：4

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