Titan's surface and rotation: New results from Voyager 1 images

James Richardson, Ralph D. Lorenz, Alfred McEwen

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

We present an analysis of images of Saturn's moon Titan, obtained by the Voyager 1 spacecraft on November 8-12, 1980. Orange filter (590-640 nm) images were photometrically corrected and a longitudinal average removed from them, leaving residual images with up to 5% contrast, and dominated by surface reflectivity. The resultant map shows the same regions observed at 673 nm by the Hubble Space Telescope (HST). Many of the same albedo features are present in both datasets, despite the short wavelength (600 nm) of the Voyager 1 images. A very small apparent longitudinal offset over the 14 year observation interval places tight constraints on Titan's rotation, which appears essentially synchronous at 15.9458±0.0016 days (orbital period =15.945421±0.000005 days). The detectability of the surface at such short wavelengths puts constraints on the optical depth, which may be overestimated by some fractal models.

Original languageEnglish (US)
Pages (from-to)113-124
Number of pages12
JournalIcarus
Volume170
Issue number1
DOIs
StatePublished - Jul 1 2004

Keywords

  • Atmosphere
  • Image processing
  • Satellites
  • Surface
  • Titan

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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