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An Atmosphere on Ganymede from Its Occultation of SAO 186800 on 7 June 1972

Science
5 Oct 1973
Vol 182, Issue 4107
pp. 53-55

Abstract

On 7 June 1972 the third Jovian satellite Ganymede occulted the eighth-magnitude star SAO 186800. Successful photoelectric observations obtained at Lembang, Java (Indonesia), and Kavalur, India, show nonabrupt immersions and emersions, indicating the presence of an atmosphere whose surface pressure is greater than about 10-3 millibar. By fitting the two occultation durations as chords to a model disk, the diameter is found to be 5270 (+30, -∼200) kilometers, the major error contribution arising from the uncertain atmospheric thickness below the occultation layer. The derived mean density is 2.0 (-0.03, + ∼0.2) grams per cubic centimeter.

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References

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Published In

Science
Volume 182 | Issue 4107
5 October 1973

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Published in print: 5 October 1973

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R. W. Carlson
Department of Physics, University of Southern California, Los Angeles 90007
J. C. Bhattacharyya
Indian Institute of Astrophysics, Kodaikanal, India
B. A. Smith
Department of Astronomy, New Mexico State University, University Park 88001
T. V. Johnson
Jet Propulsion Laboratory, Pasadena, California 91103
B. Hidayat
Bosscha Observatory, Lembang, Java, Indonesia
S. A. Smith
California Institute of Technology, Pasadena 91109
G. E. Taylor
Royal Greenwich Observatory, Hailsham, Sussex, England
B. O'Leary
San Francisco State College, San Francisco, California 94132
R. T. Brinkmann
Lunar Science Institute, Houston, Texas 77058

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