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

Carlson, R. W. and Bhattacharyya, J. C. and Smith, B. A. and Johnson, T. V. and Hidayat, B. and Smith, S. A. and Taylor, G. E. and O'Leary, B. and Brinkmann, R. T. (1973) An Atmosphere on Ganymede from Its Occultation of SAO 186800 on 7 June 1972. Science, 182 (4107). pp. 53-55. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20151106-140900578

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.182.4107.53DOIArticle
http://www.sciencemag.org/content/182/4107/53PublisherArticle
http://www.jstor.org/stable/1736235JSTORArticle
Additional Information:© 1973 American Association for the Advancement of Science. Received 30 April 1973; revised 12 July 1973. We acknowledge with thanks the special efforts of W. Brunk and others at the National Aeronautics and Space Administration in granting funds for the American expeditions on short notice (under NASA grant NGR 05-036-005 with B.O. as principal investigator and coordinator of results). T.V.J. is a National Research Council resident research associate. We also thank B. J. Harris of Perth Observatory, Australia, and J. Churms and T. W. Russo of Capetown Observatory, South Africa, for providing the photographic plates used in refining the predictions; D. T. Vu for supplying photoelectric data; U.S. Information Service personnel at the U.S. Embassy in Jakarta and G. Edwards of the Australian News and Information Bureau for their assistance in the American expeditions; and C. Durrington, Qantas Airlines, and British Overseas Airline Company for their special help in getting the necessary equipment to Darwin, Australia.
Funders:
Funding AgencyGrant Number
NASANGR 05-036-005
Issue or Number:4107
Record Number:CaltechAUTHORS:20151106-140900578
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151106-140900578
Official Citation:An Atmosphere on Ganymede from Its Occultation of SAO 186800 on 7 June 1972 R. W. Carlson, J. C. Bhattacharyya, B. A. Smith, T. V. Johnson, B. Hidayat, S. A. Smith, G. E. Taylor, B. O'Leary, and R. T. Brinkmann Science 5 October 1973: 182 (4107), 53-55. [DOI:10.1126/science.182.4107.53]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61963
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Nov 2015 00:08
Last Modified:03 Oct 2019 09:13

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