Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989newsc.122...39h&link_type=abstract
New Scientist (ISSN 0262-4079), vol. 122, April 29, 1989, p. 39-44.
Astronomy and Astrophysics
Astronomy
Pluto, Astronomy, Atmosphere, Photographs, Aircraft Observations, Charon, Occultations, Diagrams, Interior, History, Gravity Effects, Planet X, Satellites, Pluto-Charon System, Earth-Based Observations, Size, Mass, Physical Properties, Telescope Methods, Density, Composition, Brightness, Core, Surface, Comparisons, Mapping, Water Ice, Methane, Infrared, Haze, Orbits
Scientific paper
Pluto was first telescopically sought in April, 1929 by Clyde Tombaugh, and identified in January of the following year. A history is presented of Pluto research to the present, which has led to the discovery of the Pluto moon Charon, as well as to the characterization of Pluto with respect to size, density, composition, etc. Charon, at 1192 km diameter, is almost exactly half the 2284 km diameter of Pluto. The mutual occultations of Pluto and Charon have permitted astronomers to map their surface features by accurately measuring the total light from the system and subjecting the rates of surface-darkening obtained to computer analysis. An atmospheric composition primarily consisting of methane has been determined.
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