Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...212.1392s&link_type=abstract
Science, vol. 212, June 19, 1981, p. 1392.
Physics
10
Jupiter (Planet), Natural Satellites, Spaceborne Photography, Voyager Project, Image Processing, Jupiter Atmosphere, Occultation, Jupiter, 1979J3, Satellites, Discovery, Voyager 1, Photographs, Orbits, Observations, Shadows, Voyager 2, Properties, Period, Distance, Radius, Shape, Diameter, Albedo
Scientific paper
During a detailed search of Voyager 1 frames for additional observations of the satellite 1979J1, two small dark spots were observed in transit in several consecutive wide-angle frames of the Jovian atmosphere. The size, spacing, and motion of these pairs of dark spots indicated that they were the images of 1979J1 and its shadow. Subsequent analysis of images spanning 6 days, however, proved that the satellite observed in these Voyager 1 frames would have been occulted by Jupiter at the times of the Voyager 2 images of 1979J1 and was, therefore, a new satellite. It was subsequently found in transit on Voyager 2 images within 13 deg of the Voyager 1 prediction. Its period is 7 hrs 4 min 30 sec + or - 3 sec, and its mean distance is 1.793 Jupiter radii (Jupiter radius = 71,400 km). The observable profile appears to be roughly circular with a diameter of 40 km, and the albedo is approximately 0.05, similar to Amalthea's.
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