Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92.1428m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Dec. 1986, p. 1428-1435.
Astronomy and Astrophysics
Astronomy
10
Astrometry, Astronomical Spectroscopy, Jupiter Satellites, Radiant Flux Density, Radio Spectra, Brightness Temperature, Ephemerides
Scientific paper
VLA C array configuration observations at 2 and 6 cm are presented for Europa, Ganymede, and Callisto at eastern and western elongations with respect to Jupiter, which allowed measurements in right ascension and declination of the satellites with an rms precision of about + or - 0.03 arcsec. The transfer of the mean offsets of Ganymede to Jupiter yields offsets of -0.185 + or - 0.03 arcsec and -0.06 + or - 0.03 arcsec, with respect to JPL-DE-200, at the mean epoch of April 28, 1983; the large offset in right ascension is a combination of the Jupiter ephemeris error and the error in the frame tie of the Jovian planets with the VLBI system of precise positions which was used as the absolute reference frame for the observations. A significant error is noted in the orbital position of Callisto with respect to Ganymede.
Berge Glenn L.
Muhleman Duane O.
Niell Arthur E.
Rudy Donald
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