Photographic positional observations of Saturn

Details Photographic positional observations of Saturn Photographic positional observations of Saturn

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1974p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, June 1990, p. 1974-1984.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photography, Position (Location), Saturn (Planet), Astronomical Observatories, Error Analysis, Saturn Satellites, Saturn, Astronomy, Astrometry, Position (Location), Photography, Data, Techniques, Procedure, Earth-Based Observations, Rings, Satellites, Comparisons

Scientific paper

Positional observations of Saturn are obtained with two photographic techniques and over 200 exposures of Saturn and its satellites taken between 1974 and 1980 with the USNO 26-in. refractor. The first method derives the center of Saturn's image from measurements of its rings. The second method indirectly derives the center from measurements of Saturn's satellites. The observations are compared to the Jet Propulsion Laboratory ephemeris of Saturn, DE 125 (Standish, 1985) to determine the external error of the observations. It is found that the external error in right ascensions is + or - 0.2 arcsec, while the declination error is + or - 0.27 arcsec.

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