First Earth-based observations of Neptune's satellite Proteus

Details First Earth-based observations of Neptune's satellite Proteus First Earth-based observations of Neptune's satellite Proteus

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262l..13c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. L13, L14.

Astronomy and Astrophysics

Astrophysics

13

Celestial Mechanics, Neptune Satellites, Space Observations (From Earth), Solar System, Uranus Satellites

Scientific paper

Proteus (Neptune III) was discovered from Voyager Spacecraft images in 1989 (Smith, 1989). It was never observed from ground-based observatories because of its magnitude (m = 20.3) and closeness to Neptune (maximum elongation = 6 arcsec). In October 1991, we used the 2.2 m telescope at the European Southern Observatory (La Silla, Chile) to look for it. The observation success is mainly due to the use of an anti blooming CCD and to good seeing conditions (less than 1 arcsec). We give the differential positions of Proteus referred to Neptune and we compare with theoretical positions issued from Voyager's data (Owen et al., 1991). We found that the rms orbital residual was about 0.1 arcsec.

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