Astron. Astrophys. Suppl. Ser. 143, 405-407

Astrometric photographic observations of Helene

C.H. Veiga - R. Vieira Martins

Send offprint request: C.H. Veiga

Observatório Nacional, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil
e-mail: cave@on.br or rvm@on.br

Received November 16, 1999; accepted January 19, 2000

Abstract:

Astrometric photographic positions of the Saturnian satellite Helene obtained from 22 plates taken in 6 nights are presented. The observations are distributed between 5 missions in 1985 and 1987. All positions are compared with those calculated by Jacobson (1999). The residuals have mean and standard deviation smaller than $0\hbox{$.\!\!^{\prime\prime}$ }25$ and $0\hbox{$.\!\!^{\prime\prime}$ }30$ respectively.

Key words: astrometry -- planets and satellites -- Saturn