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Astron. Astrophys. Suppl. Ser.
Volume 136, Number 3, May I 1999
Page(s) 445 - 451
Published online 15 May 1999
DOI: 10.1051/aas:1999226

Astron. Astrophys. Suppl. Ser. 136, 445-451

CCD observations of Nereid and a new orbital determination[*][*]

C.H. Veiga1, R. Vieira Martins1, and Cl. Le Guyader2

1 - Observatório Nacional, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil
e-mail: or
2 - Institut de Mécanique Céleste et de Calcul des Éphémérides, 77 avenue Denfert-Rochereau F-75014 Paris, France

Received September 14, 1998; accepted January 8, 1999


229 CCD positions of Nereid taken between 1993 and 1998 are presented. Many of the observations were taken near the periapsis. Considering also the other published positions we have a good distribution of the observations on the eccentric orbit of the satellite. Using a numeric integration method we fitted all these observations in order to determine one state vector for the orbit. The observed minus calculated standard deviation for all observations is 0$.\!\!^{\prime\prime}$23, and for our observations it is 0$.\!\!^{\prime\prime}$16.

Key words: astrometry -- planets and satellites: Nereid

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