Contents. planet: 8 - Neptune satellites: N2-Nereid : 5 total number: 5 type: relative dates: 1987-1987 observatory: 809 - European Southern Observatory, La Silla Reference. Landgraf W. (1988) Neptune II (Nereid). IAU Circ. N 4542. P. 1. 1988IAUC_4542____1L Informations. relative to: 0 - Neptune 1 - Triton reference frame: astrometric centre of frame: topocentre epoch of equinox: 1950.0 time scale: UTC reduction: no information coordinates: X, Y diff. refraction: no information receptor: photographic telescope: 1 - reflector, D = 2.2 m 2 - GPO observers: Landgraf W. data included in standard data file: no Comments. Format. 1. Number of satellite (N sat) 2. Number of reference body (0 - Neptune, 1 - Triton) 3. Year of the moment of observation 4. Month of the moment of observation 5. Day of the moment of observation with decimals, 5. X, arcsec 6. Y, arcsec 7. Number of telescope (N tel, see above) ------------------------------------------------------ N N Year UT sat. ref. month day with X Y N body decimals arcsec arcsec tel ------------------------------------------------------