Contents. planet: 8 - Neptune satellites: N1-Triton : 28 total number: 28 type: relative dates: 1975-1977 observatory: 689 - U.S. Naval Observatory, Flagstaff Reference. Walker R. L., Christy J. W., Harrington R. S. (1978) Positions of planets and natural satellites Astronomical Journal. V. 83. N. 7. P. 838-844. 1978AJ_____83__838W Informations. relative to: planet reference frame: astrometric centre of frame: topocentre epoch of equinox: Date time scale: UTC reduction: Catalog SAO coordinates: X, Y diff. refraction: excluded receptor: photographic telescope: Reflector, D=155 cm observers: Walker R. L.,Christy J. W., Harrington R. S. data included in standard data file: no Comments. no information Format. 1. Year of the moment of observation 2. Month of the moment of observation 3. Day of the moment of observation with decimals 4. X, arcsec 5. Y, arcsec --------------------------------- Year X Y month day arcsec arcsec ---------------------------------