Contents. planet: 6 - Saturn satellites: S12-Helene : 131, S13-Telesto : 46, S14-Calypso : 93 total number: 270 type: relative dates: 1981-1985 observatory: 809 - La Silla (ESO, Chile) 568 - Mauna Kea (CFH, Hawaii) Reference. Oberti P., Veillet C., and Catullo V. (1989) Lagrangian satellites of Tethys and Dione. I - Reduction of observations. Astronomy and Astrophysics Supplement Series. V.80. N.3. P.289-297. 1989A&AS___80__289O Informations. relative to: planet reference frame: astrometric centre of frame: topocentre epoch of equinox: 1 - date, 2 - B1950 time scale: UTC reduction: no information coordinates: X, Y diff. refraction: no information receptor: photographic telescope: Observatory ESO (Chile) - Danish reflector, D=1.54 m Observatory Mauna Kea (CFH, Hawaii) - D=3.60 m observers: Oberti P., Veillet C., Catullo V. data included in standard data file: no Comments. evaluation: The differences O-C(X)e, O-C(Y)e were also calculated by N.Emelianov with the theory by P. Oberty With these O-C one have X Y M. (mean) -0.035" 0.072" R.M.S. (root mean square) 0.432" 0.658" Format. 1. Number of satellite (N sat) 2. JD of the moment of observation (UT) 3. X=Delta(alpha)*cos(delta), arcsec 4. Y=Delta(delta), arcsec 5. epoch of equinox (N sys): 1 - date, 2 - B1950 6. O-C(X)e for X, arcsec 7. O-C(Y)e for Y, arcsec 8. Number of observatory (N obs) (809 - La Silla, 568 - Mauna Kea) ----------------------------------------------------------------- N JD (UT) N O-C(X)e O-C(Y)e sat X Y sys N arcsec arcsec arcsec arcsec obs -----------------------------------------------------------------