Contents. planet: 7 - Uranus satellites: U1-Ariel : 139, U2-Umbriel : 131, U3-Titania : 127, U5-Miranda : 117 total number: 514 type: relative dates: 1990-1991 observatory: 950 - La Palma Reference. Jones D. H. P., Taylor D. B., and Williams I. P. (1998) Astrometry of satellites I to V of Uranus 1990-1991. Astronomy and Astrophysics Supplement. V. 130. P. 77-80. 1998A&AS__130___77J Informations. relative to: U2-Umbriel: 1, U3-Titania: 10, U4-Oberon :128 reference frame: astrometric centre of frame: topocentre epoch of equinox: J2000 time scale: UTC reduction: Catalogue PPM coordinates: X, Y diff. refraction: no information receptor: CCD telescope: Jacobus Kapteyn Telescope observers: Jones D. H. P., Taylor D. B., Williams I. P. data included in standard data file: no Comments. no information Format. 1. Number of plate 2. JD-2400000.5, with decimals 3. Number of Satellites Observed 4. Number of Reference Satellite 5. Seeing (FWHM), arcsec (SG) 6. Number of first satellite measured 7. X, arcsec (first satellite measured - Reference Satellite) 8. Y, arcsec (first satellite measured - Reference Satellite) 9. Number of second satellite measured 10. X, arcsec (second satellite measured - Reference Satellite) 11. Y, arcsec (second satellite measured - Reference Satellite) 12. Number of third satellite measured 13. X, arcsec (third satellite measured - Reference Satellite) 14. Y, arcsec (third satellite measured - Reference Satellite) 15. Number of fourth satellite measured 16. X, arcsec (fourth satellite measured - Reference Satellite) 17. Y, arcsec (fourth satellite measured - Reference Satellite) ------------------------------------------------------------------------------------------------------------- N JD-2400000.5 N N SG N X Y N X Y N X Y N X Y plate sats ref arcsec sat1 arcsec arcsec sat2 arcsec arcsec sat3 arcsec arcsec sat4 arcsec arcsec -------------------------------------------------------------------------------------------------------------