Contents. asteroid: (121)Hermione satellite: S/2002(121)1 total number: 14 type: position dates: 2003 - 2004 observatory: 309 - Cerro Paranal (European Southern Observatory, Chile) 568 - Mauna Kea (W.M. Keck observatory, Hawaii, USA) Reference. F. Marchis, D. Hestroffer, P. Descamps, J. Berthier, C. Laver, I. de Pater. Mass and density of Asteroid 121 Hermione from an analysis of its companion orbit. Icarus. 2005. V. 178. P. 450–464. 2005Icar..178..450M Informations. relative to: primary reference frame: astrometric ICRF centre of frame: topocentre epoch of equinox: J2000 time scale: UTC reduction: not available coordinates: X, Y (secondary relative to primary) receptor: CCD telescope: 1 - 8m VLT-UT4 telescope 2 - Keck-II telescope Comments. no Format. 1. Year of the moment of observation 2. Month of the moment of observation 3. Day of the moment of observation 4. Hour of the moment of observation 5. Minute of the moment of observation 6. Second of the moment of observation 7. Ntel - number of telescope 8. Code - Code of observatory 9. X(arcsec) - relative right ascension 10. sigmaX (arcsec) - RMS (root mean square error) 11. Y(arcsec) - relative declination 12. sigmaY (arcsec) - RMS (root mean square error) ------------------------------------------------------------- Year h Ntel Code X sigmaX Y sigmaY Month m arcsec arcsec arcsec arcsec Day s -------------------------------------------------------------