Content asteroid: (42355)Typhon satellite: Echidna total number: 5 type: position dates: 2006-2006 observatory: 250 - Hubble Space Telescope (HST) Reference Grundy W.M., Noll K.S., Virtanen J., Muinonen K., Kern S.D., Stephens D.C., Stansberry J.A., Levison H.F., Spencer J.R. (42355) Typhon-Echidna: Scheduling observations for binary orbit determination. Icarus. 2008. V. 197. Issue 1. P. 260-268. 2008Icar..197..260G Informations relative to: primary reference frame: astrometric ICRF centre of frame: topocentre epoch of equinox: J2000 time scale: UTC reduction: not available coordinates: r, R, g, X, Y (secondary relative to primary) receptor: CCD telescope: HST HRC/ACS (High-Resolution Camera of the Advanced Camera for Surveys) Comment: 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 with decimals 5. r(au) - the distance from the Sun to the target 6. R(au) - the distance from the observer to the target 7. g(deg) - the phase angle, the angular separation between the observer and Sun as seen from the target 8. X(arcsec) - relative right ascension. 9. sigma(X)(arcsec) - 1-sigma uncertainties X 10. Y(arcsec) - relative declination 11. sigma(Y)(arcsec) - 1-sigma uncertainties Y ------------------------------------------------------------------------------------ Year Day hour r R g X sigma(X) Y sigma(Y) Month AU AU deg arcsec arcsec arcsec arcsec ------------------------------------------------------------------------------------