KPL/PCK Asteroid 21 Lutetia PCK File -- Radar Pole Solution 2 =========================================================================== Version and Date -------------------------------------------------------- Version 0.2 -- March 28, 2006 -- Boris Semenov, NAIF Added albedo data from [3]. Split file into four different files each containing a particular pole solution from [3]. Version 0.1 -- March 22, 2006 -- Boris Semenov, NAIF Updated pole orientation constants, rotation period and radii based on [3]. Version 0.0 -- August 13, 2004 -- Boris Semenov, NAIF Organization -------------------------------------------------------- The sections of this file are as follows. Introductory Information: -- Version description -- Disclaimer -- Sources Pck Data: -- Orientation constants for Asteroid 21 Lutetia -- Radii for Asteroid 21 Lutetia Version description -------------------------------------------------------- This is a preliminary PCK containing draft values for the pole orientation, rotation period and shape obtained from [3]. Disclaimer -------------------------------------------------------- This constants file may not contain the parameter values that you prefer. Note that this file may be readily modified by you or anyone else. NAIF suggests that you inspect this file visually before proceeding with any critical or extended data processing. NAIF requests that you update the version section if you modify the file. Sources -------------------------------------------------------- The sources for the constants listed in this file are: 1) ESA Science and Technology Server, Rosetta area, http://sci.esa.int/science-e/www/object/index.cfm? fobjectid=34849 2) JPL/HORIZONS Comet and Asteroid database 3) "The Rosetta Asteroid Targets", M. A. Barucci, Padova 31/01/2006 Orientation constants for Asteroid 21 Lutetia -------------------------------------------------------- The inertial reference frame for these constants is J2000; this is the default reference frame for PCK orientation data. The epoch of the constants is J2000; this is Julian ephemeris date (JED) 2451545.0. The NAIF integer code for Asteroid 21 Lutetia is 2000021. See the NAIF_IDs required reading for further information on NAIF integer codes. According to radar solution 2 provided in [3] the asteroid pole direction is specified by the following ecliptic longitude and latitude: lon = 48 +/- 11 deg. lat = 5 +/- 5 deg. The W1 term was set to correspond to the period of 8.17 +/- 0.01 hours ([3]). The W0 term is arbitrarily set to 0. \begindata BODY2000021_POLE_RA = ( 44.03759964 0.0 0.0 ) BODY2000021_POLE_DEC = ( 21.99001433 0.0 0.0 ) BODY2000021_PM = ( 0.0 1057.52753978 0.0 ) \begintext Radii for Asteroid 21 Lutetia -------------------------------------------------------- The radii provided in the keyword below correspond to the following asteroid shape a/b/c = 130km/104km/74km provided in [3]. \begindata BODY2000021_RADII = ( 65.0 52.0 37.0 ) \begintext Albedo Values for Asteroid 21 Lutetia -------------------------------------------------------- The albedos provided in the keywords below resulted from several different observation campaigns using different instrumentation and different wavelength. The individual values are taken from [3]. \begindata BODY2000021_ALBEDO_IRAS = 0.22 BODY2000021_ALBEDO_RADAR = 0.17 BODY2000021_ALBEDO_RADIOMETRIC = 0.11 BODY2000021_ALBEDO_POLARIMETRIC = 0.09 \begintext