KPL/PCK Comet Churyumov-Gerasimenko File created by Bjoern Grieger. The direction of the rotation axis and the rotation period are based on RO-ESC-TN-5566 as of 2012-Mar-30. The phase of the rotation is chosen so that at the reference time 2014-08-07T12:00:00 TDB the axis of the rotation from J2000 to the comet fixed frame is prependicular to the z-axis. \begindata BODY1000012_POLE_RA = ( 220.0 0.0 0.0 ) BODY1000012_POLE_DEC = ( -70.0 0.0 0.0 ) BODY1000012_PM = ( -86.369364827 679.245283019 0.0 ) \begintext An ellipsoid of the same volume as the polyhedron shape model was fitted to the shape model. The optimisation criterion was maximum common volume. The smallest radius of the ellipsoid was restricted to be along the z-axis. \begindata BODY1000012_RADII = ( 2.398 1.887 1.532 ) BODY1000012_LONG_AXIS = 22.39 \begintext The term BODY1000012_LONG_AXIS is the POSITIVE WEST LONGITUDE, measured from the prime meridian, of the longest axis of the ellipsoid. SPICELIB SOFTWARE DOES NOT CURRENTLY MAKE USE OF THIS TERM !!! In order to use the ellipsoid shape model with correct orientation relative to the polyhedron shape model, an auxiliary frame with appropriate rotation relative to the body fixed frame is needed. Such a frame named 67P/C-G_ELLIPSOID is provided in the kernel ros_aux.tf. E.g., in calls to SINCPT, the name 67P/C-G_ELLIPSOID has to be passed as body-fixed, body-centered target body frame.