NSSDCA ID: PSSB-01256
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
====================================================================== Data Set Overview: ====================================================================== The data from the Rosetta Navigation Camera (NavCam) was extracted by Bernhard Geiger; the data set was constructed and submitted by Maud Barthelemy on behalf of the Planetary Science Archives (PSA). The data have been observed and measured from 9th Aug 2016 to 2nd Sep 2016. The frequency of the navigation slots was of one image every hour, with interruption by manoeuvre slots and WAC imaging. 292 navigation images were taken. There was 1 lost navigation image and 1 with lost rows, both due to bad weather at the ground station. The orbiter was in elliptical orbits with a 20 degrees tilt with respect to the terminator plane, i.e. the phase angle ranged between 70 and 110 degrees. The pericentre was gradually reduced and the apocentre increased while maintaining a constant orbital period of 3 days: 13.7km, 7.5km, 13.7km, 6.7km, 14.4km, 6.0km, 15.1km, 5.5km, 15.5km, 5.0km, 15.9km, 4.6km, 16.2km, 4.4km, 16.4km. All images in this data set are raw and uncalibrated data taken using the imaging mode. The data set contains images resolved using both NavCams onboard the Rosetta S/C and the DATA directory is organised to reflect this with two sub directories: - CAM1 - CAM2 CAM2 directory is only present if CAM2 observations are done. After hibernation exit CAM2 was only switched on to confirm its health status in a check-out. During the comet escort phase CAM2 will only be used in the case of a failure of the nominal camera CAM1. For each image, the user can also find the FITS format of the observation in the EXTRAS directory. ====================================================================== Filename Convention: ====================================================================== In DATA: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs>.<EXT> ROS CAM1 YYYYMMDDThhmmss IMG CAM2 LBL Examples: ROS_CAM1_20140223T081016.IMG ROS_CAM1_20140223T081016.LBL ROS_CAM2_20140223T094017.IMG ROS_CAM2_20140223T094017.LBL In BROWSE: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs>.<EXT> ROS CAM1 YYYYMMDDThhmmss JPG CAM2 LBL Examples: ROS_CAM1_20140223T081016.LBL ROS_CAM1_20140223T081016.JPG ROS_CAM2_20140223T094017F.LBL ROS_CAM2_20140223T094017.JPG In EXTRAS: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs>F.<EXT> ROS CAM1 YYYYMMDDThhmmss FIT CAM2 LBL Examples: ROS_CAM1_20140223T081016F.FIT ROS_CAM1_20140223T081016F.LBL ROS_CAM2_20140223T094017F.FIT ROS_CAM2_20140223T094017F.LBL ====================================================================== Geometry Information - Coordinate System: ====================================================================== The label files include the following geometric variables: - SC SUN POSITION VECTOR: The vector from the spacecraft to the Sun in equatorial J2000 inertial frame. - SC TARGET POSITION VECTOR: The vector from the spacecraft to the centre of the comet nucleus in equatorial J2000 inertial frame. - SC TARGET VELOCITY VECTOR: The spacecraft to comet nucleus velocity vector in in equatorial J2000 inertial frame. - TARGET CENTER DISTANCE: The distance between the spacecraft and the comet nucleus centre. (Note that also for checkout and stellar calibration images the comet nucleus distance is given here.) - SUB SPACECRAFT LATITUDE and SUB SPACECRAFT LONGITUDE: The latitude and longitude of the sub-spacecraft point derived from the Flight Dynamics body-fixed reference frame implicitly specified by the information provided in the comet attitude file CATT. - RIGHT ASCENSION and DECLINATION: Right Ascension and Declination of the camera boresight direction in equatorial J2000 inertial frame. - CELESTIAL NORTH CLOCK ANGLE: The direction of celestial north at the center of the image - measured from the upward direction, clockwise to the direction toward celestial north. - SOLAR ELONGATION: The angle between the line of sight of observation and the direction of the Sun. All geometric values are calculated for the time t = IMAGE TIME (and not START TIME). ======================================================================
These data are available on-line from the Planetary Data System (PDS) at:
https://pdssbn.astro.umd.edu/holdings/ro-c-navcam-2-ext3-mtp033-v1.0/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Bernhard Geiger | General Contact | European Space Agency | Bernhard.Geiger@esa.int |