NSSDCA ID: PSSB-02806
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
====================================================================== Data Set history: ====================================================================== First version ====================================================================== Data Set Overview: ====================================================================== The data from the Rosetta Navigation Camera (NavCam) were calibrated by Bernhard Geiger; the processing pipeline was implemented by Rafael Andres; the data set was constructed and submitted by Diego Fraga Agudo on behalf of the Planetary Science Archives (PSA). The data were acquired between 2016-07-26 and 2016-08-09. The frequency of navigation slots was one 2x2 raster every five hours, with interruption by manoeuvres. 264 navigation and 4 calibration images were taken, which gives a total of 268 images. There were no more context images. Rows were lost for one navigation image due to ground station problems. The spacecraft performed four 14x8km elliptical orbits with a 20 degree tilt with respect to the terminator plane. Hence the phase angle ranged between 70 and 110 degrees. All images in this data set are radiometrically calibrated data taken using the imaging mode. The data set contains images using NavCam CAM1 onboard the Rosetta S/C. NavCam instrument contains a second identical camera called CAM2 but this was used mainly as a backup and the few images taken with it have not been calibrated and are not included in the Level 3 datasets. The images can be found in the DATA/CAM1 directory. For each image, the user can also find the FITS format of the observation in the EXTRAS/CAM1 directory. ====================================================================== Filename Convention: ====================================================================== In DATA: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs><X>.<EXT> ROS CAM1 YYYYMMDDThhmmss C IMG CAM2 Q LBL Where X can be C, Q or be absent. It is present for level 3 data (C for image and label file, Q for quality map). It is absent for level 2 products. Examples: ROS_CAM1_20160308T154502C.IMG ROS_CAM1_20160308T154502Q.IMG ROS_CAM1_20160308T154502C.LBL In BROWSE: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs>C.<EXT> ROS CAM1 YYYYMMDDThhmmss PNG CAM2 LBL Examples: ROS_CAM1_20160308T154502C.PNG ROS_CAM1_20160308T154502C.LBL In EXTRAS: The filenaming convention for all data levels is given by: <mission>_<CAMx>_<begin time of obs>CF.<EXT> ROS CAM1 YYYYMMDDThhmmss FIT CAM2 LBL Where C indicates it is a calibrated image file and F indicates it is in FITS format. Examples: ROS_CAM1_20160308T154502CF.FIT ROS_CAM1_20160308T154502CF.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-3-ext3-mtp032-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 |