Data Set Information
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DATA_SET_NAME |
ROSETTA-ORBITER 67P NAVCAM 2 COMET ESCORT 2 MTP014 V1.0
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DATA_SET_ID |
RO-C-NAVCAM-2-ESC2-MTP014-V1.0
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NSSDC_DATA_SET_ID |
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DATA_SET_TERSE_DESCRIPTION |
This dataset contains ROSETTA NAVCAM RAW
DATA of the Escort Phase. Included are
ESC2-MTP014 data from 10 Mar 2015 to 8 Apr
2015.
|
DATA_SET_DESCRIPTION |
======================================================================
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 10th March 2015 to 8th
Apr 2015. The frequency of the navigation slots was of one 2x2 raster
every five hours, with interruption by manoeuvres. This gave 512
navigation images. In addition, 53 context images have been taken and
2 calibration images. This makes a total of 567 images.
After the safe mode at 2015-03-29T12:15 a series of 7 planned rasters
(28 images) was not executed. 4 navigation images were taken with lost
rows at 2015-03-29T05 (large antenna off-pointing due to star tracker
problems and gyro drift).
5 context images at the beginning of the MTP were not acquired due to
a too late file submission, 4 additional ones were taken with
different properties for that reason. 74 NCIR images were not executed
after the safe mode at 2015-03-29T12:15 until the end of the MTP.
There were no context images with lost rows.
The orbiter was executing far fly-by arcs with distances between 70 km
and 100km This fly-by was followed by a close fly by at 13:00 on 28th
March 2015 at 15km from the comet centre and 40 degrees phase angle.
The spacecraft went to Safe Mode on 29th March due to severe Star
Tracker issues. The spacecraft was sent to 400km. On 8th April, it
went back to 140km.
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.
======================================================================
Filename Convention:
======================================================================
The filenaming convention for all data levels is given by:
__.
ROS CAM1 YYYYMMDDThhmmss IMG
CAM2 LBL
(JPG)
Examples:
ROS_CAM1_20140223T081016.IMG
ROS_CAM1_20140223T081016.LBL
ROS_CAM1_20140223T081016F.FIT
ROS_CAM1_20140223T081016F.LBL
(ROS_CAM1_20140223T081016.JPG)
ROS_CAM2_20140223T094017.IMG
ROS_CAM2_20140223T094017.LBL
ROS_CAM2_20140223T094017F.FIT
ROS_CAM2_20140223T094017F.LBL
(ROS_CAM2_20140223T094017.JPG)
(In the case of the BROWSE directory)
======================================================================
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).
======================================================================
|
DATA_SET_RELEASE_DATE |
2015-10-31T00:00:00.000Z
|
START_TIME |
2015-03-10T11:25:00.000Z
|
STOP_TIME |
2015-04-08T11:25:00.000Z
|
MISSION_NAME |
INTERNATIONAL ROSETTA MISSION
|
MISSION_START_DATE |
1995-03-01T12:00:00.000Z
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MISSION_STOP_DATE |
N/A (ongoing)
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TARGET_NAME |
CALIBRATION
67P/CHURYUMOV-GERASIMENKO 1 (1969 R1)
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TARGET_TYPE |
CALIBRATION
COMET
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INSTRUMENT_HOST_ID |
RO
|
INSTRUMENT_NAME |
NAVIGATION CAMERA
|
INSTRUMENT_ID |
NAVCAM
|
INSTRUMENT_TYPE |
CCD CAMERA
|
NODE_NAME |
Small Bodies
|
ARCHIVE_STATUS |
IN LIEN RESOLUTION
|
CONFIDENCE_LEVEL_NOTE |
All data have been validated by
ESA and found as expected. Any exceptions are noted by
the DATA_QUALITY field in the label files.
|
CITATION_DESCRIPTION |
Geiger, B. and M. Barthelemy,
ROSETTA ORBITER NAVCAM ESC2-MTP014, RO-C-NAVCAM-2-ESC2-MTP014-V1.0,
ESA Planetary Science Archive and NASA Planetary Data System, 2015.
|
ABSTRACT_TEXT |
This dataset contains ROSETTA NAVCAM RAW
DATA of the Escort Phase 2 from 10th Mar
2015 to 8th Apr 2015 when at the vicinity
of target 67P/CG.
|
PRODUCER_FULL_NAME |
BERNHARD GEIGER
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SEARCH/ACCESS DATA |
SBN Comet Website
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