Data Set Information
|
DATA_SET_NAME |
ROSETTA-ORBITER 67P NAVCAM 2 ROSETTA EXTENSION 2 MTP028 V1.1
|
DATA_SET_ID |
RO-C-NAVCAM-2-EXT2-MTP028-V1.1
|
NSSDC_DATA_SET_ID |
|
DATA_SET_TERSE_DESCRIPTION |
This dataset contains ROSETTA NAVCAM RAW
DATA of the Escort Phase. Included are
EXT2-MTP028 data from 5 Apr 2016 to 3 May
2016.
|
DATA_SET_DESCRIPTION |
======================================================================
Data Set history:
======================================================================
This data set is version V1.1. The changes from the V1.0 are listed
below:
- Full size BROWSE images
- target names and types revised, mainly for 'CALIBRATION' of V1.0
- correction in min/max pixel value which affected some images
- updated EAICD version
======================================================================
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 5th Apr 2016 to 3rd
May 2016. The frequency of the navigation slots was of one 2x2 raster
every five hours, with interruption by manoeuvres. One raster with
four images was acquired with CAM2 in order to check its health
status. 528 navigation images were taken. In addition 280 context
images and 4 calibration ones were taken, which makes a total
of 813 images.
Three planned context images were not acquired due to ground station
issue.
There is one navigation image with lost rows due also to ground
station issue.
The orbiter was executing far fly-by arcs starting at 200km in the
terminator plane and descending to 80km at 80degrees phase angle.
Then, it executed a close fly-by through zero degree phase angle adn
at 30km minimum distance. The outbound trajectory arc was captured at
140km. The orbiter approached the comet at 70km at terminator plane.
The insertion into bound orbits was done by a night side arc with a
maximum phase angle of 120 degrees that reduced the distance to 19km.
The bound orbits at the end of MTP028 was at 19km distance.
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:
__.
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:
__.
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:
__F.
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).
======================================================================
|
DATA_SET_RELEASE_DATE |
2016-05-31T00:00:00.000Z
|
START_TIME |
2016-04-05T11:25:00.000Z
|
STOP_TIME |
2016-05-03T11:25:00.000Z
|
MISSION_NAME |
INTERNATIONAL ROSETTA MISSION
|
MISSION_START_DATE |
1995-03-01T12:00:00.000Z
|
MISSION_STOP_DATE |
N/A (ongoing)
|
TARGET_NAME |
67P/CHURYUMOV-GERASIMENKO 1 (1969 R1)
ALPHA LYR
ZETA CAS
|
TARGET_TYPE |
COMET
STAR
STAR
|
INSTRUMENT_HOST_ID |
RO
|
INSTRUMENT_NAME |
NAVIGATION CAMERA
|
INSTRUMENT_ID |
NAVCAM
|
INSTRUMENT_TYPE |
CCD CAMERA
|
NODE_NAME |
Small Bodies
|
ARCHIVE_STATUS |
LOCALLY ARCHIVED
|
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 EXT2-MTP028 V1.1,
RO-C-NAVCAM-2-EXT2-MTP028-V1.1,
ESA Planetary Science Archive and NASA Planetary Data System, 2017.
|
ABSTRACT_TEXT |
This dataset contains ROSETTA NAVCAM RAW
DATA of the Extension 2 Phase from
5th April 2016 to 3rd May 2016 when at
the vicinity of target 67P/CG.
This data set V1.1 supersedes the V1.0. It includes updates of the Browse
images, clarification of calibration target, document updates and resolve
other minor outstanding errata.
|
PRODUCER_FULL_NAME |
BERNHARD GEIGER
|
SEARCH/ACCESS DATA |
SBN Comet Website
|