Data Set Information
|
DATA_SET_NAME |
GASKELL PHOEBE SHAPE MODEL V1.0
|
DATA_SET_ID |
CO-SA-ISSNA-5-PHOEBESHAPE-V1.0
|
NSSDC_DATA_SET_ID |
NULL
|
DATA_SET_TERSE_DESCRIPTION |
Phoebe shape model from Cassini ISSNA and ISSWA images, by R.
Gaskell, version of July 7, 2010.
|
DATA_SET_DESCRIPTION |
Data Set Overview
=================
This shape model of Phoebe is based on 208 Cassini Imaging Science
Subsystem narrow and wide angle camera (ISSNA and ISSWA) images. The shape
model was prepared by Robert Gaskell on July 7, 2010.
The geometrical coordinate system of this model is defined by the
planetary constants file cpck13Sep2010.tpc (available in PDS from the NAIF
node) with an updated pole from Thomas:
RA=356.90 DEC=77.88 PM=178.58 W=939.639 (deg/da).
To find the file in PDS, go to the NAIF SPICE archive at
http://naif.jpl.nasa.gov/naif/data_archived.html. In the table of data
links, select the volume FTP link for the Cassini Orbiter mission.
Within the volume, go to the data/pck directory, and download the desired
file (cpck13Sep2010.tpc).
The parameters of the model are as follows:
Number of landmarks: 522
Formal position uncertainty: 150 m/component
Number of images: 208
Pointing uncertainty: .032 mrad
S/C position uncertainty: N/A (tight a prioris)
Pointing residuals (relative to CK): 0.275 mrad
Range residuals: N/A
Number of measurement pairs 22555
Number of measurements per landmark: 131
RMS LMK location residual: 183 m/component
The models were originally prepared in the Implicitly Connected
Quadrilateral (ICQ) format. Vertex-facet format versions, derived from
the ICQ versions, are also provided. The filenames are
phoebe_quad512q.tab and phoebe_ver512q.tab, where 512 is the value
of Q (an indicator of the resolution). See below for the full
definition of Q and the ICQ format.
The file 'phoebeimagelist.tab' is a list of the Cassini ISSNA and ISSWA
images used to generate this model.
A text file, 'icqmodel.asc' is provided in the 'document' directory
which describes the ICQ format and the derivation of the
vertex-facet versions.
|
DATA_SET_RELEASE_DATE |
2011-05-31T00:00:00.000Z
|
START_TIME |
2004-06-11T12:00:00.000Z
|
STOP_TIME |
2004-06-12T12:00:00.000Z
|
MISSION_NAME |
CASSINI-HUYGENS
|
MISSION_START_DATE |
1997-10-15T12:00:00.000Z
|
MISSION_STOP_DATE |
N/A (ongoing)
|
TARGET_NAME |
PHOEBE
|
TARGET_TYPE |
SATELLITE
|
INSTRUMENT_HOST_ID |
CO
|
INSTRUMENT_NAME |
IMAGING SCIENCE SUBSYSTEM - NARROW ANGLE
IMAGING SCIENCE SUBSYSTEM - WIDE ANGLE
|
INSTRUMENT_ID |
ISSNA
ISSWA
|
INSTRUMENT_TYPE |
CAMERA
IMAGING SCIENCE SUBSYSTEM
|
NODE_NAME |
Small Bodies
|
ARCHIVE_STATUS |
LOCALLY_ARCHIVED
|
CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview
=========================
Note that the vertex-facet versions of the model have some duplicate
vertices on the edges and corners of the cube. The duplicate vertices are
not used in the facet table, resulting in the presence of some vertices in
the vertex table which do not appear in the facet table. This does not
affect the correctness of the vertex-facet version.
|
CITATION_DESCRIPTION |
Gaskell, R.W., Gaskell Phoebe Shape Model V1.0.
CO-SA-ISSNA-5-PHOEBESHAPE-V1.0. NASA Planetary Data System, 2011.
|
ABSTRACT_TEXT |
The shape model of Phoebe derived by Robert Gaskell from Cassini
images. The model is provided in the implicitly connected
quadrilateral (ICQ) format. This version of the model was
prepared on July 7, 2010. Vertex-facet versions of the models are
also provided.
|
PRODUCER_FULL_NAME |
CAROL NEESE
|
SEARCH/ACCESS DATA |
SBN PSI WEBSITE
|