J/A+A/610/A2 Saturnian satellites Cassini ISS astrometry (Cooper+, 2018)
The Caviar software package for the astrometric reduction of Cassini ISS images:
description and examples.
Cooper N.J., Lainey, V., Meunier, L-E., Murray C.D., Zhang, Q-F,
Baillie, K., Evans M.W., Thuillot, W., Vienne, A.
<Astron. Astrophys. 610, A2 (2018)>
=2018A&A...610A...2C 2018A&A...610A...2C (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Planets ; Positional data
Keywords: astrometry - methods: data analysis - techniques: image processing -
planets and satellites: general
Abstract:
Caviar is a software package designed for the astrometric measurement
of natural satellite positions in images taken using the Imaging
Science Subsystem (ISS) of the Cassini spacecraft. We provide new
astrometric positions for selected major satellites of Saturn,
2013-2016.
Description:
Table1.dat contains astrometric observations of the Saturnian
satellites Mimas, Enceladus, Tethys, Dione, Rhea, Iapetus, Hyperion,
Pandora, Janus and Helene,from Cassini ISS NAC images. The camera's
field of view is ∼0.35-degree with a resolution of
∼1.2354-arcsec/pixel. Image size is 1024x1024 pixel. Positions are
provided in both right ascension and declination, and as image pixel
locations. The orientation of the camera's pointing vector is also
provided. Positions are given in the International Celestial Reference
Frame (ICRF), centered on the Cassini spacecraft.
Measured reference star positions used to estimate the camera pointing
correction are provided separately in table5.dat. The origin of the
line, sample coordinate system is at the top left of the image with
line, y, increasing downward and sample, x, to the right.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 131 287 Astrometric observations of Saturnian satellites
Mimas, Enceladus, Tethys, Dione and Rhea from
Cassini ISS NAC images
table5.dat 140 1485 Observed reference star positions from
Cassini ISS NAC images
--------------------------------------------------------------------------------
See also:
J/A+AS/139/47 : 1995 Saturnian satellites mutual events (Emelianov+, 1999)
J/A+A/380/727 : 1995 Saturnian satellite observations (Vienne+, 2001)
J/A+A/383/296 : Saturnian Satellites positions (1996-2000) (Peng+, 2002)
J/A+A/400/1095 : 1995-99 CCD observation of Saturnian satellite (Veiga+, 2003)
J/other/SoSyR/45.523 : Saturnian satellites CCD observations (Grosheva+, 2011)
J/A+A/544/A29 : 2009 Saturnian satellites mutual events (Arlot+, 2012)
J/A+A/551/A129 : Mimas and Enceladus Cassini ISS astrometry (Tajeddine+ 2013)
J/A+A/572/A43 : Saturnian satellites Cassini ISS astrometry (Cooper+, 2014)
J/A+A/575/A73 : Astrometry of Saturnian satellites 2004-12 (Tajeddine+, 2015)
J/A+A/596/A37 : USNO Saturnian observations 1974-1998 (Robert+, 2016)
J/AJ/149/27 : Cassini ISS astrometry of Saturnian satellites (Cooper+, 2015)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Image Image identification number
14- 24 A11 "YYYY/MMM/DD" Obs.date Date of the observation
26- 37 A12 "h:m:s" Obs.time Observation time (image mid-time)
40- 49 F10.6 deg RAcdeg Camera's right ascension
52- 61 F10.6 deg DEcdeg Camera's declination
64- 73 F10.6 deg Twist Camera's Twist angle
76- 83 F8.2 pix Line Body's line position
86- 93 F8.2 pix Sample Body's sample position
96-105 F10.6 deg RAdeg Body's right ascension (ICRF)
108-117 F10.6 deg DEdeg Body's declination (ICRF)
120-131 A12 --- Body Name of the observed body
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Image Image identification number
13- 38 A26 --- Star Catalogue name of star (UCAC5)
39- 55 F17.12 deg RAdeg Star's right ascension (ICRF)
56- 72 F17.12 deg DEdeg Star's declination (ICRF)
73- 82 F10.4 pix Oline Star's observed line coordinate
83- 92 F10.4 pix Osamp Star's observed sample coordinate
93-102 F10.4 pix Pline Star's predicted line coordinate
103-112 F10.4 pix Psamp Star's predicted sample coordinate
113-122 F10.4 pix resline O-C line residual
123-132 F10.4 pix ressamp O-C sample residual
133-140 F8.3 --- mag Catalogue magnitude (UCAC5)
--------------------------------------------------------------------------------
Acknowledgements:
Nicholas Cooper, n.cooper(at)qmul.ac.uk
(End) Nicholas Cooper [QMUL], Patricia Vannier [CDS] 06-Nov-2017