J/A+A/572/A43 Saturnian satellites Cassini ISS astrometry (Cooper+, 2014)
Cassini ISS mutual event astrometry of the mid-sized Saturnian satellites
2005-2012.
Cooper N.J., Murray C.D., Lainey V., Tajeddine R., Evans M.W., Williams G.A.
<Astron. Astrophys. 572, A43 (2014)>
=2014A&A...572A..43C 2014A&A...572A..43C
ADC_Keywords: Solar system ; Minor planets ; Positional data
Keywords: astrometry - occultations - planets and satellites: general -
methods: observational
Abstract:
We provide astrometric observations of the Saturnian satellites Mimas,
Enceladus, Tethys, Dione and Rhea from Cassini Imaging Science
Subsystem (ISS) narrow-angle camera (NAC) images. Image sequences were
designed to observe mutual occultations between these satellites.
Description:
Table2.dat contains astrometric observations of the Saturnian
satellites Mimas, Enceladus, Tethys, Dione and Rhea, from Cassini ISS
NAC images. The camera's field of view is ∼0.35° with a
resolution of ∼1.2354-arcsec/pixel. Image size is 1024x1024-pixel.
Although image sequences were designed to observe mutual occultations
between the satellites, we provide their individual absolute positions
(not inter-satellite separations). 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 131 2303 Astrometric observations of Saturnian satellites
Mimas, Enceladus, Tethys, Dione and Rhea from
Cassini ISS NAC images
table5.dat 129 9550 Observed reference star positions from Cassini
ISS NAC images
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See also:
I/289 : UCAC2 Catalogue (Zacharias+ 2004)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
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)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Image Image identification number
14- 24 A11 "YYYY/MMM/DD" Obs.date Observation time (image mid-time, UTC)
26- 37 A12 "h:m:s" Obs.time Observation time (image mid-time, UTC)
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 [-5/270] Camera's Twist angle
(known to an accuracy of 60urad≃0.003deg)
76- 83 F8.2 pix Ypos [-27/1020] Body's line position (G1)
86- 93 F8.2 pix Xpos [-39/1020] Body's sample position (G1)
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 (MIMAS, DIONE,
ENCELADUS, RHEA, or TETHYS)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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2- 12 A11 --- Image Image identification number
14- 27 A14 --- Star Catalogue name of star (mainly UCAC2)
29- 44 F16.12 deg RAdeg Star's right ascension (J2000)
46- 61 F16.12 deg DEdeg Star's declination (J2000)
63- 71 F9.4 pix Ypos.o [0/1024] Star's observed line coordinate (G1)
73- 81 F9.4 pix Xpos.o [0/1024] Star's observed sample coordinate (G1)
83- 91 F9.4 pix Ypos.p [0/1024] Star's predicted line coordinate (G1)
93-101 F9.4 pix Xpos.p [0/1024] Star's predicted sample coordinate (G1)
103-111 F9.4 pix dY [-2/21] O-C line residual (G1)
113-121 F9.4 pix dX [-15/12] O-C sample residual (G1)
123-129 F7.3 --- UCmag [5/15] Catalogue magnitude (UCAC2)
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Global Notes:
Note (G1): se use the Cassini ISS convention of referring to the image pixel
coordinate along the X-axis as "sample" and the Y-axis as "line".
Acknowledgements:
Nicholas Cooper, n.cooper(at)qmul.ac.uk
(End) Nicholas Cooper [QMUL], Patricia Vannier [CDS] 04-Sep-2014