J/A+A/454/379 2003-2004 Phoebe CCD astrometry (Qiao+, 2006)
CCD astrometric observations of Phoebe in 2003-2004.
Qiao R.C., Tang Z.H., Shen K.X., Dourneau G., Yan Y.R., Yu Y., Wang S.H.,
Liu J.R.
<Astron. Astrophys. 454, 379 (2006)>
=2006A&A...454..379Q 2006A&A...454..379Q
ADC_Keywords: Planets - Positional data
Keywords: planets and satellite: general - astrometry
Abstract:
In 2003-2004, we obtained 115 new observations of Phoebe, the 9th
Saturnian faint satellite (visual magnitude of about 16.5). We used a
large CCD detector (2048 x2048 pixels) mounted on the 1.56m
astrometric reflector at the Sheshan Station, near Shanghai. In our
reduction, an up-to-date catalogue of stars, UCAC2 (Zacharias et al.,
2004, Cat. I/289), was chosen to ensure a proper astrometric
calibration. A comparison of our observations to three recently
available, high quality ephemerides, including the JPL SAT185 by
Jacobson (SAT185, JPL satellite ephemeris), has shown that most of our
observed positions of Phoebe present an accuracy of some tens of mas,
which appears to be a very high level for such a faint satellite.
Description:
The positions of Phoebe are topocentric and given in the ICRF J2000
system.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
phoebe.dat 44 115 CCD astrometric observations in 2003-2004
--------------------------------------------------------------------------------
See also:
J/A+A/391/767 : CCD observations of Phoebe in 1998-1999 (Fienga+, 2002)
J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)
J/A+AS/121/65 : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)
J/A+AS/136/257 : Saturn's satellites in 1995/97 (Harper+ 1999)
J/A+A/422/377 : 1997-2000 Saturn's satellites astrometry (Qiao+, 2004)
Byte-by-byte Description of file: phoebe.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Obs.Date Observation date (YYYY/MM/DD.ddddd)
18- 19 I2 h RAh Right ascension (Topocentric, ICRF J2000)
21- 22 I2 min RAm Right ascension (Topocentric, ICRF J2000)
24- 30 F7.4 s RAs Right ascension (Topocentric, ICRF J2000)
32 A1 --- DE- Declination sign (Topocentric, ICRF J2000)
33- 34 I2 deg DEd Declination (Topocentric, ICRF J2000)
36- 37 I2 arcmin DEm Declination (Topocentric, ICRF J2000)
39- 44 F6.3 arcsec DEs Declination (Topocentric, ICRF J2000)
--------------------------------------------------------------------------------
Acknowledgements: R.C. Qiao, rcqiao(at)ntsc.ac.cn
(End) Patricia Vannier [CDS] 18-Apr-2006