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J/A+A/391/767    CCD observations of Phoebe in 1998-1999        (Fienga+, 2002)

CCD observations of Phoebe, 9th satellite of Saturn, made in 1998 and 1999 at Observatoire de Haute Provence. Fienga A., Arlot J.-E., Baron N., Bec-Borsenberger A., Crochot A., Emelyanov N., Thuillot W. <Astron. Astrophys. 391, 767 (2002)> =2002A&A...391..767F
ADC_Keywords: Solar system ; Planets ; Positional data Keywords: planets and satellites: general - astrometry Abstract: In 1998 and 1999, we started observations of the 9th satellite of Saturn. We made 163 observations using the 120cm-telescope of Observatoire de Haute-Provence, France. We used the USNO A2 catalogue (Cat. I/252) of stars for the astrometric reduction. With the help of observations of optical counterparts of ICRF sources, a zonal correction to the USNO A2.0 catalogue was computed and applied to the Phoebe positions. A comparison to the most recent theories was made. Description: Topocentric ICRF J2000 Phoebe positions reduced from CCD observations realised with the 1.2m of the OHP Observatory. The positions proposed in the following table is corrected from a systematic effect introduced by the USNO A2.0 reference stars. This correction was estimated after ICRF optical counterparts observations (Fienga and Andrei, 2002, A&A, submitted) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file phoebe.dat 46 163 Observed positions of Phoebe.
See also: I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) J/A+A/383/1054 : Astrometry of Pluto and Saturn in 1995-2001 (Rapaport+, 2002) 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+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999) J/other/KFNT/15.483 : Positions of Thebe and Amalthea (Ledovskaya+ 1999) Byte-by-byte Description of file: phoebe.dat
Bytes Format Units Label Explanations
1- 4 I4 yr Obs.Y Year of observation 6- 7 I2 "month" Obs.M Month of observation 9- 19 F11.8 d Obs.D UTC day of observation 21- 22 I2 h RAh Right ascension (Topocentric, ICRF J2000) (1) 24- 25 I2 min RAm Right ascension (Topocentric, ICRF J2000) (1) 27- 32 F6.3 s RAs Right ascension (Topocentric, ICRF J2000) (1) 34 A1 --- DE- Declination sign (Topocentric, ICRF J2000) (1) 35- 36 I2 deg DEd Declination (Topocentric, ICRF J2000) (1) 38- 39 I2 arcmin DEm Declination (Topocentric, ICRF J2000) (1) 41- 45 F5.2 arcsec DEs Declination (Topocentric, ICRF J2000) (1)
Note (1): These positions are topocentric, ICRF J2000 and corrected from the USNO A2.0 (Cat. I/252) zonal error
Acknowledgements: These observations have been made possible thanks to the CNRS (Centre National de la Recherche Scientifique), the Institut des sciences de l'Univers/CNES through the Programme National de Planetologie and the Institut de mecanique celeste/Bureau des Longitudes. We also wish to thank the staff of the Observatoire de Haute-Provence (OHP) for their efforts and their help during the campaign. The Guide Star Catalogue-II is a joint project of the Space Telescope Science Institute and the Osservatorio Astronomico di Torino. Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, for the National Aeronautics and Space Administration under contract NASA5-26555. The participation of the Osservatorio Astronomico di Torino is supported by the Italian Council for Research in Astronomy. Additional support is provided by European Southern Observatory, Space Telescope European Coordinating Facility, the International GEMINI project and the European Space Agency Astrophysics Division. Acknowledgements: Agnes Fienga
(End) Patricia Bauer [CDS] 30-May-2002
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