J/other/PSS/271.07240 Phoebe precise CCD positions using Gaia DR3 (Wang+, 2026)
The precise CCD positions of Phoebe using Gaia DR3 catalogue.
Wang N., Xue Z.Y., Zhang B.B., Peng Q.Y., Cheng X.M., Ye Y.M.
<Planetary and Space Science, 271, 107240 (2026)>
=2026P&SS..27107240W 2026P&SS..27107240W (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Planets ; Positional data
Keywords: techniques: image processing - astrometry -
planets and satellites: individual: Saturn
Abstract:
Phoebe was observed in 2023 and 2024 by Yunnan Observatory 1.0m
telescope. These observations, along with those obtained from
2011-2014 by Yunnan Observatory 2.4m telescope, were processed using
the Gaia DR3 star catalogue.
To improve positional measurements, the two-dimensional Gauss fit or
the effective point spread function was applied. During the reduction,
the geometric distortion of the calibration field was solved, the
precision premium was reduced, and the differential color refraction
was accounted for.
A total of 368 CCD observations were obtained. The theoretical
position of Phoebe was derived from IMCCE ephemeris ph12 and
Saturn's position from JPL ephemeris DE441. The results show that
the mean (O-C) is -0.002 and 0.016 arcsec in right ascension and in
declination, respectively. The dispersion of our observations is 0.028
and 0.028 arcsec in right ascension and in declination, respectively.
Description:
This table contains 368 positions of the Saturnian satellites Phoebe
from Yunnan Observatory 2.4m and 1.0m telescope that were taken in
2011-2014 and 2023-2024, respectively. The field of view for the 2.4m
telescope is ∼0.16°, and its approximate scale factor is
∼0.286arcsec/pixel, for the 1.0m telescope is ∼0.266° or
∼0.119°, and its approximate scale factor is ∼0.234 arcsec/pixel
or ∼0.209 arcsec/pixel. Positions of Phoebe are provided in right
ascension and declination. RA and DE are given in the observed
topocentric apparent positions without atmospheric refraction. JD is
the Julian Date (UTC).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 52 368 Positional measurement of Phoebe
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See also:
I/359 : Gaia DR3 Part 5: Solar System (Gaia Collaboration, 2022)
J/A+A/391/767 : CCD observations of Phoebe in 1998-1999 (Fienga+, 2002)
J/MNRAS/366/208 : Precise positions of Phoebe (Peng+, 2006)
J/A+A/454/379 : 2003-2004 Phoebe CCD astrometry (Qiao+, 2006)
J/MNRAS/413/1079 : 2005-2008 Phoebe CCD astrometry (Qiao+, 2011)
J/MNRAS/449/2638 : 2011-2014 Phoebe CCD astrometry (Peng+, 2015)
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Inst the IAU code for the telescope
7- 20 F14.6 d JD Julian Date of the observation
24- 25 I2 h RAh Phoebe's right ascension,
observed topocentric apparent position
27- 28 I2 min RAm Phoebe's right ascension,
observed topocentric apparent position
31- 37 F7.4 s RAs Phoebe's right ascension,
observed topocentric apparent position
39 A1 --- DE- Phoebe's declination sign,
observed topocentric apparent position
40- 41 I2 deg DEd Phoebe's declination,
observed topocentric apparent position
43- 44 I2 arcmin DEm Phoebe's declination,
observed topocentric apparent position
47- 52 F6.3 arcsec DEs Phoebe's declination,
observed topocentric apparent position
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Acknowledgements:
Na Wang, twangna(at)jnu.edu.cn
(End) Patricia Vannier [CDS] 04-Dec-2025