VII/295 USNO Galilean observations (Robert+, 2024)
NAROO program: Analysis of USNO Galilean observations 1967-1998.
Robert V., Pascu D., Lainey V., Arlot J.-E.
<Icarus, 426, 116344 (2025)>
=2025Icar..42516344R 2025Icar..42516344R
=2024yCat.7295....0R 2024yCat.7295....0R
ADC_Keywords: Solar system ; Planets ; Plate data ; Positional data ; Optical
Keywords: astrometry - Io - Europa - Ganymede - Callisto - Jupiter
Abstract:
The New Astrometric Reduction of Old Observations (NAROO) program is
dedicated to the measurement of astrophotographic plates and the
analysis of old observations for scientific purposes. One of the main
objectives of the NAROO program is to provide accurate positional
measurements of planets and satellites to improve our knowledge of
their orbits and dynamics, and to infer the accuracy of the planet and
satellite ephemerides.
We digitized 553 astronegatives of the Galilean satellites taken with
the McCormick 26-inch refractor in 1967/68 and the U. S. Naval
Observatory 26-inch refractor from 1973 to 1998, resulting in 2650
individual observations. We measured and reduced these observations
through an optimal process that includes image, instrumental, and
spherical corrections using Gaia-DR3 catalog to provide the most
accurate equatorial (RA, Dec) ICRS (Gaia-CRF3) positions. 4819
positions of the Galilean satellites have been determined with an
accuracy of 55 mas (160km at Jupiter), near the limit of the
photographic technique for such work.
These data can help to improve the equatorial positions of Jupiter.
They also can be used in the context of quantifying tidal effects and
will still be useful when Europa Clipper and Juice data will become
available.
Description:
Astrometric and measured data of Jupiter, Io, Europa, Ganymede and
Callisto taken with the McCormick 26-inch refractor in 1967/68 and the
U. S. Naval Observatory 26-inch refractor from 1973 to 1998.
Astrometric (RA,DEC) positions are topocentric observed positions
reduced from Gaia-DR3 stars and refer to the Gaia-CRF3. They were
corrected for all instrumental and spherical effects, including
corrections for the phase effect and the total chromatic atmospheric
refraction.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table500.dat 45 1355 Astrometric data of Jupiter (1967-1998)
table501.dat 45 1145 Astrometric data of Io (1967-1998)
table502.dat 45 1178 Astrometric data of Europa (1967-1998)
table503.dat 45 1274 Astrometric data of Ganymede (1967-1998)
table504.dat 45 1222 Astrometric data of Callisto (1967-1998)
--------------------------------------------------------------------------------
See also:
J/A+A/572/A104 : Astrometric obs. of Phobos and Deimos 1971 (Robert+, 2014)
J/A+A/582/A36 : USNO Martian observations (Robert+, 2015)
J/A+A/596/A37 : USNO Saturnian observations 1974-1998 (Robert+, 2016)
J/A+A/645/A76 : Saturnian sat. in the Gaia ref. frame (Khovritchev+, 2021)
Byte-by-byte Description of file: table*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 F16.8 d JD Julian Day of observation (TDB)
20- 31 F12.8 deg RAdeg Right Ascension (Gaia-CRF3)
34- 45 F12.8 deg DEdeg Declination (Gaia-CRF3)
--------------------------------------------------------------------------------
Acknowledgements:
Vincent Robert, vincent.robert(at)obspm.fr
The NAROO program was supported by the DIM-ACAV of Ile-de-France
region, PSL Research University, the Programme National GRAM (PNGRAM),
the Programme National de Planetologie (PNP) and the Programme
National Soleil-Terre (PNST) of CNRS/INSU with INP and IN2P3,
co-funded by CNES, and the Gaia Specific Action (AF Gaia) of Paris
Observatory. This work has made use of data from the European Space
Agency (ESA) mission Gaia, processed by the Gaia Data Processing and
Analysis Consortium (DPAC). Funding for the DPAC has been provided by
national institutions, in particular the institutions participating in
the Gaia Multilateral Agreement.
(End) V. Robert [Obs. Paris - IMCCE, IPSA], P. Vannier [CDS] 12-Oct-2024