VizieR Online Data Catalog: Saturnian satellites in the Gaia ref. frame (Khovritchev+, 2021)
Abstract
Photographic observations of the main Saturnian satellites were performed at Pulkovo Observatory with the 26-inch refractor (hereafter P26; D=0.65m, F=10.413m) and the normal astrograph (hereafter PNA; D=0.33m, F=3.463m). The effective field of view (FOV) is 30x30arcmins for the P26 and 2x2degrees for the PNA. The corresponding angular scales of the astronegatives are 19.8078arcsec/mm and 59.56arcsec/mm.
The results obtained with a small set of 14 of those plates are included in this paper. These plates were obtained with the Zeiss Double Astrograph (ZDA; D=0.4m, F=3.024m, FOV=3.5x4.5degrees, angular scale is 68arcsec/mm) of the Abastumani Astrophysical Observatory in Georgia 1984. The Pulkovo Mobile Digitizing Device (MDD) was used to scan 357 photographic plates. The field distortion pattern of the MDD lens was investigated by comparing scans of the same plate taken with the MDD and the New Astrometric Reduction of Old Observations digitizer located at the Paris Observatory (NAROO https://omekas.obspm.fr/s/naroo-project/page/home). Further astrometric calibration was performed with the linear model using the Gaia DR2 catalog as a reference. As a result, the described approach of digitization and calibration allows us to reach a 1mkm-1.5mkm accuracy level for the positional measurements of the satellite images on the photographic plates. In total, 6487 positions (equatorial coordinates) have been determined with an accuracy of 50mas. This is confirmed by a comparison of our data with modern ephemerides. The verification of the results was performed using data from past close approaches by Saturnian satellites to Gaia reference stars, showing the adequacy of the current residual analysis. The electronic tables that contain the equatorial coordinates of the main Saturnian satellites and the parameters of the close approaches of the satellites to the Gaia DR2 stars are available online. (2 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- November 2020
- DOI:
- 10.26093/cds/vizier.36450076
- Bibcode:
- 2020yCat..36450076K
- Keywords:
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- Solar system;
- Planets;
- Positional data;
- Plate data;
- Ephemerides