I/97                Perth 75 Catalogue   (Nikoloff+ 1982)
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Beginning of ReadMe : I/97 Perth 75 Catalogue (Nikoloff+ 1982) ================================================================================ Perth 75: a catalogue of positions of 2589 FK4 and FK4S stars Nikoloff I., Hog E. <Bickley W. Australia, Perth Observatory (1982)> ================================================================================ ADC_Keywords: Positional data ; Proper motions ; Meridian observations ; Stars, fundamental Description: The catalog contains results of approximately 60000 photoelectric meridian circle observations made at the Perth Observatory for 1156 FK4 and 1433 FK4 Supplement stars south of declination +38 degrees. The catalog reports proper motions and positions at epoch and equinox B1950.0. The data used to derive the epoch 1950 positions are included in the catalog so that originally observed positions may be recomputed and used for geodetic purposes until the FK5 becomes available. The mean error of an individual position in this catalog is 0.07" in right ascension and 0.13" in declination at a zenith distance of 45 degrees, while the mean error of the PERTH 75 system is 0.05" in right ascension and 0.10" in declination. The positions do not contain the large systematic errors of the FK4 (Fricke and Kopff 1963), which can be, for example 0.3" in right ascension for declination < -75 degrees. Data in the catalog included FK4 (FK4S) number, observed visual magnitude, spectral type used for computing refraction, right ascension and declination (equinox and epoch B1950.0), annual proper motion, observed residuals, numbers of accepted observations, and code to indicate if parallax and/or radial velocity has been used in computing apparent positions.

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