1097 I/97 Perth 75 Catalogue I Nikoloff E Hog Bickley W. Australia, Perth Observatory ??? ??? 1982 1981QB881.N55...... I/62 : The Perth 70 Catalogue of Positions of 24900 Stars (Hog+ 1976) I/143 : FK4 Catalogue (Fricke & Kopff, 1963) I/149 : FK5 Catalogue, part I : Basic Fundamental Stars (Fricke et al. 1988) I/175 : FK5 Catalogue, part II: Extension) (Fricke et al. 1991) Fricke, W., and Kopff, A. 1963, Veroeff. Astron. Rechen-Inst. Heidelb., Nos. 10, 11 (CDS Catalogues <I/143>) Positional data Proper motions Meridian observations Stars, fundamental 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.

FK4 Star number in FK4 (< 2000) or FK4S (> 2000). --- Vmag Observed or FK4 visual magnitude (see n_Vmag) mag n_Vmag An "s" (lower case) if Vmag has been taken from the FK4. --- Sp The HD spectral type --- RAh Right Ascension B1950 (hours) right ascension and declinations at Epoch=B1950.0, referred to equator and Equinox=B1950.0. The determination of the equator and zero point in R.A. was made from observations of approximately 40 FK4 stars per night. h RAm Right Ascension B1950 (minutes) min RAs Right Ascension B1950 (seconds) s DE- Declination B1950 (sign) --- DEd Declination B1950 (degrees) deg DEm Declination B1950 (minutes) arcmin DEs Declination B1950 (seconds) arcsec pmRA Annual proper motion in R.A. s/yr pmDE Annual proper motion in Dec. arcsec/yr O-C(RA) Observed residual in apparent RA cos(Dec), in the sense Observed minus FK4 or FK4S. 10mas O-C(DE) Observed residual in apparent in Dec., in the sense Observed minus FK4 or FK4S. 10mas o_RAs Number of accepted observations in R.A. --- o_DEs Number of accepted observations in Dec. --- EpRA-1900 Epoch - 1900 for the observation in R.A. yr pFlag A letter "p" (lower case) if parallax and/or radial velocity used in computing apparent positions. --- F. Ochsenbein CDS 1996Nov28This document is just an adaptation of the "Documentation for the machine-readable version of the Perth 75 catalogue" written by Wayne H. Warren Jr. in February 1984. I_97.xml