Overview

This second volume of RC3 includes data for galaxies between Oh and 12h. For convenience, we repeat the explanation of the catalogue entries below. Details of the reduction procedures, and Notes, References, and Appendices are in Volume 1. 2. The Catalogue The data for each galaxy are found on four successive lines on a single page. The entries are as follows: Column 1: Positions Line 1: RA and DEC = right ascension and declination for the equinox 2000.0, precessed from the 1950.0 position in Column 1, Line 4, given to 0.1 second of time and 1 aresec when available, and to 0.1 minute of time and 1 arcmin otherwise (Section 3.l.a). Line 2: I and b = galactic longitude and latitude in the lAU 1958 system (Blaauw et al. 1960); both to 0?01. Line 3: SGL and SGB = supergaladie longitude and latitude in the RC2 system (Section 3.l.b), both to 0?01. Line 4: RA and DEC = right ascension and declination for the equinox 1950.0 (Sec- tion 3.l.a). Column 2: Names = commonly used designations for the galaxies (Section 3.2). Line 1: Names ( e.g., LMC, SMC) or NGC and IC designations. Line 2: UGC (Nilson 1973), ESO (Lauberts 1982), MCG (Vorontsov-Velyaminov et al. 1962-1974), UGCA (Nilson 1974), and CGCG (Zwicky et al. 1961-1968) des- ignations, given in that order of preference. MCG designations not listed here are given in UGC and ESO.

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