VII/26D     Uppsala General Catalogue of Galaxies (UGC)     (Nilson 1973)

Uppsala General Catalogue of Galaxies (UGC) Nilson P. <Uppsala Astron. Obs. Ann. 6 (1973)> =1973UGC...C......0N (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs Description: The Uppsala General Catalogue of Galaxies (UGC) is an essentially complete catalogue of galaxies to a limiting diameter of 1.0' and/or to a limiting apparent magnitude of 14.5 on the blue prints of the Palomar Observatory Sky Survey (POSS). Coverage is limited to the sky north of declination -02.5degrees. Galaxies smaller than 1.0' in diameter but brighter than 14.5 mag may be included from the Catalogue of Galaxies and of Clusters of Galaxies (CGCG, Zwicky et al. 1961-1968); all such galaxies in the CGCG are included in the UGC. The galaxies are ordered by 1950 right ascension. The catalogue contains descriptions of the galaxies and their surrounding areas, plus conventional system classifications and position angles for flattened galaxies. Galaxy diameters on both the blue and red POSS prints are included and the classifications and descriptions are given in such a way as to provide as accurate an account as possible of the appearance of the galaxies on the prints. Only the data portion of the published UGC is included in the machine-readable version. The order of the records is strictly by UGC number; i.e., the Addenda records follow their main catalogue counterparts in the file. The colons (indicating uncertainty) and various other codes (parentheses, brackets) are not included in the machine-readable version of the catalogue. Several possible improvements to the catalogue might consist of adding codes corresponding to the published version, a second file containing abbreviations and terminology and a third file with the extensive notes. It would also be important to add an asterisk or some other code to data records having a note in the proposed third file. This document describes the machine-readable version of the UGC as distributed by the Astronomical Data Centers. It is intended to enable users to read and process the data without problems or guesswork. For additional details regarding the classifications, measurement of apparent magnitudes, and data content, the source reference should be consulted. A copy of this document should accompany any machine-readable copy of the catalogue. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 81 12939 UGC catalogue errors.dat 49 133 The changes made by the ADC in 1995
See also: J/ApJS/125/409 : Arcsecond positions of UGC galaxies (Cotton+ 1999) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [UGC] 5- 9 I5 --- UGC [1/12921]+= UGC number 10 A1 --- A [A] "A" if the galaxy is from the Addenda list of the published catalogue; otherwise blank. 11- 12 I2 h RAh Right Ascension 1950 (hours) 13- 16 F4.1 min RAm Right Ascension 1950 (minutes) 17 A1 --- DE- Declination 1950 (sign) 18- 19 I2 deg DEd Declination 1950 (degrees) 20- 21 I2 arcmin DEm Declination 1950 (minutes) 22- 34 A13 --- MCG MCG designation (1) 35- 38 I4 --- POSS Number of the POSS field in which the galaxy is best visible. 39- 44 F6.2 arcmin MajAxis ? Major axis of the galaxy as measured on the POSS blue print. (2) 45- 49 F5.2 arcmin MinAxis ? Minor axis of the galaxy as measured on the POSS blue print. (2) 50- 52 I3 deg PA [0/180[? Position angle measured in the conventional manner from North through East. (3) 53- 59 A7 --- Hubble Classification in the Hubble system or remarks, in a free field format, including lower case designations. 61- 64 F4.1 mag Pmag ? Photographic magnitude mpg , recorded to precision given in published catalogue; i.e., if tenths not reported, byte 64 is blank. 65- 69 I5 km/s RadVel ? Radial velocity corrected for Solar motion (4) 70- 75 F6.2 arcmin aR ? Major axis of the galaxy as measured on the POSS red print. (2) 76- 80 F5.2 arcmin bR ? Minor axis of the galaxy as measured on the POSS red print. (2) 81 I1 --- i [0/7]? Inclination to the line of sight for spirals (5)
Note (1): The Morphological Catalogue of Galaxies (MCG) (Vorontsov-Velyaminov et al. 1962, 1963, 1964, 1968). The first number of the designation is the Palomar Observatory Sky Survey (POSS) 6deg zone, from the equator +00 to the north celestial pole +15; the second number is the POSS field along the zone, while the third number is the galaxy in this field in the MCG. Non-MCG galaxies are assigned the number 000 in the third position, but the first and second values are given correctly. Note (2): The precision to which diameters are recorded matches the published catalogue; additional decimal places are blank, but colons, brackets and parentheses are not included in the computerized catalogue. Note (3): Colons, parentheses and brackets in the published catalogue are not included here. Blank if data not present. Note (4): Radial Velocity is relative to the Local Group according to V0 = 300 cos A, where A is the distance to the conventional Solar apex at lI=55deg, bI=0deg or lII = 87deg bII = +1deg. If the uncertainties in the measurements were considered too large to make corrections meaningful, usually only the uncorrected value is given. See also other values in VII/36 Note (5): Inclination measured on a scale from 1 (face-on) to 7 (edge-on). For galaxies of high inclination, a value is calculated from the Hubble formula n - 10(a-b)/a [a - major axis, b - minor axis]. The value 7 denotes objects inclined not more than a few degrees to the line of sight.
Byte-by-byte Description of file: errors.dat
Bytes Format Units Label Explanations
1- 5 I5 --- UGC Number of entry 6 A1 --- A [A] Suffix for entry number 7- 9 A3 --- field Field in error 11- 20 A10 --- old Old entry 22- 42 A21 --- new New entry and comments
Historical Notes: The magnetic tape version of the Uppsala General Catalogue of Galaxies was received from Dr. Robert S. Dixon of the Ohio State University Radio Observatory on 7 December 1981. As received, the catalogue consisted of 12,942 logical records of length 90 bytes. Each logical record contained a sequential counter on bytes 85-90, while bytes 81-84 and single columns throughout the records were not used. There was also only a five-byte allowance for the major axis of the galaxy as measured on the red POSS print, a field too small to accommodate U00454 (M31), which has a major axis of 200:' (in order to fit the 200' value, the radial velocity had been moved left one byte, thus making it read -2990 km/sec instead of the correct value of -299 km/sec). The following modifications were made to the catalogue to fix the above items, correct several errors, and to maximize storage efficiency. Except for item 10, these modifications were made by Francois Ochsenbein at the CDS. 1.The published edition contains 12,921 objects in the main catalogue and 19 addenda; hence, with 12,942 records on the tape there were obviously a few duplicates. The records for UGC 3944 and UGC 6063A were found to be repeated and the duplicates were deleted. 2.A check for the addenda objects resulted in the discovery of a missing A for UGC 7399A--this was added. 3.Upon examination of the original file version of the catalogue supplied to him, Mr. Marion Schmitz discovered the misnumbering of UGC 12417 and UGC 12418 as UGC 12447 and UGC 12448--these errors were corrected. 4.The data record for UGC 253 was found to have a hexadecimal code "AA" character (equivalent to a down-arrow in the classification field (bytes 46-52) in place of a lower case "b" (Sb/SB(down-arrow) instead of Sb/SBb)--this was corrected. 5.The data field for the major axis as measured on the red POSS print was expanded to six bytes and the record for UGC 454 (discussed above) corrected. 6.All superfluous blanks were removed to decrease the logical record length from 90 bytes to 74 bytes (counting also the removal of the sequential numbers originally in bytes 85-90). 7.UGC and MCG catalog designations were altered to their present format, extending the record length to 81 bytes. 8.(Version C, made at CDS, August 1993) a. The error reported by Carlo Giovanardi in "ADC Newsletter" 2.2 (April 1993) was corrected (RAh column) b. The position of the minor axis blue in UGC 326 which was shifted has been fixed. c. All records with radial velocities larger than 10000 km/s expanded over the red major axis column; the + sign in column 65 was therefore removed for the following galaxies: UGC 262 UGC 545 UGC 1095 UGC 4093 UGC 5408 UGC 6514 UGC 8058 UGC 8327 UGC 8696 UGC 8811 UGC 8825 UGC 9509 UGC 10099 UGC 10170 UGC 10180 UGC 10188 UGC 10189 UGC 10191 UGC 10192 UGC 10199 UGC 10635 UGC 11130 UGC 11763 UGC 12397 d. UGC Number 20016 should be read 12016 Position angles for UGC 153, 341 and 388 were corrected (S. Nishimura, on 30-Aug-1993) 9.(Version D, made at CDS September 1995, following comments by Ralph Pass ), typo errors in UGC numbers: 4500 5228 5258 7307 10374 10377 10848 11718 11748 12342 12392 12847 12848 12817 12818 12843 12873 10.At least one error may have been corrected inappropriately. UGC5206 and 5854A are both given as MGC+02-28-002 but UGC 5206 is at RA=0941.7 while the MGC galaxy is at RA=1041.7. 5854A is at that location. It was assumed that these referred to the same galaxy. Hence UGC5854A was deleted and the RA changed for UGC5206 by the undersigned. She also moved two records which were out of order to the proper position. Acknowledgments: The present version includes a few corrections inserted by CDS (see Remarks, Modifications, points 8 and 9) compared to the CD-ROM "Selected Astronomical Catalogs Volume 1" edited by the Astronomical Data Center, NASA, 1992. It also contains a number of corrections inserted by the undersigned. The latter are listed in errors.dat. Points 8 and 9, the "File Summary" and the "Byte-per-byte Description" were prepared by Francois Ochsenbein of the CDS. The file errors.dat and minor modifications to this acknowledgement were prepared by the undersigned. Otherwise, the documentation herein is from Wayne H. Warren Jr. (1982). The latter expressed appreciation to Dr. R. S. Dixon for supplying the original tape version of the UGC, and to Mr. M. Schmitz for pointing out the errors that he discovered in the UGC numbers (point 3 above). Nancy G. Roman expresses appreciation particularly to Mark Anderson who did an extensive analysis of the catalog. Others errors were reported by Ralph Pass, Carlo Giovanardi, and James Himer. All have been checked and most reported errors were correct as reported. References: Nilson, P. 1973, Uppsala General Catalogue of Galaxies, Uppsala Astron. Obs. Ann. 6. Vorontsov-Velyaminov, B. A., Krasnogorskaya, A. and Arhipova, V. P. 1962-1968, Morphological Catalogue of Galaxies, 4 Volumes (Moscow: Sternberg Institute 32, 33, 34, 38). (Catalogue VII/62) Warren, W.H. Jr 1982, "Documentation for the Machine-Readable Version of the Uppsala General Catalogue of Galaxies", NSSDC/WDC-A-R&S 82-30, National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, Maryland 20771 Zwicky, F. et al. 1961-1968, Catalogue of Galaxies and of Clusters of Galaxies, I-VI (Pasadena: California Institute of Technology). (Catalogue VII/49)
(End) Nancy Grace Roman [ADC/SSDOO] 20-Oct-1995
The document above follows the rules of the Standard Description for Astronomical Catalogues; from this documentation it is possible to generate f77 program to load files into arrays or line by line

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