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Overview
NGC 2000.0 is a modern compilation of the New General Catalogue of Nebulaeand Clusters of Stars (NGC), the Index Catalogue (IC), and the Second IndexCatalogue compiled by J. L. E. Dreyer (1888, 1895, 1908). The new compilationof these classical catalogs is intended to meet the needs of present-dayobservers by reporting positions at equinox 2000.0 and by incorporating thecorrections reported by Dreyer himself and by a host of other astronomers whohave worked with the data and compiled lists of errata. The object typesgiven are those known to modern astronomy.
This catalog is copyrighted by Sky Publishing Corporation, which has kindlydeposited the machine-readble version in the data centers for permanentarchiving and dissemination to astronomers for scientific research purposesonly. The data should not be used for commercial purposes without theexplicit permission of Sky Publishing Corporation. Information on how tocontact Sky Publishing is available at http://www.shopatsky.com/contacts.
Catalog Bibcode
References
Dreyer, J. L. E. 1888, New General Catalogue of Nebulae and Clusters of Stars,Mem. Roy. Astron. Soc. 49, Part I (reprinted 1953, London: Royal AstronomicalSociety).Dreyer, J. L. E. 1895, Index Catalogue of Nebulae Found in the Years 1888 to1894, with Notes and Corrections to the New General Catalogue, Mem. Roy.Astron. Soc. 51, 185 (reprinted 1953, London: Royal Astronomical Society).Dreyer, J. L. E. 1908, Second Index Catalogue of Nebulae Found in the Years1895 to 1907; with Notes and Corrections to the New General Catalogue and tothe Index Catalogue for 1888 to 1894, Mem. Roy. Astron. Soc. 59, Part 2, 105(reprinted 1953, London: Royal Astronomical Society).Sulentic, J. W. and Tifft, W. G. 1973, The Revised New General Catalogue ofNonstellar Astronomical Objects (Tucson: The University of Arizona Press).Documentation Reference: Warren Jr., W. H. 1989, NSSDC/WDC-A-R&S 89-29Source Catalog Reference: NGC 2000.0, The Complete New General Catalogue andIndex Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer, ed. R. W.Sinnott 1988 (Sky Publishing Corporation and Cambridge University Press).
Provenance
This HEASARC table was last updated in September 2022, based on theCDS catalog VII/118 file ngc2000.dat, in order to correct some truncateddescription fields. The previous update was in June 2005.
Parameters
Name
The name of the source in standard nomenclature. This parameter contains the object name in the form "NGC nnnn" for NGC objects and "IC nnnn" for IC objects, where "nnnn" indicates the sequence number of the object within the particular catalog.
Source_Type
This parameter contains the source type, or object classification, according to modern astronomy. This field is coded using the following abbreviations:
Code Meaning Gx Galaxy OC Open star cluster Gb Globular star cluster, usually in the Milky Way Galaxy Nb Bright emission or reflection nebula Pl Planetary nebula C+N Cluster associated with nebulosity Ast Asterism or group of a few stars Kt Knot or nebulous region in an external galaxy TS Triple star (was *** in the CDS table version) DS Double star (was ** in the CDS version) SS Single star (was * in the CDS version) ? Uncertain type or may not exist U Unidentified at the place given, or type unknown (was blank in CDS v.) - Object called nonexistent in the RNGC (Sulentic and Tifft 1973) PD Photographic plate defect
RA
The Right Ascension of the NGC/IC object in the selected equinox. This was given in B2000 coordinates to a precision of 0.1 minutes of time in the original table. The HEASARC has transformed these B2000 coordinates to J2000 for consistency with all the other catalogs in the HEASARC database; however, the positional difference as a result of this is on the order of a hundred times smaller than the precision with which the coordinates are given, so this transformation is not really noticeable in practice.
Dec
The Declination of the NGC/IC object in the selected equinox. This was given in B2000 coordinates to a precision of 1 arcminute in the original table. The HEASARC has transformed these B2000 coordinates to J2000 for consistency with all the other catalogs in the HEASARC database; however, the positional difference as a result of this is on the order of a hundred times smaller than the precision with which the coordinates are given, so this transformation is not really noticeable in practice.
LII
The Galactic Longitude of the NGC/IC object.
BII
The Galactic Latitude of the NGC/IC object.
Ref_Revision
This column contains a reference code that indicates the source of the modern data about the object that were used in NGC 2000.0. "Modern" data may include types, positions, sizes, and magnitudes, but not the descriptions, which are always those of Dreyer. Doubled letters such as 'AA' denote special NGC and IC errata lists, which have usually been accorded more weight than the source catalogs themselves. In parentheses after each citation in the list is the number of times that it has been used to update NGC entries (first number) and those in the IC (second number). The meaning of the reference codes is as follows:
Code Reference AA Archinal, Brent A. Version 4.0 of an unpublished list of errata to the RNGC, dated March 19, 1987. (110,0) A Arp, H., "Atlas of Peculiar Galaxies", 1966ApJS...14....1A (1,2) (Catalog <VII/74>) C Corwin, Harold G., Jr., A. de Vaucouleurs, and G. de Vaucouleurs, "Southern Galaxy Catalogue", Austin, Texas: University of Texas Monographs in Astronomy No. 4, 1985. (152,564) (Catalog <VII/116>) D Dreyer, J.L.E., New General Catalogue of Nebulae and Clusters of Stars (1888), Index Catalogue (1895), Second Index Catalogue (1908). London: Royal Astronomical Society, 1953. (28,2157) DD Dreyer, J.L.E., ibid. Errata on pages 237, 281-283, and 366-378. (158,28) FF Skiff, Brian, private communication of February 27, 1988. (93,36) H Holmberg, E., "A Study of Double and Multiple Galaxies", Lund Annals, 6, 1937. (13,2) K Karachentsev, I.D., "A Catalogue of Isolated Pairs of Galaxies in the Northern Hemisphere"; also, Karachentseva, V.E., "A Catalog of Isolated Galaxies." Astrofiz. Issled. Izv. Spetz. Astrofiz., 7, 3, 1972, and 8, 3, 1973. (0,4) (Catalogs <VII/77>, <VII/82>, <VII/83>) M Vorontsov-Velyaminov, B.A., and V.P. Arhipova, "Morphological Catalog of Galaxies", Parts I-V. Moscow: Moscow State University, 1962-74. (9,679) (Catalogs <VII/62> and <VII/100>) N Reinmuth, K., "Photographische Positionsbestimmung von NebelRecken" Veroff der Sternwarte zu Heidelberg, several papers, 1916-40. (0,4) O Alter, G., B. Balazs, and J. Ruprecht, Catalogue of Star Clusters and Associations, 2nd edition. Budapest: Akademiai Kiado, 1970. (5,0) (Catalogs <VII/5>, <VII/44> and <VII/101>) R Sulentic, Jack W., and William G. Tifft, "The Revised New General Catalogue of Nonstellar Astronomical Objects (RNGC)". Tucson, Arizona:University of Arizona Press, 1973. (4016,0) (Catalog <VII/1>) S Hirshfeld, Alan, and Roger W. Sinnott, eds., Sky Catalogue 2000.0, Vol.2, Cambridge, Massachusetts: Sky Publishing Corp. and Cambridge University Press, 1985. (3098,238) T Tully, R.B., "Nearby Galaxies Catalog". New York: Cambridge University Press, 1988. A preliminary version on magnetic tape (1981) was used here. (23,17) (Catalog <VII/145>) U Nilson P.N., Uppsala Ceneral Catalogue of Galaxies. Uppsala: Uppsala Astronomical Observatory, 1973. (15,543) (Catalog <VII/26>) V de Vaucouleurs, G., A. de Vaucouleurs, and H.C. Corvin, Jr., Second Reference Catalogue of Bright Galaxies. Austin, Texas, University of Texas Press, 1976.(118,206) (Catalog <VII/112>) X Dixon, R.S., and George Sonneborn, "A Master List of Nonstellar Optical Astronomical Objects (MOL)". Columbus, Ohio, Ohio State University Press, 1980. It should be noted that most of the information for codes a,h,k,m,n,o,u and z was extracted from the magnetic-tape version of this catalogue. The x code refers to IC objects identified in a literature search by these authors. (0,526) Z Zwicky, F., E. Herzog, and P. Wild, "Catalogue of Galaxies and Clusters of Galaxies", Vol.I. Pasadena, Calif., California Institute of Technology, 1961. Also, successive volumes through 1968. (1,380) (Catalog <VII/49>)
Constellation
The three-letter abbreviated name of the constellation in which the object is located.
Limit_Ang_Diameter
This field contains the character "<" if the object size is an upper limit, otherwise, this field is blank.
Ang_Diameter
This field contains the object size, in arc minutes. This is an angular size, as measured along the greatest dimension.
App_Mag
This field contains the integrated (total) magnitude of the type indicated by the app_mag_flag field. The precision varies.
App_Mag_Flag
This field contains a flag which indicates the type of magnitude. It contains a blank if the integrated magnitude is visual, "p" if it is a photographic (blue) magnitude.
Description
This field contains a description of the object, as given by Dreyer or corrected by him, in a coded or abbreviated form. For an NGC object, the description is always a visual impression, while the IC descriptions are often based on photographic appearance. A full list of the abbreviations can be found in Table II of the introduction to the published catalog (see References) or in the CDS ReadMe file for the originating table (http://cdsarc.u-strasbg.fr/ftp/cats/VII/118/ReadMe).
Class
The HEASARC Browse object classification of the NGC/IC object, based on the source_type parameter value.
Contact Person
Questions regarding the NGC2000 database table can be addressed to theHEASARC Help Desk.
Page Author: Browse Software Development Team
Last Modified: Wednesday, 23-Nov-2022 19:35:56 EST
