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Extrait de NGC 2000.0 (Sky Publishing, ed. Sinnott 1988) Organisation du catalogue : Les nΘbuleuses sont rΘparties dans 50 zones de 30x30 degrΘs selon le mΩme principe que les grandes rΘgions du Guide Star Catalog . ( Voir Jenkner et al. The Astronomical Journal vol 99, num 6 June 1990 p.2087) dΘclinaison nombre numΘro de la du centre de zones premiΦre zone ------------- ------------ -------------- 15 12 1 45 9 13 75 4 22 -15 12 26 -45 9 38 -75 4 47 Chaque zone est matΘrialisΘe par un fichier . Description des enregistrements des fichiers : NGCrec = record ar,de :longint ; id : word; ic : char; typ : array [1..3] of char; l_dim : char; n_ma : char; ma,dim:smallint; cons : array [1..3] of char; desc : array[1..50] of char; end; - ar : ascention droite 2000 en degrΘs * 100'000 - de : declinaison 2000 * 100'000 - id : numΘro NGC ou IC - ic : I pour IC , blanc pour NGC - typ : type d'objet - l_dim : limite de la taille - n_mag : p si magnitude photographique - ma : magnitude * 100 - dim : plus grande dimension en minutes * 10 - cons : constelation - desc : description Type Intervalle Format ------------ -------------------------- ------------------- Shortint -128 .. 127 SignΘ, 8 bits SmallInt -32768 .. 32767 SignΘ, 16 bits Longint -2147483648 .. 2147483647 SignΘ, 32 bits Byte 0 .. 255 Non signΘ, 8 bits Word 0 .. 65535 Non signΘ, 16 bits Description originale du catalogue : VII/118 NGC 2000.0 (Sky Publishing, ed. Sinnott 1988) ================================================================================ Copyright Notice: This catalog is copyrighted by Sky Publishing Corporation, which has kindly deposited the machine version in the data centers for permanent archiving and dissemination to astronomers for scientific research purposes only. The data should not be used for commercial purposes without the explicit permission of Sky Publishing Corporation. ================================================================================ Description: NGC 2000.0 is a modern compilation of the New General Catalogue of Nebulae and Clusters of Stars (NGC), the Index Catalogue (IC), and the Second Index Catalogue compiled by J. L. E. Dreyer (1888, 1895, 1908). The new compilation of these classical catalogs is intended to meet the needs of present-day observers by reporting positions at equinox B2000.0 and by incorporating the corrections reported by Dreyer himself and by a host of other astronomers who have worked with the data and compiled lists of errata. The object types given are those known to modern astronomy. The catalog lists object ID, object type, positions in equinox B2000.0, source of modern data (see NGC 2000 paperback copy), constellation, object size, magnitude, and the description of the object as given by Dreyer. The order of the new catalog is strictly by right ascension, the NGC and IC objects being merged into one machine-readable file. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file ngc2000.dat 96 13226 The NGC 2000.0 Catalogue names.dat 70 227 Index of Messier and common names -------------------------------------------------------------------------------- Byte-per-byte Description of file: ngc2000.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- Name NGC or IC designation (preceded by I) 7- 9 A3 --- Type *Object classification 11- 12 I2 h RAh Right Ascension 2000 (hours) 14- 17 F4.1 min RAm Right Ascension 2000 (minutes) 20 A1 --- DE- Declination 2000 (sign) 21- 22 I2 deg DEd Declination 2000 (degrees) 24- 25 I2 arcmin DEm Declination 2000 (minutes) 27 A1 --- Source *Source of entry 30- 32 A3 --- Const Constellation 33 A1 --- l_size [<] Limit on Size 34- 38 F5.1 arcmin size ? Largest dimension 41- 44 F4.1 mag mag ? Integrated magnitude, visual or photographic (see n_mag) 45 A1 --- n_mag [p] 'p' if mag is photographic (blue) 47- 96 A50 --- Desc *Description of the object -------------------------------------------------------------------------------- Note on Type: the field is coded as follows: 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 *** Triple star D* Double star * Single star ? Uncertain type or may not exist blank Unidentified at the place given, or type unknown - Object called nonexistent in the RNGC (Sulentic and Tifft 1973) PD Photographic plate defect Note on Source: sources that have been used to correct or update modern data in NGC 2000.0 (type, positions, magnitude, and size). Uppercase letters denote special NGC and IC errata lists, which have usually been accorded more weight than the source catalogues themselves. In parentheses after each citation is the number of times it has been used to update NGC entries (first number) and those in the IC (second number). A 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) D Dreyer, J.L.E., ibid. Errata on pages 237, 281-283, and 366-378. (158,28) F 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>) Note on Desc: description of the object, as given by Dreyer or corrected by him, in a coded or abbreviated form. The abbreviations and their combination are fully described in the introduction to the published catalog. ab about alm almost am among annul annular or ring nebula att attached b brighter bet between biN binuclear bn brightest to n side bs brightest to s side bp brightest to p side bf brightest to f side B bright c considerably chev chevelure co coarse, coarsely com cometic (cometary form) comp companion conn connected cont in contact C compressed Cl cluster d diameter def defined dif diffused diffic difficult dist distance, or distant D double e extremely, excessively ee most extremely er easily resolvable exc excentric E extended f following (eastward) F faint g gradually glob. globular gr group i irregular iF irregular figure inv involved, involving l little (adv.); long (adj.) L large m much m magnitude M middle, or in the middle n north neb nebula nebs nebulous neby nebulosity nf north following np north preceding ns north-south nr near N nucleus, or to a nucleus p preceding (westward) pf preceding-following p pretty (adv., before F. B. L, S) pg pretty gradually pm pretty much ps pretty suddenly plan planetary nebula (same as PN) prob probably P poor (sparse) in stars PN planetary nebula r resolvable (mottled, not resolved) rr partially resolved, some stars seen rrr well resolved, clearly consisting of stars R round RR exactly round Ri rich in stars s suddenly (abruptly) s south sf south following sp south preceding sc scattered sev several st stars (pl.) st 9... stars of 9th magnitude and fainter st 9..13 stars of mag. 9 to 13 stell stellar, pointlike susp suspected S small in angular size S* small (faint) star trap trapezium triangle triangle, forms a triangle with triN trinuclear v very vv _very_ var variable * a single star *10 a star of 10th magnitude *7-8 star of mag. 7 or 8 ** double star (same as D*) *** triple star ! remarkable !! very much so !!! a magnificent or otherwise interesting object -------------------------------------------------------------------------------- Byte-by-byte Description of file: names.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 35 A35 --- Object Common name (including Messier numbers) 37- 41 A5 --- Name *NGC or IC name, as in ngc2000.dat 43- 70 A28 --- Comment Text of comment, if any -------------------------------------------------------------------------------- Note on Name: this field may be blank for Messier objects without NGC or IC counterparts. when one object corresponds to several entries in ngc2000, the Object is repeated (e.g. Copeland's Septet appears 7 times) -------------------------------------------------------------------------------- History by Wayne H. Warren Jr., December 1989: It is important, even for users of the machine-readable catalog and this documentation, to also have a copy of the published book. In addition to the tables and reference sources mentioned in this document, the book provides an introductory section with a brief history of the NGC and IC catalogs, a count of objects by constellation, information on Dreyer's descriptions, a table cross index of Messier and NGC/IC designations, and a table of common names for NGC objects. The book also contains a table of right ascensions for NGC and IC objects. A magnetic tape containing NGC 2000.0 was received from William E. Shawcross of Sky Publishing Corporation on August 14, 1989. According to Mr. Shawcross, the file supplied to the ADC was an unmodified version of the one used to produce the book, and it still contained the TEX commands employed to produce the special symbols present in the printed version. As received, the file also contained a single copyright text record at its beginning. The text record was removed to an added first file in the archived version and supplemented with a small amount of additional information. The TEX in the data file was replaced by standard characters to represent the information. Special symbols, such as "\Delta", "\bigcirc", etc., were changed to their spelled-out equivalents. The size field was modified to add decimal points to integer numbers and to align all values properly so that the field can be processed with a single format specification. The magnitude field was modified by moving the "p" code for photographic magnitude to its own byte in order to remove it from the numerical field. Decimal points were added to all integer numbers in this field also. The catalog data file was run through the ADC General Verification Program, which checks data ranges and for various other problems that can be detected in a systematic way. Further history: The standardised document was generated in April 1977 at CDS (James Marcout, Francois Ochsenbein). Acknowledgements: Appreciation is expressed to William E. Shawcross for responding to a request from the ADC to make NGC 2000.0 available to the scientific community in machine-readable form. Mr. Shawcross also arranged for a copy of the machine-readable TEX file to be created for deposit in the archives of the data centers. I am grateful to both Mr. Shawcross and to Roger W. Sinnott for reviewing a draft copy of this document and making comments. The comments resulted in the finding and elimination of a few TEX symbols that were missed during the initial work. The meticulous documentation initiated by Wayne H. Warren at ADC (December 1989) is the basis of the present document. References: Dreyer, J.L.E. 1888, "New General Catalogue of Nebulae and Clusters of Stars", MmRAS, 49, Part I (reprinted 1953, London: Royal Astronomical Society) Dreyer, J.L.E. 1895, "Index Catalogue of Nebulae Found in the Years 1888 to 1894 with Notes and Corrections to the New General Catalogue", MmRAS, 51, 185 (London: Royal Astronomical Society, reprinted 1953) Dreyer, J.L.E. 1908, "Second Index Catalogue of Nebulae Found in the Years 1895 to 1907; with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888 to 1894", MmRAS, 59, Part 2, 105 (London: Royal Astronomical Society, reprinted 1953) Sulentic, J. W. and Tifft, W. G. 1973, "The Revised New General Catalogue of Nonstellar Astronomical Objects" (Tucson: The University of Arizona Press; catalog <VII/1>). ================================================================================ (End) Francois Ochsenbein [CDS] 03-Apr-1997