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VII/1B Revised New General Catalogue (Sulentic+, 1973)
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Revised New General Catalogue of Nonstellar Astronomical Objects
Sulentic J.W., Tifft W.G.
<Univ. of Arizona Press (1973)>
=1973rncn.book.....S
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ADC_Keywords: Nonstellar objects ; Galaxy catalogs
Description:
The catalog is a modern, revised, and expanded version of the original
NGC (Dreyer 1888). In addition to incorporating the many corrections
to the NGC found over the years, each object was verified on Palomar
Observatory Sky Survey (POSS) prints and on plates for southern
objects specifically taken for the purpose (although about 90 southern
objects could not be verified).
Please refer to the documentation by Wayne H. Warren Jr. in
file "adc.doc".
References:
Dreyer, J.L.E. 1888,"New General Catalogue of Nebulae and Clusters of
Stars", MmRAS, 49, Part I (reprinted 1962, London: Royal Astronomical
Society) (1888MmRAS..49....1D)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
adc.doc 79 1187 Documentation by Wayne H. Warren Jr. (1982)
catalog.dat 192 8163 The Revised NGC Catalog
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See also:
VII/13 : Arp's globular cluster catalog
VII/49 : Zwicky's Catalogue of Galaxies and Clusters of Galaxies (CGCG)
VII/62 : Vorontsov-Velyaminov's Morphological Catalog of Galaxies (MCG)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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2- 5 I4 --- NGC [1/7840]+= The original NGC number
6 A1 --- m_NGC Component of NGC (6)
8- 9 I2 --- Type Type of object (1)
11- 12 I2 h RAh Right Ascension (1975)
14- 17 F4.1 min RAm Right Ascension (1975)
19 A1 --- DE- Declination (1975) sign
20- 21 I2 deg DEd Declination (1975)
23- 24 I2 arcmin DEm Declination (1975)
26- 31 F6.2 deg GLON ? Galactic longitude
33- 38 F6.2 deg GLAT ? Galactic latitude
40- 42 I3 mm Xpos ? Position eastwards on POSS blue print
44- 46 I3 mm Ypos ? Position northwards on POSS blue print
48- 51 F4.1 mag Mag ? Magnitude rounded to the nearest
half magnitude
53 I1 --- r_Mag ? Source of Magnitude (2)
55- 94 A40 --- OldDesc Visual appearance of object transcribed from
Dreyer J.L.E. (1888) (3)
96-151 A56 --- NewDesc Palomar Sky Survey Description of each
object (4)
153-192 A40 --- Notes Cross References for RNGC objects (5)
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Note (1): the object type is coded as follows :
1 Open Cluster 6 Cluster associated with nebulosity
2 Globular Cluster 7 Non existent
3 Diffuse Nebula 8 Object in Large Magellanic Cloud
4 Planetary Nebula 9 Object in Small Magellanic Cloud
5 Galaxy 0 Unverified southern object
Combination of two type numbers may appear for an object
(such as 28 for a Globular cluster in LMC, etc)
Note (2): The magnitude sources are coded as follows:
1 de Vaucouleurs (RC1, 1964) 5 Collinder (1931)
2 Zwicky (1961-1968) <VII/49> 6 Arp (1965) <VII/13>
3 Vorontsov-Velyaminov <VII/62> 7 Vorontsov-Velyaminov (1931)
4 Lindsay =1958MNRAS.118..172L 8 Bok (1962), Van den Bergh (1968)
The complete references are given in the file "adc.doc".
Note (3): data blocks, separated by commas, each describing an aspect
of the visual appearance of the object from Dreyer's (1888) catalogue.
The appearance aspects are written in the following order:
(a) For nebulae the sequence of blocks is:
brightness, size, shape, radial brightness variation,
comments referring to the field.
(b) For clusters the sequence is:
identification (cluster), size, richness, compression,
brightness of the stars therein.
The various codes and abbreviations are detailed in Table 5 of
the file "adc.doc".
Note (4): The data blocks in the new description do not follow the
regular sequence used in the old description.
The description are decoded by taking each individual block of
comma-separated data and finding the largest combination of
letters present in the RNGC code table (Table 6 in file "adc.doc").
Note (5): See Table 7 in file "adc.doc" for acronyms used in
cross-references.
Note (6): Some anonymous objects near NGC objects or components
in multiple systems are assigned the same NGC number followed
by a letter in alphabetic sequence
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Historical Notes:
* See Section 4 in file "adc.doc"
* The catalogue was distributed on the "Selected Astronomical Catalogs"
Vol. 1 CD-ROM (1991), directory /nonstell/galaxies/rngc,
as five files: the description (the present "adc.doc" file),
the data file, old (Dreyer's) description supplement,
new description supplement, and cross-reference supplements.
* 15-Mar-1993: the four data files were merged into a single
"catalog" file at CDS (Francois Ochsenbein).
* 04-Nov-1995: this ReadMe file revisited at CDS.
* 07-Apr-1999: catalog.dat corrected at CDS (bad Messier numbers)
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(End) [CDS] 07-Apr-1999