VII/118 NGC 2000.0 (Sky Publishing, ed. Sinnott 1988)
NGC 2000.0, The Complete New General Catalogue and Index Catalogue
of Nebulae and Star Clusters by J.L.E. Dreyer
Sinnott, R.W. (edited by)
<Sky Publishing Corporation and Cambridge University Press (1988)>
=1997yCat.7118....0S 1997yCat.7118....0S
=1988cngc.book.....S 1988cngc.book.....S
=1895MmRAS..51..185D 1895MmRAS..51..185D
+1989Sci...246.1066D 1989Sci...246.1066D
ADC_Keywords: Galaxy catalogs ; Nonstellar objects
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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ngc2000.dat 99 13226 The NGC 2000.0 Catalogue
names.dat 70 227 Index of Messier and common names
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Byte-per-byte Description of file: ngc2000.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name NGC or IC designation (preceded by I)
7- 9 A3 --- Type Object classification (1)
11- 12 I2 h RAh Right Ascension B2000 (hours)
14- 17 F4.1 min RAm Right Ascension B2000 (minutes)
20 A1 --- DE- Declination B2000 (sign)
21- 22 I2 deg DEd Declination B2000 (degrees)
24- 25 I2 arcmin DEm Declination B2000 (minutes)
27 A1 --- Source Source of entry (2)
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- 99 A53 --- Desc Description of the object (3)
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Note (1): 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 (2): 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 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 (3): 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
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Byte-by-byte Description of file: names.dat
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Bytes Format Units Label Explanations
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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
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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)
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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 "Δ", "\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).
History:
12-Feb-1994: on-line version
19-Aug-2022: originally Desc column truncated completed
(End) Francois Ochsenbein [CDS] 03-Apr-1997