NGC


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NGC

Short for New General Catalogue of Nebulae and Clusters of Stars, prepared by the Danish astronomer J.L.E. Dreyer at Armagh Observatory, Ireland, and published in 1888. It was based on an earlier General Catalogue of Nebulae and Clusters of Stars (GC),compiled in 1864 by Sir John Herschel from his own observations and previous catalogs by his father and aunt, Sir William and Caroline Herschel. Dreyer's work listed 7840 currently known nonstellar objects – nebulae, clusters, and galaxies (although the galaxies were not yet identified as such). Each object is numbered by right ascension and its position and description given. The number is preceded by the letters NGC; this is the object's NGC number, an example being NGC 1976: the Orion nebula. Some of the brightest NGC objects also appear in the Messier Catalog.

Dreyer listed 5386 further discoveries in two supplements to the original NGC. These were the first and second Index Catalogs (IC), published in 1895 and 1908. The three catalogs, now published as one volume, cover the whole sky.

The NGC underwent several revisions during its first hundred years. In 1988, on the centenary of Dreyer's original publication, Roger Sinnott published NGC 2000.0, a version of the NGC and IC containing the positions of 13 226 objects for the epoch 2000.0. In 2001 Wolfgang Steinicke produced a more thorough revision, adding a further 767 objects. The NGC/IC Project, accessible over the World Wide Web, seeks to eliminate observing errors and misidentifications inherent in Dreyer's original work to arrive at a clean version of the NGC and IC, with each object unambiguously numbered and identified and correctly attributed to its discoverer.

References in periodicals archive ?
According to the ESA, NGC 2985 sits within the Great Bear or the Ursa Major constellation, which is visible from the northern hemisphere throughout the year.
ASSA Top-100 Deep-Sky Objects n Object 1 NGC 55 2 NGC 104, 47 Tuc 3 NGC 247 4 NGC 246 5 NGC 253, Silver Coin 6 NGC 288 7 SMC 8 NGC 362 9 M77, NGC 1068 10 NGC 1261 11 NGC 1291 12 NGC 1316 13 NGC 1365 14 NGC 1535 15 NGC 1851 16 LMC 17 M79, NGC 1904 18 M42, Orion Nebula 19 NGC 1977 20 NGC 2070, Tarantula 21 M41, NGC 2287 22 NGC 2362, tau CMa 23 M47, NGC 2422 24 M46, NGC 2437 25 NGC 2451 26 M93, NGC 2447 27 NGC 2477 28 NGC 2516 29 NGC 2547 30 M48, NGC 2548 31 lC 2391 32 NGC 2808 33 NGC 2818 34 IC 2488 35 NGC 3114 36 NGC 3115, Spindle 37 NGC 3132, Eight-Burst 38 NGC 3201 39 NGC 3242 40 IC 2581 41 NGC 3293 42 NGC 3324 43 IC 2602, South.
One of the brightest galaxies in Pegasus, NGC 7177 resides 2.5[degrees] east and 27' north of 13 Pegasi.
LaSalle announced that there are no planned changes with NGC's core leadership team, or the core offering of services and products it currently provides to its clients and retail partners.
For the initial batch of the NGC coins, Guinigundo said 139.57 million coin denominations would be released.
The galaxy IC 5160 is only 6' north of the lovely open cluster NGC 7193.
Vald'or selected NGC's software to replace its outdated legacy solutions and support the company's rapid growth.
With each collision, gas and dust feed a supermassive black hole in the core of NGC 1316 that weighs about as much as 150 million suns.
"NGC 6334 is forming stars at a more rapid pace than Orion-so rapidly that it appears to be undergoing what might be called a burst of star formation," said lead author Sarah Willis of the Harvard-Smithsonian Center for Astrophysics (CfA) and Iowa State University.
* When is an NGC most likely to be vulnerable to takeover by a non-cooperative firm?
NextHop's NGC 2.2 routing software also provides multiple new enhancements to meet the challenging needs of network equipment manufacturers building for either the service provider or enterprise market.