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The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. [3] The total mass of the Omega Nebula is an estimated 800 solar masses. [4]
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae.
Approximately 17,000 Bok globules were discovered in the nebula nine years later as a part of the Palomar Sky Survey; studies later showed that Bok's hypothesis that the globules held protostars was correct. [16] The Omega Nebula is a fairly bright nebula, sometimes called the Horseshoe Nebula or Swan Nebula. It has an integrated magnitude of 6 ...
Caldwell advocates, however, see the catalogue as a useful list of some of the brightest and best known non-Messier deep-sky objects. Thus, advocates dismiss any "controversy" as being fabricated by older amateurs simply not able or willing to memorize the new designations despite every telescope database using the Caldwell IDs as the primary ...
It thus appears less impressive to people in the temperate northern hemisphere than counterparts fairly near in angle (best viewed in the Summer night sky) such as M13 and M5. M22 is one of only four globulars of our galaxy [ c ] known to contain a planetary nebula (an expanding, glowing gas swell from a massive star, often a red giant).
The Orion Nebula and cluster from the VLT Survey Telescope. [15] The data volume produced by OmegaCAM is large. About 30 terabytes of raw data will be produced per year and will flow back into data centres in Europe for processing. A novel and sophisticated software system has been developed at Groningen and Naples to handle the very large data ...
The location of the Small Sagittarius Star Cloud is near the Omega Nebula (also known as M17) and open cluster Messier 18, both north of M24. M24 is one of only three Messier objects that are not actual deep sky objects. [6] M24 fills a space of significant volume to a depth of 10,000 to 16,000 light-years.
It is also the brightest patch of nebulosity in the sky. [12] [13] [14] Small Magellanic Cloud (NGC 292) 2.7 200 kly (61 kpc) Tucana: Visible only from the southern hemisphere. [12] [15] Andromeda Galaxy (M31, NGC 224) 3.4 2.5 Mly (770 kpc) Andromeda: Once called the Great Andromeda Nebula, it is situated in the Andromeda constellation. [12] [16]