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The 312 items in Sharpless sometimes overlap with the 110 Messier objects (M), 7,840 objects in the New General Catalogue (NGC), the Caldwell catalogue (itself a "best of" from other catalogues, with 109 items), and the RCW catalog. Contemporary catalogs were Gum and RCW, but they mainly covered the southern hemisphere.
Sh 2-1, also known as Sharpless 1, is the combination of a diffuse HII emission nebula and reflection nebula in the constellation of Scorpius with Pi Scorpii at its center. It appears as a modest brightness making it one of the easier Sharpless catalog objects for amateur astronomers to view.
NGC 1624, also known as Sh2-212 [3] in the Sharpless catalog, is a very young open cluster in the constellation Perseus inside an emission nebula. It was discovered by German-British astronomer William Herschel in 1790. [4] NGC 1624 is about 20,000 ly (6,000 pc) from Earth, and latest estimates give it an age of less than 4 million years. [2]
Z — Fritz Zwicky, Catalogue of galaxies and of clusters of galaxies; ZC — Robertson's Zodiacal Catalogue (James Robertson's catalogue of 3539 zodiacal stars brighter than 9th magnitude) Zij — Islamic astronomical books that tabulates parameters used for astronomical calculations of the positions of the Sun, Moon, stars, and planets
Sh 2-155 [4] was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue, [5] being a part of the much larger Cep OB3 Association. [5] Although Sh 2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies ...
Sharpless catalog This page was last edited on 7 August 2012, at 00:47 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...
Sh 2-2, also known as Sharpless 2, is an emission nebula in the constellation of Scorpius. It appears as a mid-range brightness making it difficult to view. It is believed to currently host an X-ray binary star that originated and was ejected from the Scorpius OB1 association. Amateur astronomers can usually see it with a wide field telescope ...
Sharpless 101 (Sh 2-101) is a H II region [1] emission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae.