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Sharpless catalog
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The Sharpless catalog is a list of 313 HII regions (emission nebulae), intended to be comprehensive north of declination −27°. (It does include some nebulae south of that declination as well.) The first edition was published in 1953 with 142 objects (Sh1), and the second and final version was published by US astronomer Stewart Sharpless in 1959 with 312 objects. Sharpless also includes some planetary nebulae and supernova remnants, in addition to HII regions.In 1953 Stewart Sharpless joined the staff of the United States Naval Observatory Flagstaff Station, where he surveyed and cataloged H II regions of the Milky Way using the images from the Palomar Sky Survey. From this work Sharpless published his catalog of H II regions in two editions, the first in 1953 with 142 nebula.Stewart Sharpless, A Catalogue of Emission Nebulae Near the Galactic Plane, Astrophysical Journal, vol. 118, p.362, 1953 The second and final edition was published in 1959 with 312 nebulae.BOOK, Steven, Dick, Sky and Ocean Joined: The United States Naval Observatory, U.S. Naval Observatory, 1830–2000, 2002, Cambridge University Press, 978-0-521-81599-4, Stewart Sharpless, A Catalogue of H II Regions, Astrophysical Journal Supplement, vol. 4, p.257, 1959Sharpless coordinates are based on the star catalogs Bonner Durchmusterung (BD) and Cordoba Durchmusterung (CD), but the second release was adjusted to the 1900 epoch.In the second release, some coordinates for southern hemisphere regions have an uncertainty over 1 minute of arc.Galaxy Map – The Gum, RCW, Sharpless and BFS catalogs This can make them difficult to find, so a revised catalog called BFS (Blitz, Fich and Stark) was released. BFS has 65 new regions and about 20 removals. Most of the removed items were taken out because they were the aforementioned nebula or remnants.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 (that itself is 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.

Examples

Examples of second Sharpless (1958 version) catalog; click on image for image credit, most of which are either various amateur astronomers, the ESO, ESA, or NASA{| class="wikitable sortable" style="font-size:94%;"! Sh 2- # || A common name || Images || Names and designations
NGC 6302 >99px) Sh2-6, NGC 6302, Bug Nebula,PK 349+01 1, Butterfly Nebula, RCW 124, Gum 60, Caldwell 69
NGC 6334 >99px) ESO 392-EN 009, Sharpless 8, RCW 127, Gum 64, NGC 6334
NGC 6357 >99px) Sh2-11, NGC 6357, RCW 131, Gum 66, War and Peace Nebula
Lagoon Nebula >99px) Sh2 25, RCW 146, Gum 72, Messier 8
99px) Sh2 29
Trifid Nebula>99px) Sh2 30, M20, NGC 6514, RCW 147, Gum 76
Omega Nebula >99px) Omega Nebula, M17, NGC 6618, Swan Nebula, Sharpless 45, RCW 160, Gum 81
Eagle Nebula >99px) Sh2 49, Messier 16, NGC 6611, RCW 165, Gum 83
Westerhout 40>W 40 (File:W40_star-forming_region_(no_arrow).jpg| Sh2 64, RCW 174
Tulip Nebula >| Sharpless 101
Crescent Nebula >99px) Sh2 105, NGC 6888, Sharpless 105, Caldwell 27
Celestial Snow Angel>Sh2-106 (File:Sharpless 2-106.jpg| Sh2-106, Celestial Snow Angel
North America Nebula >99px) NGC 7000, Caldwell 20
IC 5146>Cocoon Nebula (File:CocoonHunterWilson.jpg| IC 5146, Caldwell 19
99px) Image:Sh2-140.jpg>| Sh2-140
Cave Nebula >99px) Sh2-155, Caldwell 9
NGC 7635 >99px) Sh2-162, NGC 7635, Bubble nebula
NGC 281 >99px) NGC 281, IC 11
Maffei 1 >99px) Sh2-191, Maffei 1, PGC 9892
Maffei 2 >99px) Sh2-197, Maffei 2, UGCA 39,WEB
, NASA/IPAC Extragalactic Database
, Results for Maffei 2
,weblink
, 2006-11-25, PGC 10217,
Soul Nebula >99px) Sh2-199, LBN 667, Soul Nebula, IC 1848 (cluster only)
California Nebula >99px) NGC 1499, Sharpless 220
IC 405 >99px) Flaming Star Nebula, Caldwell 31, IC 405, Sh2-229
NGC 1931 >99px) Sharpless 237
NGC 1555 >99px) NGC 1555, Hind's Nebula, Sharpless 238
Crab Nebula >99px) Messier 1, NGC 1952,
IC 443 >99px) IC 443, Sh2-248, Jellyfish Nebula
Rosette Nebula >99px) Sh2-275, CTB 21
Sh2-279 >99px)
Barnard's Loop >99px) Sh2-276, Barnard's Loop
Flame Nebula >99px) Sh2-271, NGC 2024
Orion Nebula >99px) M42, NGC 1976, LBN 974
Sh2-297 >99px) Ced 90, LBN 1039
NGC 2359 >99px) Thor's Helmet, Gum 4, Sharpless 298, NGC 2359
{{Expand section|date=August 2009}}

See also

References

{{Reflist}}

External links

{{Sh2 objects}}

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