Image Credit: Derek Rowley
Simeis 147 is a very large supernova remnant (about 3 degrees across in apparent diameter) about 6 full moons across the sky.
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The Sharpless catalog is a list of 313 H II 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 (Sh2).
The catalog prefix is Sh2 because this list of 313 objects is his second catalog version – Sharpless also includes some planetary nebulae and supernova remnants, in addition to H II regions.
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| Sharpless by HII Regions (clouds of ionized hydrogen) (313 objects) |
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Other Deep Sky Objects
| Abell – Abell Catalog | |
| ARP – Arp’s Catalog | |
| B – Barnard | |
| C – Caldwell | |
| Cr – Collinder | |
| IC – Index Catalogue | |
| M – Messier | |
| Mel – Melotte | |
| NGC – New General Catalogue | |
| SH2 – Sharpless | |
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