Sh 2-228
H II region in the constellation Auriga
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Sh 2-228 (also known as LBN 784) is an emission nebula and H II region located in the constellation of Auriga.[3] It is part of the Sharpless catalog of 313 H II regions compiled by American astronomer Stewart Sharpless.[4]
| Nebula | |
|---|---|
| H II region | |
| |
| Observation data: J2000 epoch | |
| Right ascension | 05h 13m 25.50s[1] |
| Declination | +37° 27′ 1.0″[1] |
| Distance | 11,000[2] ly |
| Apparent dimensions (V) | 8′ × 8′ |
| Constellation | Auriga |
| Designations | Sh 2-228, LBN 784, Min 2-58, RAFGL 5137, IRAS 05100+3723, GAL 169.19-00.90[1] |
Sh 2-228 has an asymmetrical shape and is located near the large Auriga OB1 association. It is a region of star formation. Sh 2-228 contains or is associated with the infrared star cluster [IBP2002] CC 01[5] (also known as CC 01), a young open cluster with an estimated mass of about 1800 M☉.[2] The cluster consists of several bright blue stars and a population of fainter stars, with an age of approximately 1–2 million years. Surrounding field stars in the region are older, estimated at 5–6 million years.[2] In the Avedisova Catalogue, the nebula is also associated with some radio wave sources.[6]
Studies based on radio wave emissions have provided for Sh 2-228 a significantly greater distance, around 7,900 parsecs (over 25,000 light-years).[7]