| Emission nebula | |
|---|---|
| H II region | |
 Sh 2-31 (lower right) and Sh 2-32 (center) | |
| Observation data: J2000 epoch | |
| Right ascension | 18h 09m 42s |
| Declination | 23° 59′ 17″ |
| Distance | 4570 ly (1500 pc) |
| Apparent magnitude (V) | 10.96[1] |
| Apparent dimensions (V) | 1.63° x 1.12° [2] |
| Constellation | Sagittarius |
| Physical characteristics | |
| Radius | 11 ly |
| Designations | CED 154b, Gum 75, h 1996, IC 1274, LBN 33 |
Sh 2-31, also known by the designation IC 1274, is an emission nebula in the constellation Sagittarius. It is ionized by the stars HD 165921 and HD 166107.[3] Sh 2-31 is located very close to the Lagoon Nebula.[4]
Discovery
[edit]Sh 2-31 was discovered, along with nearby Sh 2-29, by John Herschel on 1st July 1826. He listed it as 'h 1996'. In 1833, he re-discovered it, this time labeling it as 'h 3733'. The distinction between the various nebulae of the region would not be established until 1892, when Edward Emerson Barnard photographed that region of the sky.
References
[edit]- ^ "Sharpless (Sh2) - Astrobasics". 13 September 2022.
- ^ "Ic 1274, Ic 1275".
- ^ "Sh 2-31".
- ^ "Gallery Johannes Schedler".
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