Sh 2-31

Last updated
Sharpless 2-31
Emission nebula
H II region
Ic1274s.jpg
Sh 2-31 (lower right) and Sh 2-32 (center)
Observation data: J2000 epoch
Right ascension 18h 09m 42s
Declination 23° 59′ 17″
Distance4570  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
DesignationsCED 154b, Gum 75, h 1996, IC 1274, LBN 33
See also: Lists of nebulae

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

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

  1. ↑ "Sharpless (Sh2) - Astrobasics". 13 September 2022.
  2. ↑ "Ic 1274, Ic 1275".
  3. ↑ "Sh 2-31".
  4. ↑ "Gallery Johannes Schedler".
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