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Sh 2-43

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Sharpless 2-43
Nebula
Observation data: epoch
Right ascension18h 16m 24.00s
Declination−17° 30′ 60.0″[1]
Distance5,200 ly   (1,600[2] pc)
ConstellationSagittarius
DesignationsSh 2-43, RCW 156[1]
See also: Lists of nebulae

Sh 2-43 also known as RCW 156, is an emission nebula located in the constellation of Sagittarius. It is a faint, diffuse region of ionized hydrogen gas, potentially representing a localized concentration within a broader area of interstellar emission. It lies in a relatively empty patch of sky, bordered by several OB associations including Sgr OB1, Sgr OB7, and Sct OB3.[3][2][4]

Charecterstics

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The nebula includes a slightly brighter core region designated as RCW 156a[5] and is associated with the star forming region SFR 13.62-0.76,[6][7] which encompasses infrared sources, molecular clouds, and the radio H II region [CH87] 013.839-0.763.[8] It is also spatially aligned with the suspected supernova remnant GAL 013.1-00.5.[9][2]

Nearby bright star HD 167720, a K2 III giant star is visible near the nebula, though it is not responsible for ionizing the nebula.[10][2][11]

References

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  1. ^ a b "Sh 2-43". simbad.cds.unistra.fr. Retrieved 2025-10-28.
  2. ^ a b c d "Sh 2-43". galaxymap.org. Retrieved 2025-10-28.
  3. ^ Astronomy, Go. "Sh2-43 | Nebula in Sagittarius | GO ASTRONOMY". Go-Astronomy.com. Retrieved 2025-10-28.
  4. ^ Russeil, D. (January 2003). "Star-forming complexes and the spiral structure of our Galaxy". Astronomy and Astrophysics. 397: 133–146. Bibcode:2003A&A...397..133R. doi:10.1051/0004-6361:20021504. ISSN 0004-6361.
  5. ^ "RCW 156a". galaxymap.org. Retrieved 2025-10-28.
  6. ^ "Star Formation Region Avedisova 196 | Galaxy Map". galaxymap.org. Retrieved 2025-10-28.
  7. ^ "VizieR". vizier.cfa.harvard.edu. Retrieved 2025-10-28.
  8. ^ "[CH87] 013.839-0.763". simbad.cds.unistra.fr. Retrieved 2025-10-28.
  9. ^ "GAL 013.1-00.5". simbad.harvard.edu. Retrieved 2025-10-28.
  10. ^ "HD 167720". simbad.cds.unistra.fr. Retrieved 2025-10-28.
  11. ^ Gorham, Peter W. (November 1990). "A Radio/Infrared/Optical Study of Candidate Supernova Remnants from the Clark Lake 30.9 MHz Galactic Plane Survey". The Astrophysical Journal. 364: 187. Bibcode:1990ApJ...364..187G. doi:10.1086/169401. ISSN 0004-637X.
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