Sh 2-43

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Sharpless 2-43
Nebula
Observation data: epoch
Right ascension 18h 16m 24.00s
Declination −17° 30′ 60.0″ [1]
Distance5,200  ly    (1,600 [2]   pc)
Constellation Sagittarius
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

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

  1. 1 2 "Sh 2-43". simbad.cds.unistra.fr. Retrieved 2025-10-28.
  2. 1 2 3 4 "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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