Sh 2-58

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Sharpless 2-58
Nebula
Observation data: epoch
Right ascension 18h 31m 24.00s [1]
Declination −08° 28′ 0.0″ [1]
Distance8,060  ly    (2472  pc)
Constellation Scutum
DesignationsSh 2-58, LBN 79 [1]
See also: Lists of nebulae

Sh 2-58 (also known as LBN 79) is an emission nebula visible in the constellation of Scutum. [2] [3] [4]

Located in the western part of the constellation, about 1° SW of the star Alpha Scuti, it extends for 8 arc minutes in the direction of a region of the Milky Way heavily obscured by dense dust clouds. The best time to observe it in the evening sky is between June and November, being only 9° from the celestial equator, it can be seen from all populated regions of the Earth.

Characteristics

It is a remote H II region located on the inner edge of the Sagittarius Arm at a distance of about 8,060 light-years (2470 parsecs), about 300 parsecs from the Sagittarius OB4 association. This nebula would be associated with the molecular cloud SYCSW 317, identified through its emissions at the wavelength of CO, and the radio wave source [L89b] 23.115+0.556, coinciding with a compact H II region. Further evidence of active star formation comes from the presence of the infrared radiation source RAFGL 5246S. [5] [6] [7]

The area of sky in which Sh 2-58 is located includes the nearby cloud Sh 2-57, from which it is apparently separated by the dark nebula LDN 446, and the large superbubble known as the Scutum supershell, however, the distances of the individual objects are different from each other and therefore there would be no physical relationship between them: Sh 2-57 would in fact be located at 1500 parsecs from the solar system, therefore very much in the foreground, while the superbubble would be part of the Scutum-Crux Arm, being at a distance of about 3400 parsecs. Even more distant would be the supernova remnant W41. [8] [9]

References

  1. 1 2 3 "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2025-11-16.
  2. ↑ Paladini, R.; Burigana, C.; Davies, R. D.; Maino, D.; Bersanelli, M.; Cappellini, B.; Platania, P.; Smoot, G. (January 2003). "A radio catalog of Galactic HII regions for applications from decimeter to millimeter wavelengths". Astronomy & Astrophysics. 397 (1): 213–226. doi:10.1051/0004-6361:20021466. ISSN   0004-6361.
  3. ↑ Sharpless, Stewart (December 1959). "A Catalogue of H II Regions". The Astrophysical Journal Supplement Series. 4: 257. doi:10.1086/190049. ISSN   0067-0049.
  4. ↑ "Sh 2-58". galaxymap.org. Retrieved 2025-12-09.
  5. ↑ Scoville, N. Z.; Yun, Min Su; Sanders, D. B.; Clemens, D. P.; Waller, W. H. (April 1987). "Molecular clouds and cloud cores in the inner Galaxy". The Astrophysical Journal Supplement Series. 63: 821. doi:10.1086/191185. ISSN   0067-0049.
  6. ↑ Lockman, Felix J. (November 1989). "A survey of radio H II regions in the northern sky". The Astrophysical Journal Supplement Series. 71: 469. doi:10.1086/191383. ISSN   0067-0049.
  7. ↑ Avedisova, V. S. (March 2002). "A catalog of star-forming regions in the galaxy". Astronomy Reports. 46 (3): 193–205. doi:10.1134/1.1463097. ISSN   1063-7729.
  8. ↑ Blitz, L.; Fich, M.; Stark, A. A. (June 1982). "Catalog of CO radial velocities toward galactic H II regions". The Astrophysical Journal Supplement Series. 49: 183. doi:10.1086/190795. ISSN   0067-0049.
  9. ↑ Sterling, N. C.; Savage, B. D.; Richter, P.; Fabian, D.; Sembach, K. R. (March 2002). "Far Ultraviolet Spectroscopic Explorer Observations of O vi Overlying the Scutum Supershell". The Astrophysical Journal. 567 (1): 354–362. doi:10.1086/338421. ISSN   0004-637X.
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