| Nebula | |
|---|---|
| Observation data:epoch | |
| Right ascension | 18h 31m 24.00s[1] |
| Declination | −08° 28′ 0.0″[1] |
| Distance | 8,060 ly (2472 pc) |
| Constellation | Scutum |
| Designations | Sh 2-58, LBN 79[1] |
| See also:Lists of nebulae | |
Sh 2-58 (also known asLBN 79) is an emission nebula visible in the constellation ofScutum.[2][3][4]
Located in the western part of the constellation, about 1° SW of the starAlpha 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.
It is a remoteH II region located on the inner edge of theSagittarius 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 cloudSYCSW 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 sourceRAFGL 5246S.[5][6][7]
The area of sky in which Sh 2-58 is located includes the nearby cloudSh 2-57, from which it is apparently separated by the dark nebulaLDN 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 theScutum-Crux Arm, being at a distance of about 3400 parsecs. Even more distant would be thesupernova remnantW41.[8][9]
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