Sh 2-58
Sh 2-58 is an emission nebula visible in the constellation of Scutum.
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, 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 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.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.