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Sh2-26 (Emission Nebula)


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Sh2-26
Emission Nebula (散光星雲)
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別名 (Other names)

Sharpless 26, Sh 2-26, RCW 145

星座 (Constellation)
いて座 (Sgr) (Sagittarius)

座標 (Coordinates)
(6.19°, 0.35°)

距離 (Distance)

Sh2-26 (RCW 145) is an emission nebula in the constellation Sagittarius.

Sh2-26 (Emission Nebula) : Picture

Sh2-26 (Emission Nebula)
Sh2-26 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
This large nebula complex is not far from Sh2-30, also known as the Trifid Nebula. The nebula works best using the hydrogen-alpha filter but with enough exposure for color, there is a lot of rich color in in the nebula although it is mostly red. A very wide field of view picks a few Sharpless objects including SH2-25, known as the Lagoon Nebula.

Sh2-26 (Emission Nebula)
Sh2-26 (Emission Nebula)
(C) http://galaxymap.org/
This diffuse nebula is part of the large region of nebulosity near the Trifid nebula that includes RCW 145.

No ionising stars for Sh 2-26 are listed in the scientific literature but the nebula clearly surrounds the O9 III giant LS 4511 so this may be the ionising star.

The RCW catalog identifies RCW 145 with Sh 1-20 = Sh 2-26. However, the corrected BFS coordinates for Sh 2-28 shows that this nebula a better match for the size and direction of RCW 145. The boundary box of RCW 145 does clip part of Sh 2-26, so an argument could be made that RCW 145 includes both Sh 2-26 and Sh 2-28.

Sh2-26 (Emission Nebula)
Sh2-26 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
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