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Sh2-44 (Emission Nebula)


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Sh2-44
Emission Nebula (散光星雲)
Nb EN


別名 (Other names)

Sharpless 44, Sh 2-44, RCW 157, Gum 79, IC 4701, LBN 56

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

座標 (Coordinates)
(14.2°, -0.1°)

距離 (Distance)

Sh2-44 (RCW 157) is an emission nebula in the constellation Sagittarius.

Sh2-44 (Emission Nebula) : Picture

Sh2-44 (Emission Nebula)
Sh2-44 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
This is a very large nebula that is missed because of the nearby famous nebula Messier 17 or the Swan Nebula. With a wide field of view (maybe three degrees) you can get them both in the same shot. The nebula does very well with a hydrogen-alpha filter to the point that I would recommend using that as a luminance. By taking enough RGB for color, you should be able to produce a very nice color image of this. A larger telescope should be able to pick up the fine detail on the left side where it is brightest.

Sh2-44 (Emission Nebula)
Sh2-44 (Emission Nebula)
(C) http://galaxymap.org/
This huge almost circular nebula is very prominent in hydrogen-alpha as can be seen in this SuperCOSMOS image.

Avedisova concludes that it is ionised by the O6 V star HD 167633. Humphreys places this star in the Ser OB1 association in the Sagittarius arm.

However, several other sources give larger distance estimates, placing this nebula in the Centaurus arm, where it may be part of the Scutum supershell.

Sh2-44 (Emission Nebula)
Sh2-44 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
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