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Sh2-84 (Emission Nebula)


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Sh2-84
Emission Nebula (散光星雲)
Nb EN


別名 (Other names)

Sharpless 84, Sh 2-84, LBN 131, Avedisova 857

星座 (Constellation)
や座 (Sge) (Sagitta)

座標 (Coordinates)
(55.84°, -3.79°)

距離 (Distance)
16,300光年 (16,300 light-years)

Sh2-84 is an emission nebula located 16,300 light years from the Earth in the constellation Sagitta.

Sh2-84 (Emission Nebula) : Picture

Sh2-84 (Emission Nebula)
Sh2-84 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
This small but somewhat brighter nebula is a nice object for those that have larger telescopes. The brighter nebula in the middle is SH2-84 which is surrounded by a nice amount of nebulosity for those that have a nice wide field of few. With a larger telescope you may pick up some more structure. The region responds very well to the hydrogen alpha filter but picks up weak using standard RGB filters. I did not pick up anything with the oxygen III in a 15 minute exposure but a larger telescope may have better luck.

Sh2-84 (Emission Nebula)
Sh2-84 (Emission Nebula)
(C) http://galaxymap.org/
This HII region, also called LBN 131, is near in the sky to the Wolf-Rayet star WR 128. Both Sharpless and Avedisova list WR 128 as an ionising star. However, there is some controversy about whether Sh 2-84 is part of the ring nebula surrounding this star or lies at another distance.

A look at this region in hydrogen-alpha reveals that although WR 128 lies in this direction, Sh 2-84 appears to be the brightest part of an enormous ring of ionised gas that is not centred on WR 128 but may instead surround the O7.5 I supergiant QZ Sge. Given the size of the ring it may be much closer than the Wolf-Rayet star.

It also seems possible that both QZ Sge and WR 128 contribute to the nebulosity seen in this direction and so Sh 2-84 is not a single object.

Sh2-84 (Emission Nebula)
Sh2-84 (Emission Nebula)
(C) Palomar Observatory

Sh2-84 (Emission Nebula)
Sh2-84 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
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