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Sh2-57 (Emission Nebula)


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Sh2-57
Emission Nebula (散光星雲)
Nb EN


別名 (Other names)

Sharpless 57, Sh 2-57, LBN 78

星座 (Constellation)
たて座 (Sct) (Scutum)

座標 (Coordinates)
(22.89°, 0.68°)

距離 (Distance)

Sh2-57 (Sharpless 57) is an emission nebula in the constellation Scutum.

Sh2-57 (Emission Nebula) : Picture

Sh2-57 (Emission Nebula)
Sh2-57 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
Sh2-57 is the smaller nebula seen near the bottom. The nebula responds very well to the hydrogen-alpha filter. With a long exposure using the color RGB filters, you can create a nice HA-RGB image of this object. Also seen here is SH2-58 which is larger and brighter than the SH2-57. I did try a sub frame using the oxygen III filter but did not pick up anything to justify doing a color narrowband image. A wider field of view will also show more of the Milky Way which will display a better contrast with the darker areas seen in this image.

Sh2-57 (Emission Nebula)
Sh2-57 (Emission Nebula)
(C) http://galaxymap.org/
The tiny nebula Sh 2-57 is ionised by the B0.5 III giant BD -8 4623 within the Sct OB2 association in the Sagittarius arm.

Sh 2-57 and Sh 2-58 are visible together in the sky (as shown by this hydrogen-alpha image), divided by the dark nebula LDN 446 and just east of the Scutum Supershell. However, they seem to be located at quite different distances, with Sh 2-58 at about the same distance as the Supershell and Sh 2-57 in front of this region.

Sh2-57 (Emission Nebula)
Sh2-57 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
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