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Sh2-107 (Emission Nebula)


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Sh2-107
Emission Nebula (散光星雲)
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別名 (Other names)

Sharpless 107, Sh 2-107

星座 (Constellation)
はくちょう座 (Cyg) (Cygnus)

座標 (Coordinates)
(77.37°, -3.7°)

距離 (Distance)

Sh2-107 is an emission nebula in the constellation Cygnus.

Sh2-107 (Emission Nebula) : Picture

Sh2-107 (Emission Nebula)
Sh2-107 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
This is a nice small object which is not far from Sharpless 103, also known as the Veil Nebula. With a larger telescope you could pick up some fine structure on the left side of the nebula where the darker riffs are seen. However a system with a large field of view will also enjoy this area as it is flooded with nebula all around it. The area picks up best using the hydrogen-alpha filter but you can use a red luminance if you do not have one. The nebula is quite faint in the RGB channels so you need a long exposure with the color filters to pick up anything worth using. I did a composite for this one using the H-Alpha blended in with the red and blue channels. There is a small nebula of some kind near the top center near a small bright star.

Sh2-107 (Emission Nebula)
Sh2-107 (Emission Nebula)
(C) http://galaxymap.org/
Very little about this tiny and very faint nebula located well below the galactic plane appears in the scientific literature.

Sharpless suggests that Sh 2-107 may be ionised by the B2 class HD 197460. SIMBAD says that this star is actually a B0.5 Ib supergiant and according to this catalog entry, the star has 9.5 +/- 0.2 solar masses and an age of 22.6 +/- 2.7 million years.

Humphreys gives a distance estimate of 2000 parsecs for HD 197460 (and a slightly different class of B1 II(N)). This is at the lower limit of the distance estimate for Sh 2-107 so it is indeed conceivable that this star ionises the nebula.

Sh2-107 (Emission Nebula)
Sh2-107 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com
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