HII-Emission nebula in Cepheus
Sh2-140 is an HII emission nebula at the edge of the Lynds dark nebula 1204 and is also part of the Cepheus ring, the expanding envelope of gas and dust surrounding the area around Cep OB2.
|Date of exposures:||03.05.2018, 04.05.2018, 05.05.2018|
|Exposures:||Ha 5nm: 49 x 180", Luminance: 9 x 180", RGB: 162 x 180", Sum: 11 hrs.|
|Telescope:||10'', F4 Newton|
|Filter:||Astrodon LRGB E-Series, H-Alpha 5nm|
|Camera:||ASI 1600 MMC Pro|
|Guiding:||Off Axis Guider, Lodestar|
The bright edge is formed by the B0.5 V double star HD 211880, which ionizes a Bok sphere in the southwest of the LDN 1204 molecule cloud (appears as a dark region against the background of the emission nebula). Invisible in this image are about fifty young stars deeply embedded in the dark gas of LDN 1204 in the lower right corner of the image.