Sh2-187 HaLRGB

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Object: Sh2-187
Date of exposures: 23.11.2016, 27.11.2016, 28.11.2016
Exposures: Lum: 33 x 600 Sek., RGB: 49 x 360 Sek., Ha: 4 x 900 Sek., Gesamt: 11,4 Std.
Telescope: 10'', F4 Newton
Focal length: 1000 mm
Filter: Astrodon H-Alpha 5nm, Astrodon RGB E-Series, Astronomik CLS
Camera: Atik 460Exm
Guiding: Off Axis Guider mit Lodestar
Mount: EQ8

This is an H II region located on the outermost edge of the Orion Arm, surrounded by dark nebula LDN 1317. The distance was estimated in about 4.700 light years. The cloud belongs to a large molecular complex. The visible part of the cloud is surrounded by an extended envelope of neutral hydrogen. Its age can be estimated around to 100-200.000 years.