Emission Nebula Sh2-140 (LBN 505)

Sh2-140 is a hydrogen emission nebula located approximately 3,000 light-years away on the edge of a ring of molecular gas and dust known as the Cepheus Ring. From what I can tell in the literature, Sh2-140, refers to the more dense star forming the bottom edge of the nebular complex while LBN 505 is the nebula as a whole. Larger telescopes can reveal some of the star formation detail in the Sh2-140 region especially using IR filters.

There are many other objects in this field such as reflection nebulae, a star cluster, and colorful stars. The bright yellow star on the right is known as 25 Cep (25 brightest star in Cepheus). Up near the top the bright blue star has some blue reflection which also seems to be associated with an emission nebula, LBN 500. On the lower right side of the image there is another blue reflection nebula named vdB 153 which is adjacent to reflection nebula LBN 508.

Sh2-140 (LBN 505)
Dates: 6-29-23, 7-6, 7-10, 7-11
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: Antlia Ha, ZWO L, R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: Ha 79 x 300, L 87 x 90, R 69 x 90, G 62 x 90, B 68 x 90
Gain: 139
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, Bill Blanshan Masks.

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