Sh2-157 (2025)

This is my latest image of the bright emission nebula, Sh2-157. It is located 8000 light-years away in the constellation Cassiopeia and very large at over 200 light-years across. Many nebulae have idiodic nicknames and I avoid using them but this one does bear some resemblance to a Lobster Claw which is what it is also known as. Several smaller portions on this large complex have their own designation. The small, bright, dense portion in the center is known as Sh2-157a. Other nebular regions within this cloud are LBN 533, LBN 536, LBN 537, LBN 540, and LBN 544. The open cluster NGC 7510 is located on the upper left side of my image while another open cluster, Markarian 50, is found in the lower left portion of the image just above a blue oxygen rich strand. I did do some star reduction on this object but not too much as I like rich colorful starfields. 

Higher Quality:
https://www.astrobin.com/k51hb2/?nc=collection&nce=712

Sh2-157 (2025)
Dates: 8-21-25, 8-22, 8-23, 8-25, 8-27, 9-3
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7 (f/5.6)
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: Antlia Ha, OIII, SII; ZWO R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: Ha 114 x 300, OIII 112 x 300, SII 114 x 300 R 45 x 90, G 52 x 90, B 51 x 90 (32h 02m)
Gain: 139
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, GraXpert, Bill Blanshan Star Reduction, Bill Blanshan Color Masks, Bill Blanshan Stretching, Topaz Denoise.

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