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Contains:  NGC 7510
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Sh2-157 and NGC-7510, 


            Joel Shepherd
Sh2-157 and NGC-7510

Sh2-157 and NGC-7510

Technical card

Resolution: 1280x1160

Dates:Oct. 27, 2017Oct. 28, 2017Oct. 30, 2017

Astrodon 5nm H-alpha: 20x600" bin 1x1
Astrodon 5nm Olll: 20x600" bin 1x1

Integration: 6.7 hours

Avg. Moon age: 8.23 days

Avg. Moon phase: 58.67%

Bortle Dark-Sky Scale: 6.00 job: 1821800

RA center: 348.798 degrees

DEC center: 60.235 degrees

Pixel scale: 3.791 arcsec/pixel

Orientation: 280.590 degrees

Field radius: 0.909 degrees

Locations: Home, Seattle, WA, United States

Data source: Backyard


Subject: Sh2-157, an emission nebula in Cassiopeia, approximately 11050 light-years distant. The (northern) ring-shaped area is formed by stellar winds from several prominent stars. The bulbous southern area is excited by O-class stars.

Capture notes: Hoowee. This was not easy, but mostly due to human error. My first night of Ha had to be thrown out when I discovered the target was well off-center. When the weather finally cleared, I had to throw out another 90 minutes of O-iii because the nebula slipped below the roofline of our house. The Ha was captured on the last night this year that I could have possibly captured it, due to our reversion to standard time and the encroaching weather. It was tight, but it turned out well in the end.

Processing: Tonemapping of the Ha and O-iii stacks, luminance from the Ha stack with the O-iii tone map added in. Palette is basically HOO, but green has a little bit (20%) of Ha in the mix.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


Sh2-157 and NGC-7510, 


            Joel Shepherd