Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  IC 1470  ·  IC1470  ·  Sh2-156
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Sh2-156 & BFS 18, 



    
        

            Gary Imm
Sh2-156 & BFS 18, 



    
        

            Gary Imm

Sh2-156 & BFS 18

Imaging telescopes or lenses: Celestron EdgeHD 11

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

Software: Pixinsight  ·  Main Sequence Software Sequence Generator Pro  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Ha 31mm 5nm  ·  Astrodon OIII 31mm 3nm  ·  Astrodon SII 31mm 5nm  ·  Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW 2″X7  ·  Celestron OAG  ·  MoonLite Focuser for EdgeHD 11


Dates:Sept. 15, 2020Sept. 16, 2020Sept. 17, 2020Sept. 18, 2020

Frames:
Astrodon Blue 31mm Gen2 I-Series: 30x120" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 30x120" (gain: 139.00) -20C bin 1x1
Astrodon Ha 31mm 5nm: 24x300" (gain: 300.00) -20C bin 1x1
Astrodon OIII 31mm 3nm: 24x300" (gain: 300.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 30x120" (gain: 139.00) -20C bin 1x1
Astrodon SII 31mm 5nm: 24x300" (gain: 300.00) -20C bin 1x1

Integration: 9.0 hours

Avg. Moon age: 14.25 days

Avg. Moon phase: 2.12%


Astrometry.net job: 4227376

RA center: 23h 5' 45"

DEC center: +60° 15' 11"

Pixel scale: 0.282 arcsec/pixel

Orientation: -10.779 degrees

Field radius: 0.172 degrees


Resolution: 3550x2614

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This image captures 3 seldom imaged objects located in close proximity in the constellation of Cepheus at a declination of +60 degrees.

The primary object, on the right, is SH2-156, also known as IC 1470. This object is an emission nebula located 9000 light years away. It spans 3 arc-minutes in our apparent view, which corresponds to a width of 7 light years. The nebula is primarily hydrogen but has some stronger OIII and SII content at its center.

On the left side of the image is the BDS2003-42 open cluster and the surrounding BFS 18 HII region. As you might be able to infer from the dim glow of the HII region, these objects are much further away than Sh2-156, at a distance of 28,000 light years.

Near the left-center of the image is the Kronberger 23 open cluster and the surrounding BFS 17 HII region. These objects are shown to be the same distance away as Sh2-156, which seems odd to me. The odd looking bright orange star in this cluster is V* QT Cep, which is a Mira-type variable star. These stars are cool red giants, hundreds of times bigger and thousands of times brighter than our sun.

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