Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
Sh2-140 - The Hidden Nebula, 



    
        

            Jason Guenzel
Sh2-140 - The Hidden Nebula
Powered byPixInsight

Sh2-140 - The Hidden Nebula

Sh2-140 - The Hidden Nebula, 



    
        

            Jason Guenzel
Sh2-140 - The Hidden Nebula
Powered byPixInsight

Sh2-140 - The Hidden Nebula

Equipment

Imaging Telescopes Or Lenses
Celestron EdgeHD 8"
Imaging Cameras
ZWO ASI1600MM-Cool
Mounts
Orion Atlas Pro AZ/EQ-G
Filters
Astronomik H-alpha 6nm CCD 1.25" · Astronomik Deep-Sky R 1.25" · Astronomik Deep-Sky G 1.25" · Astronomik Deep-Sky B 1.25" · Astronomik L-3 UV-IR Block 1.25"
Accessories
Moonlite CHL 2.5" Large Format Crayford Edge Focuser · Orion Thin Off-Axis Guider (TOAG) · Celestron 0.7x Focal Reducer
Software
Sequence Generator Pro · PixInsight · Adobe Photoshop · PHD 2
Guiding Telescopes Or Lenses
Celestron EdgeHD 8"
Guiding Cameras
ASI120MM

Acquisition details

Dates:
Sept. 27, 2018 ·  Sept. 28, 2018 ·  Oct. 8, 2018 ·  Oct. 9, 2018 ·  Oct. 10, 2018 ·  Oct. 14, 2018 ·  Oct. 15, 2018 ·  Oct. 16, 2018 ·  Oct. 17, 2018 ·  Oct. 18, 2018 ·  Oct. 19, 2018 ·  Oct. 22, 2018
Frames:
Astronomik Deep-Sky B 1.25": 30x240" (2h) (gain: 0.00) -20°C bin 1x1
Astronomik Deep-Sky G 1.25": 30x240" (2h) (gain: 0.00) -20°C bin 1x1
Astronomik Deep-Sky R 1.25": 30x240" (2h) (gain: 0.00) -20°C bin 1x1
Astronomik H-alpha 6nm CCD 1.25": 200x240" (13h 20') (gain: 139.00) -20°C bin 1x1
Astronomik L-3 UV-IR Block 1.25": 237x180" (11h 51') (gain: 0.00) -20°C bin 1x1
Integration:
31h 11'
Darks:
50
Flats:
50
Bias:
256
Avg. Moon age:
10.33 days
Avg. Moon phase:
49.40%
Bortle Dark-Sky Scale:
5.00

Basic astrometry details

Astrometry.net job: 2373396

RA center: 22h19m19s.9

DEC center: +63°1836

Pixel scale: 0.526 arcsec/pixel

Orientation: 90.659 degrees

Field radius: 0.383 degrees

Resolution: 4236x3078

Data source: Backyard

Description

This view into deep space reveals a pocket of hydrogen emission (Ha) peeking out behind a large dust cloud. Fortunately, looking with high magnification reveals some additional detail. You can see towering wisps and columns of Ha gas, but the foreground dark nebula obscures the view just as it gets interesting! It kind of makes you want to peek around the corner, doesn't it? Scientific studies in the infrared have indicated a cluster of young energetic stars inhabit this pocket and are actively working to shape these structures.



This area of space is catalogued under a few different names. Sharpless2-140 (Sh2-140) refers to the hydrogen alpha emission and Lynd's 1204/2304 (LDN 1204/2304) is the dark nebula throughout frame. It is immediately apparent that the dark nebula hangs in front due to the lack of stars in the area. There are actually a few interesting features here too, in particular a miniature dark snake to the upper left.

The stars in this image were quite overpowering, as was the brightness of the central pocket. I dimmed down both in postprocessing in an effort to reveal the structure to the observer. I hope it worked! Though this is not an tremendously uncommon target, the inner detail is not something you see every day so I focused on showcasing that as best as I could. I've taken up the hobby of visualizing where these objects are in the "big picture". It sits in Cepheus, between roughly between the more commonly imaged Lobster Claw and the Squid.

Enjoy!

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