Hemisphere:  Northern
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The Cave Nebula (SH2-155) in SHO, 


            Chuck's Astrophot...
The Cave Nebula (SH2-155) in SHO
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The Cave Nebula (SH2-155) in SHO

Technical card

Imaging telescopes or lenses: Explore Scientific ES127mm f/7.5 ED APO triplet

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Celestron CGX

Guiding telescopes or lenses: Orion ST 80

Guiding cameras: Lodestar X2

Focal reducers: Orion 0.8 Reducer

Software: Photoshop CS3  ·  PHD2  ·  Sequence Generator Pro  ·  PixInsight

Filters: Astronomik OIII  ·  Ha  ·  Astronimik SII

Accessory: ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite 2.5" Focuser with MotorFocus  ·  QHYCCD PoleMaster

Dates:Sept. 17, 2018Sept. 22, 2018Oct. 9, 2018

Ha: 183x240" (gain: 139.00) -20C bin 1x1
Astronomik OIII: 105x240" (gain: 75.00) -20C bin 1x1
Astronimik SII: 105x240" (gain: 139.00) -20C bin 1x1

Integration: 26.2 hours

Darks: ~50

Flats: ~50

Bias: ~50

Avg. Moon age: 6.86 days

Avg. Moon phase: 49.55%

Basic astrometry details

Astrometry.net job: 2298565

RA center: 22h 57' 24"

DEC center: +62° 28' 12"

Pixel scale: 1.683 arcsec/pixel

Orientation: 87.862 degrees

Field radius: 0.722 degrees

Resolution: 2469x1853

Data source: Backyard


The weather finally broke and I was able to complete the Cave Nebula after collecting the first light on it around 3 weeks ago. Ha and SII were very strong, but OIII was weak so it took some extra processing work to bring it out.

Thank you to the people that run NASA APOD for selecting this image on November 14, 2018.



Chuck's Astrophot...
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  • The Cave Nebula (SH2-155) in SHO, 


            Chuck's Astrophot...
  • Final
    The Cave Nebula (SH2-155) in SHO, 


            Chuck's Astrophot...


Description: Minor color fix.

Sky plot

Sky plot


The Cave Nebula (SH2-155) in SHO, 


            Chuck's Astrophot...