Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
A Narrow Cave, 


A Narrow Cave
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A Narrow Cave

Technical card

Imaging telescopes or lenses: Tele Vue NP 101

Imaging cameras: Atik One

Mounts: Orion Atlas Pro EQ Orion Atlas Pro AZ/EQ-G

Guiding cameras: Atik GP

Software: SequenceGeneratorPro

Filters: OIII 3nm  ·  Astrodon Ha 5mm  ·  SII 3nm

Dates:Sept. 7, 2016

Frames: 80x600"

Integration: 13.3 hours

Avg. Moon age: 5.60 days

Avg. Moon phase: 31.53%

Basic astrometry details

Astrometry.net job: 1235716

RA center: 22h 57' 14"

DEC center: +62° 36' 10"

Pixel scale: 1.716 arcsec/pixel

Orientation: -176.239 degrees

Field radius: 0.755 degrees

Resolution: 2532x1902

Locations: Howling Moon Observatory, SoCal, CA, None


The Cave Nebula (Sh2-155) in narrowband.

Due to continuing fog here, I decided to bin the images 2x2 and go for shorter subs. It took 12 nights over late august and early september to get enough to make this image.

Image is 40 Ha subs, 21 Oiii subs and 19 Sii subs; Ha subs are 5 minutes, binned 2x2 ... Oiii and Sii are 10 minute subs binned 2x2.

I drizzled the subs and used the Ha as a Lum for this version (Rev A)

Rev A = My preferred green palette
Rev B = My blue-green palette
Rev C = closer to a traditional SHO Hubble palette (but let's face it, I am a little goofi)



  • A Narrow Cave, 


  • A Narrow Cave, 


  • Final
    A Narrow Cave, 



Sky plot

Sky plot


A Narrow Cave,