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Contains:  Sh2-155, VdB155
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Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB, 


            Nico Carver
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Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB

Technical card

Dates:June 3, 2019June 11, 2019June 14, 2019June 22, 2019July 1, 2019July 2, 2019July 3, 2019July 14, 2019July 15, 2019Aug. 1, 2019Aug. 9, 2019Aug. 10, 2019Aug. 24, 2019Aug. 25, 2019Aug. 29, 2019Aug. 30, 2019Sept. 16, 2019Sept. 17, 2019Sept. 18, 2019Sept. 19, 2019Sept. 21, 2019Sept. 27, 2019Sept. 28, 2019Oct. 4, 2019

Astrodon B Gen.2 E-series: 64x300" (gain: 0.00) -15C bin 1x1
Astrodon G Gen.2 E-series: 57x300" (gain: 0.00) -15C bin 1x1
Astrodon L Gen.2 E-series: 50x300" (gain: 0.00) -15C bin 1x1
Astrodon R Gen.2 E-series: 59x300" (gain: 0.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 3nm OIII: 222x300" (gain: 200.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 5nm Ha: 297x300" (gain: 200.00) -15C bin 1x1

Integration: 62.4 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 15.73 days

Avg. Moon phase: 45.32%

Bortle Dark-Sky Scale: 6.25

Mean SQM: 19.27 job: 2977180

RA center: 22h 59' 22"

DEC center: +62° 24' 44"

Pixel scale: 2.425 arcsec/pixel

Orientation: 15.367 degrees

Field radius: 1.789 degrees

Resolution: 4355x3038

Data source: Traveller


n. Spelunking: the exploration of caves, especially as a hobby

This is a two panel mosaic that I shot from June through October 2019. I also shot Near IR and SII data that I didn't end up using. Maybe some other time.

Narrowband was shot in Somerville, MA (SQM reading at zenith = 18.0 mpsas). Broadband was shot at the ATMOB Clubhouse in Westford, MA. (SQM reading at zenith = 20.17 mpsas)



Nico Carver
License: Attribution-ShareAlike Creative Commons


  • Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB, 


            Nico Carver
  • Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB, 


            Nico Carver
  • Final
    Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB, 


            Nico Carver


Description: Annotated version


Description: A bit darker / changed reds. It looked a bit weird on certain monitors.

Sky plot

Sky plot


Spelunking - Sh2-155 (Cave Nebula) in HAOIIILRGB, 


            Nico Carver