Sh2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity.
It is widely known as the Cave Nebula, is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.
(description credits: wikipedia)
Technical card
Imaging telescope or lens:Teleskop Service TS Photoline 107mm f/6.5 Super-Apo
Imaging camera:ZWO ASI1600MM-Cool
Mount:Astro-Physics Mach-1 GTO CP4
Guiding telescope or lens:Celestron OAG Deluxe
Guiding camera:QHYCCD QHY5III174
Focal reducer:Riccardi Reducer/Flattener 0.75x
Software:Main Sequence Software Seqence Generator Pro, Astro-Physics AAPC, Pleiades Astrophoto PixInsight
Filters:Astrodon HA 36mm – 5nm, Astrodon B Gen.2 E-series 36mm, Astrodon G Gen.2 E-series 36mm, Astrodon R Gen.2 E-series 36mm, Astrodon S-II 36mm – 5nm, Astrodon O-III 36mm – 5nm
Accessories:ZWO EFW, MoonLite NiteCrawler WR30
Resolution: 1656×2230
Dates:Oct. 5, 2018, Oct. 7, 2018, Nov. 2, 2018, Nov. 6, 2018
Frames:
Astrodon B Gen.2 E-series 36mm: 23×1" (gain: 200.00) -20C bin 1×1
Astrodon G Gen.2 E-series 36mm: 23×1" (gain: 200.00) -20C bin 1×1
Astrodon HA 36mm – 5nm: 50×300" (gain: 200.00) -20C bin 1×1
Astrodon O-III 36mm – 5nm: 23×300" (gain: 200.00) -20C bin 1×1
Astrodon R Gen.2 E-series 36mm: 23×1" (gain: 200.00) -20C bin 1×1
Astrodon S-II 36mm – 5nm: 23×300" (gain: 200.00) -20C bin 1×1
Integration: 8.0 hours
Avg. Moon age: 26.41 days
Avg. Moon phase: 13.11%
Astrometry.net job: 2365517
RA center: 344.185 degrees
DEC center: 62.624 degrees
Pixel scale: 2.932 arcsec/pixel
Orientation: 359.390 degrees
Field radius: 1.131 degrees
Locations: Berga Resort, Berga, Barcelona, Spain
Data source: Backyard
via Flickr https://flic.kr/p/2a7e5fL