Next one from the Sharpless catalogue of faint nebulae.
It’s not a common object, and of course… it’s faint.
Sh2-170 is an emission nebula in Cassiopeia at around 7500 light years away.
Always taken pictures of the past, something that happened 7500 year a go and now arrive to the earth.
The bright star at the centre of the nebula is ionising the surrounding hydrogen gas, causing the nebula to glow.
This nebula is about 2/3 the diameter of the full moon.

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: 2328×1760

Dates:Dec. 20, 2018, Dec. 31, 2018, Jan. 4, 2019

Astrodon B Gen.2 E-series 36mm: 45×10" (gain: 200.00) -20C bin 1×1
Astrodon G Gen.2 E-series 36mm: 45×10" (gain: 200.00) -20C bin 1×1
Astrodon HA 36mm – 5nm: 49×600" (gain: 200.00) -20C bin 1×1
Astrodon O-III 36mm – 5nm: 20×600" (gain: 200.00) -20C bin 1×1
Astrodon R Gen.2 E-series 36mm: 45×10" (gain: 200.00) -20C bin 1×1
Astrodon S-II 36mm – 5nm: 20×600" (gain: 200.00) -20C bin 1×1

Integration: 15.2 hours

Avg. Moon age: 21.55 days

Avg. Moon phase: 41.22%

Astrometry.net job: 2520233

RA center: 0.393 degrees

DEC center: 64.618 degrees

Pixel scale: 2.932 arcsec/pixel

Orientation: 268.622 degrees

Field radius: 1.189 degrees

Locations: AAS Montsec, Àger, Lleida, Spain

Data source: Own remote observatory

Remote source: Non-commercial independent facility

via Flickr https://flic.kr/p/247nYpF

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