www.astrobin.com/364085

NGC 7635, also known as the Bubble Nebula (at the bottom of the picture), is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575. The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.
NGC 7538, (at the top left of the picture) is located about 9,100 light-years from Earth. It is home to the biggest yet discovered protostar which is about 300 times the size of the Solar System.
(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 S-II 36mm – 5nm, Astrodon O-III 36mm – 5nm, Astrodon B Gen.2 E-series 36mm, Astrodon G Gen.2 E-series 36mm, Astrodon R Gen.2 E-series 36mm

Accessories:ZWO EFW, MoonLite NiteCrawler WR30

Resolution: 2328×1760

Dates: Aug. 21, 2017, Oct. 11, 2017, Aug. 11, 2018, Aug. 21, 2018

Frames:
Astrodon B Gen.2 E-series 36mm: 24×10" (gain: 200.00) -20C bin 1×1
Astrodon G Gen.2 E-series 36mm: 21×10" (gain: 200.00) -20C bin 1×1
Astrodon HA 36mm – 5nm: 46×300" (gain: 200.00) -20C bin 1×1
Astrodon O-III 36mm – 5nm: 15×300" (gain: 200.00) -20C bin 1×1
Astrodon R Gen.2 E-series 36mm: 23×10" (gain: 200.00) -20C bin 1×1
Astrodon S-II 36mm – 5nm: 15×300" (gain: 200.00) -20C bin 1×1

Integration: 6.5 hours

Avg. Moon age: 15.17 days

Avg. Moon phase: 35.21%

Astrometry.net job: 2226092

RA center: 349.246 degrees

DEC center: 60.827 degrees

Pixel scale: 2.939 arcsec/pixel

Orientation: 88.476 degrees

Field radius: 1.191 degrees

Locations: Berga Resort, Berga, Barcelona, Spain

Data source: Backyard

via Flickr https://flic.kr/p/2azPaef

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