Whirlpool Galaxy (M51) in LRGB

The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy.
Its distance is estimated to be between 15 and 35 million light-years.

www.astrobin.com/347434

Technical card
Imaging telescope or lens:Altair Astro RC250-TT 10" RC Truss Tube
Imaging camera:ZWO ASI1600MM-Cool
Mount:Skywatcher AZ EQ-6 GT
Guiding telescope or lens:Teleskop Service TSOAG9 Off-Axis Guider
Guiding camera:QHYCCD QHY5III174
Focal reducer:Astro-Physics CCDT67 – 0.67x Reducer
Software:Main Sequence Software Seqence Generator Pro, Pleiades Astrophoto PixInsight
Filters:Optolong CLS – CCD (V4) 36mm, ZWO red, ZWO green, ZWO blue
Accessories:MoonLite CSL 2.5" Focuser with High Res Stepper Motor, ZWO EFW
Resolution: 3892×2892
Dates: March 3, 2017, May 17, 2018
Frames:
Optolong CLS – CCD (V4) 36mm: 90×120" (gain: 75.00) -20C bin 1×1
ZWO blue: 25×60" (gain: 139.00) -20C bin 1×1
ZWO green: 25×60" (gain: 139.00) -20C bin 1×1
ZWO red: 28×60" (gain: 139.00) -20C bin 1×1
Integration: 4.3 hours
Avg. Moon age: 3.74 days
Avg. Moon phase: 16.80%
Astrometry.net job: 2065334
RA center: 202.470 degrees
DEC center: 47.199 degrees
Pixel scale: 0.549 arcsec/pixel
Orientation: 269.057 degrees
Field radius: 0.369 degrees
Locations: Berga Resort, Berga, Barcelona, Spain

via Flickr https://flic.kr/p/26LVvtv