The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies.
The cluster’s mean distance from Earth is 99 Mpc (321 million light years).
Dark Matter theory began by looking here….

I annotated 196 on this picture, please see revision B for annotated version.

www.astrobin.com/347408/B

I love to see the vastness of space when I see things like this.

www.astrobin.com/347408/

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 Blue 36mm, Optolong Green 36mm, Optolong Red 36mm, Optolong CLS – CCD (V4) 36mm

Accessories:MoonLite CSL 2.5" Focuser with High Res Stepper Motor, ZWO EFW

Resolution: 4148×3344

Dates: March 26, 2018

Frames:
Optolong Blue 36mm: 20×90" (gain: 75.00) -20C bin 1×1
Optolong CLS – CCD (V4) 36mm: 20×300" (gain: 75.00) -20C bin 1×1
Optolong Green 36mm: 20×90" (gain: 75.00) -20C bin 1×1
Optolong Red 36mm: 20×90" (gain: 75.00) -20C bin 1×1

Integration: 3.2 hours

Avg. Moon age: 9.38 days

Avg. Moon phase: 70.60%

Astrometry.net job: 2065222

RA center: 195.093 degrees

DEC center: 27.936 degrees

Pixel scale: 0.559 arcsec/pixel

Orientation: 270.978 degrees

Field radius: 0.414 degrees

Locations: Berga Resort, Berga, Barcelona, Spain

via Flickr https://flic.kr/p/27jpAd4

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