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I agreeImaging telescope or lens:William Optics Star 71 f/4.9
Imaging camera:ZWO ASI183MC Pro
Mount:Celestron AVX Mount
Guiding telescope or lens:Agena Astro 50mm f/3.9 Guidescope
Guiding camera:ASI224MC
Software:Stark Labs Nebulosity 4.2, Digital Photo Professional, IDEIKI AstroPhotography Tool (APT), PHD2 Guiding, SharpCap Pro 3.1
Filter:Optolong L
Resolution: 4500x3000
Dates:April 3, 2019
Frames:Optolong L: 53x240" (gain: 111.00) -15C bin 1x1
Integration: 3.5 hours
Darks: ~30
Avg. Moon age: 27.81 days
Avg. Moon phase: 3.32%
Bortle Dark-Sky Scale: 4.00
Mean SQM: 20.70
Mean FWHM: 4.00
Temperature: 7.00
Astrometry.net job: 2761957
RA center: 12h 27' 34"
DEC center: +13° 8' 9"
Pixel scale: 1.434 arcsec/pixel
Orientation: 359.577 degrees
Field radius: 1.077
Data source: Traveller
Markarian's Chain is a stretch of galaxies that forms part of the Virgo Cluster. When viewed from Earth, the galaxies lie along a smoothly curved line. Charles Messier first discovered two of the galaxies, M84 and M86, in 1781. The other galaxies seen in the chain were first mentioned in John Louis Emil Dreyer's New General Catalogue, published in 1888. It was ultimately named after the Armenian astrophysicist, Benjamin Markarian, who discovered their common motion in the early 1960s. Member galaxies include the brighter lenticular galaxies, M84 (NGC 4374), M86 (NGC 4406), as well as NGC 4477, NGC 4473, NGC 4461, NGC 4458, NGC 4438 and NGC 4435.The chain of galaxies spans over 1.5 degrees (three full moons) on the border between Virgo and Coma Berenices. The galaxies are between 50 and 70 million light years away.
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