Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4263  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  NGC 5198  ·  Whirlpool Galaxy
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The Whirlpool Galaxy (M51) in HaRGB, 


            Orestis Pavlou
The Whirlpool Galaxy (M51) in HaRGB
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The Whirlpool Galaxy (M51) in HaRGB

Technical card

Imaging telescopes or lenses: Sky-Watcher ED 100 Black Diamond

Imaging cameras: ZWO ASI294MC Pro

Mounts: Sky-Watcher AZ-EQ6 PRO

Guiding telescopes or lenses: QHYCCD miniGuideScope

Guiding cameras: QHYCCD QHY 5-II

Focal reducers: Skywatcher 0.85x Reducer ED100 Reducer

Software: Astro Photograhy Tool  ·  DeepSkyStacker  ·  PixInsight 1.8.7 Ripley  ·  PHD2 Guiding  ·  Adobe Photoshop CC 2017 Photoshop CC 2017

Filters: Baader Moon and Skyglow Filter  ·  Baader 7nm Ha

Accessory: Pegasus Astro Pocket Powerbox

Dates:May 11, 2020May 20, 2020

Baader 7nm Ha: 30x300" (gain: 120.00) 0C
Baader Moon and Skyglow Filter: 270x120" (gain: 120.00) 0C

Integration: 11.5 hours

Darks: ~30

Flats: ~20

Avg. Moon age: 23.32 days

Avg. Moon phase: 42.18%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details

Astrometry.net job: 4251958

RA center: 13h 29' 57"

DEC center: +47° 13' 51"

Pixel scale: 1.518 arcsec/pixel

Orientation: 313.472 degrees

Field radius: 0.708 degrees

Resolution: 2713x1978

Locations: Home observatory, Nicosia, Nicosia, Cyprus

Data source: Backyard


The Whirlpool Galaxy (M51)
At a distance of about 25 million light-years away, lies an impressive pair of interacting galaxies.
M51 and NGC 5195, seen at the center of this image, are two galaxies 'locked' in a cosmic gravitational dance.
M51 is a spiral galaxy also known as the 'Whirlpool' Galaxy.
The interaction between the two galaxies is thought to have caused increased star formation across the dark-brown regions of concentrated dust and gas, called 'spiral arms'.

This image was created using 11.5 hours of data I collected throughout 5 nights in May 2020.
Total imaging time: 11.5 hours (9 hours in colour + 2.5 hours in Hydrogen-alpha)
Telescope: Sky-Watcher Evostar ED100 Black Diamond
Camera: ZWO ASI294MC Pro
Mount: AZ-EQ6 Pro


Sky plot

Sky plot


The Whirlpool Galaxy (M51) in HaRGB, 


            Orestis Pavlou