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Contains:  NGC 4712, NGC 4725, NGC 4747
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Arp 159: NGC 4725 (the One-Armed Galaxy), NGC 4747, NGC 4712

Technical card

Dates:April 2, 2020April 12, 2020April 14, 2020April 16, 2020April 17, 2020April 19, 2020April 21, 2020April 23, 2020April 28, 2020May 10, 2020May 11, 2020May 13, 2020May 14, 2020May 31, 2020June 1, 2020June 2, 2020June 8, 2020June 9, 2020June 10, 2020June 14, 2020June 15, 2020

Blue: 95x150"
Green: 97x150"
Baader IR-Cut Moon & Skyglow Neodymium: 205x150"
Red: 138x150"

Integration: 22.3 hours

Avg. Moon age: 17.68 days

Avg. Moon phase: 53.16%

Bortle Dark-Sky Scale: 7.50

Basic astrometry details job: 3619318

RA center: 12h 51' 4"

DEC center: +25° 37' 51"

Pixel scale: 0.688 arcsec/pixel

Orientation: 3.942 degrees

Field radius: 0.531 degrees

Resolution: 4500x3264

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard


This image concludes #GalaxyQuest2020 and will thus be my last galaxy image at least until October or November. Happy first day of summer!



Chris Sullivan
License: None (All rights reserved)

Sky plot

Sky plot


Arp 159: NGC 4725 (the One-Armed Galaxy), NGC 4747, NGC 4712, 


            Chris Sullivan