Messier 25. IC 4725

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Messier 25 is a rather large open cluster, with over 600 stars and is 90 million years old, what makes M25 an old open cluster. It is located 2,000 light years from our Sun in the “Messier-rich” constellation Sagittarius. It spans about 32 arcmin, what makes it one of the largest open clusters in the Messier catalog (although still smaller than M44 or M45.


Additional Information


Name(s): Messier 25. M25. IC 4725

Type: Open Cluster

RA:  18h 31m 46s

Dec: -19º 06’ 55”

Constellation: Sagittarius

Size (arcmin): 32×31 arcmin

Magnitude: +4.5

Distance: 2.000 ly


Date: 2021-06-05

Location:, SSO near Coonabarabran, NSW Australia

Size (arcmin): 53×53

Telescope: 20” f/4.4 Reflector (unguided)

Camera: FLI PL 09000 (3056x3056pix)

Total exposure: 3 hours (RGB, 1 hour each)

Processing: CCDStack, Photoshop CC 2021

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