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Contains:  M 3, NGC 5272
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M3 Globular Cluster (NGC 5272), 


            Douglas J Struble
M3 Globular Cluster (NGC 5272)

M3 Globular Cluster (NGC 5272)

Technical card

Resolution: 2642x2113

Dates:April 26, 2018

Astrodon Blue Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1

Integration: 3.0 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 11.19 days

Avg. Moon phase: 86.21%

Bortle Dark-Sky Scale: 6.00 job: 2034973

RA center: 205.543 degrees

DEC center: 28.381 degrees

Pixel scale: 0.648 arcsec/pixel

Orientation: 290.650 degrees

Field radius: 0.305 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


Messier 3 (M3) is a globular cluster located in the constellation Canes Venatici, the Hunting Dogs.

Messier 3 is one of the brightest, largest globular clusters in the sky. It has an apparent magnitude of 6.2 and is approximately 33,900 light years distant from Earth. It has the designation NGC 5272 in the New General Catalogue.

Messier 3 is one of the most popular targets among amateur astronomers next to Messier 13, the Hercules Globular Cluster, and one of the most studied of all known globular clusters.

It has an absolute magnitude of about -8.93 and a luminosity about 300,000 times that of the Sun. The cluster is approaching us at 147.6 km/s.

M3 contains an estimated half a million stars. The brightest stars in the cluster are of magnitude 12.7 and the average brightness of the 25 brightest stars is 14.23 mag.

The overall spectral type of M3 is F2. The cluster has a total mass of about 450,000 solar masses.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M3 Globular Cluster (NGC 5272), 


            Douglas J Struble