Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5263  ·  NGC 5272
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M3 Globular Cluster, 


            Gebhard Maurer
M3 Globular Cluster
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M3 Globular Cluster

Technical card

Imaging telescopes or lenses: Skywatcher Newton 200/1000 PDS

Imaging cameras: ZWO ASI ASI1600MM Pro

Mounts: Skywatcher AZ-EQ6 Pro

Guiding telescopes or lenses: Artesky 60mm Ultraguide

Guiding cameras: ZWO ASI 120mm Mini Mono

Software: Nighttime Imaging 'N' Astronomy  ·  PixInsight PixInsinght 1.8

Filters: ZWO 36mm B  ·  ZWO 36mm G  ·  ZWO 36mm R  ·  ZWO 36mm L

Dates:April 6, 2020

ZWO 36mm B: 34x60" (gain: 139.00) -20C bin 1x1
ZWO 36mm G: 39x60" (gain: 139.00) -20C bin 1x1
ZWO 36mm L: 115x30" (gain: 139.00) -20C bin 1x1
ZWO 36mm R: 29x60" (gain: 139.00) -20C bin 1x1

Integration: 2.7 hours

Darks: ~50

Flats: ~50

Bias: ~50

Avg. Moon age: 12.88 days

Avg. Moon phase: 96.02%

Bortle Dark-Sky Scale: 4.00

Mean FWHM: 4.50

Temperature: 10.00

Basic astrometry details

Astrometry.net job: 3949187

RA center: 13h 41' 15"

DEC center: +28° 18' 32"

Pixel scale: 0.782 arcsec/pixel

Orientation: 156.067 degrees

Field radius: 0.597 degrees

Resolution: 4428x3256

Locations: Backyard, Raglitz, Niederösterreich, Austria

Data source: Backyard


Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered on May 3, 1764 and was the first Messier object to be discovered by Charles Messier himself. Messier originally mistook the object for a nebula without stars. This mistake was corrected after the stars were resolved by William Herschel around 1784. Since then, it has become one of the best-studied globular clusters. Identification of the cluster's unusually large variable star population was begun in 1913 by American astronomer Solon Irving Bailey and new variable members continue to be identified up through 2004.


Sky plot

Sky plot


M3 Globular Cluster, 


            Gebhard Maurer