Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5251  ·  NGC 5263  ·  NGC 5272
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M3, 



    
        

            Joey Troy
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M3

Getting plate-solving status, please wait...
M3, 



    
        

            Joey Troy
Powered byPixInsight

M3

Equipment

Imaging Telescopes Or Lenses
William Optics Redcat 51
Imaging Cameras
ZWO ASI533MC Pro
Mounts
Sky-Watcher EQM-35 Pro
Accessories
ZWO ASIair Pro · ZWO EAF
Software
Pleiades Astrophoto PixInsight
Guiding Telescopes Or Lenses
ZWO Mini Guider Scope
Guiding Cameras
ZWO ASI120MM Mini

Acquisition details

Dates:
April 16, 2021 ·  April 18, 2021
Frames:
32x180" (1h 36') (gain: 101.00) -10°C
Integration:
1h 36'
Darks:
10
Flats:
10
Bias:
10
Avg. Moon age:
4.83 days
Avg. Moon phase:
24.61%
Bortle Dark-Sky Scale:
3.00

RA center: 13h42m13s.64

DEC center: +28°2245.6

Pixel scale: 1.572 arcsec/pixel

Orientation: 90.108 degrees

Field radius: 1.760 degrees

More info:Open 

Resolution: 5700x5700

Data source: Backyard

Description

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,[8] 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.[9] 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.[10]

Many amateur astronomers consider it one of the finest northern globular clusters, following only Messier 13.[1] M3 has an apparent magnitude of 6.2,[4] making it a difficult naked eye target even with dark conditions. With a moderate-sized telescope, the cluster is fully defined. It can be found by looking almost exactly halfway along the north-west line that would join Arcturus (α Boötis) to Cor Caroli (α Canum Venaticorum). Using a telescope with a 25 cm (9.8 in) aperture, the cluster has a bright core with a diameter of about 6 arcminutes and spans a total of double that.[1]

This cluster is one of the largest and brightest, and is made up of around 500,000 stars.[9] It is estimated to be 11.4 billion years old.[7] It is centered at 32,615.64 light-years (10 kpc) away from Earth.[11]

Messier 3 is quite isolated as is 31.6 kly (9.7 kpc) above the Galactic plane and roughly 38.8 kly (11.9 kpc) from the center of the Milky Way. It contains 274 known variable stars, by far the most found in any globular cluster. These include 133 RR Lyrae variables, of which about a third display the Blazhko effect of long-period modulation. The overall abundance of elements other than hydrogen and helium, what astronomers term the metallicity, is in the range of −1.34 to −1.50 dex. This value gives the logarithm of the abundance relative to the Sun; the actual proportion is 3.2–4.6% of the solar abundance. Messier 3 is the prototype for the Oosterhoff type I cluster, which is considered "metal-rich". That is, for a globular cluster, Messier 3 has a relatively high abundance of heavier elements.[12]

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M3, 



    
        

            Joey Troy