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Contains:  M 3, NGC 5272
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M 3, NGC 5272, 


M 3, NGC 5272

M 3, NGC 5272

Technical card

Imaging telescope or lens:Ньютон 380 F/3,5

Imaging camera:ZWO ASI 294MC Pro

Mount:EQ 8

Guiding telescope or lens:Ньютон 380 F/3,5

Guiding camera:QHY163M

Resolution: 1674x1561

Dates:Feb. 19, 2019

Frames: 3600x4"

Integration: 4.0 hours

Avg. Moon age: 14.59 days

Avg. Moon phase: 99.96% job: 2533247

RA center: 205.541 degrees

DEC center: 28.381 degrees

Pixel scale: 1.021 arcsec/pixel

Orientation: 134.239 degrees

Field radius: 0.325 degrees

Locations: Домашняя обсерватория, Заречье, Московская область, Russian Federation

Data source: Backyard


Messier 3 is just one of the 250 other globular clusters in our galaxy. Removed at 38,800 light-years from the galactic center and located 3,600 light-years above the plane.
A dense nucleus in diameter takes 11 light-years, but the entire cluster stretches for 180 light-years. Estimated age-8-11.4 billion years. Holds old red stars as well as many variables.
Edward Pickering found the first variable NGC 5272 in 1889. Another 87 found Solon Bailey in 1895, and then another 138 in 1913. Interestingly, variables still appear in the cluster. Today there are 274 of them (more than in any other of this type). Approximately 170 are in the RR Lyra variables.
Also in M 3 a lot of blue stragglers, seeming younger and brighter than the rest (in the main sequence). Now I believe that they were the result of stellar mergers. M3 – prototype clusters Oosterhoff type I – rich in metal or with a large number of elements different from hydrogen and helium.