Astrophotography by David Gares

Globular Cluster M3

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M3 is a rich globular cluster of about 500,000 stars including a large number of variables.  It was Charles Messier's first orginal discovery (1764).  William Herschel first resolved M3 into stars, defining it as a cluster around 1784.  M3 appears small but quite impressive visually.  It is partially resolved in my 4" telescope even under bright skies. 

Globular Cluster M3
(Click image to enlarge)


 Object Details:  
 Type:  Globular star cluster
 Constellation:  Canes Venatici
 Distance:  33,900 light-years
 Diameter:  About 180 light-years

 Upper Image Details: 

 Date:  Mar. 25, 2012
 Site:  Harahan, LA
 Exposure:  CCD, 15 x 4 min.

 Filters:  IDAS LPS-V4 48mm
 Processing:  MSB Astroart 5.0
 Telescope:  8" Celestron EdgeHD
 Reducer:  None (f/10)

 Image CCD:  SX SXV-H9C 
 Guide CCD:  SX  MX7C
 Guide Scope:  Vixen ED80Sf

 Lower Image Details: 
 Scale: 571 x 426 light years   
 Date:  March 18, 2007
 Site:  Harahan, LA
 Conditions:  Clear, Dew
 Exposure:  CCD, 25 x 4 min.
 Filters:  IDAS LPS-P48
 Processing:  MSB Astroart 3.0
 Telescope:  4" Tak FSQ-106N
 Reducer:  None (f/5.0)
 Image CCD:  SX SXV-H9C
 Guide CCD:  SX  MX7C/SXV Int.
 Guide Scope:  Vixen ED80Sf

For more on globular clusters, see my M13 (Hercules) Globular Cluster page.