M4

  
 
 
Home
New Images
Galleries
    Auroras
    Chrono Film
    Chrono DSLR
    Clusters
    Galaxies
    Nebulas
    Misc.
    Pool
Equipment
Links
Credits
 
   
 
  • RA: 16:23.6
  • Dec:  -26:32
  • Magnitude: 5.6
  • Size: 36.0 arc min
  • Distance: 7200 ly
  • Constellation:  Scorpius
  • Scope: 8" SCT at f/10
  • Autoguider: ST-4 faint mode
  • Sky conditions:  above average seeing and transparency.
  • Camera: Hutech modified Canon 300D, ISO800
  • Exposure: 15 X 2 minutes
  • Date:  July 5, 2008
 
 
Comments:  M4 is one of the nearest globular clusters in the sky.  It displays a central "bar" structure, that is visible in the photo.  M4 is one of the most open, or loose, globular clusters.  It was discovered b De Cheseaux in 1745-46.  In 1987 the first millisecond pulsar was discovered in this globular cluster.  This pulser, 1821-24, is a neutron star rotating once every 3.0 ms which is 10 times faster than the Crab pulsar in M1.