Messier 23 in Sagittarius
Messier 23 in Sagittarius
  • Description: M23 is a large, bright open cluster in Sagittarius. Measuring 27 arc minutes across makes it about the size of the full moon, 150 stars with a total magnitude of about 5.5. In other words, visible to the naked eye from good skies or with a pair of binoculars. Blue exposures cut short by the cluster descending into a cloud bank.
  • Camera: SBIG STF-8300M at -15C
  • Filter: Baader RGB
  • Scope: Takahashi FSQ-106N
  • Exposure: 3x10 minutes red, 3x10 green, 2x10 blue.
  • Location: 5th Meridian Observatory grounds, near Cayley AB.
  • Date: August 18, 2012
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