M12 - Globular Star Cluster in Ophiuchus


Copyright 2009 Hap Griffin

M12 is a globular star custer lying in the constellation of Ophiuchus.  It lies in the halo of globular clusters surrounding the core of our Milky Way galaxy at a distance of some 16,000 light years.  Visible just below it at the 5 o'clock position is distant magnitude 15.8 galaxy PGC 1103219.  It appears as a faint reddish smear.


Date/Location:    January 31, 2009     Griffin/Hunter Observatory    Bethune, SC
Instrument:    10" Orion Newtonian with Baader MPCC 
Focal Ratio:   f/4.7
Camera:    Modified Canon 40D
Guiding:    Auto via SBIG ST-402 through Takahashi FSQ-106N
Mount:    AP1200GTO
Conditions:    Visually clear and cold - some sky glow
Weather:    28 F
Exposure: 39 minutes total (13 x 3 minutes) @ ISO 800
Filters:    Baader UV/IR block internal to camera
Processing:    Focused and captured with ImagesPlus Camera Control v 3.50a.  RAW to TIFF conversion, dark and flat frame calibration, Digital Development in ImagesPlus v3.50a.  FInal tweaking in Photoshop CS3.