astroimages
Darin E. Fields' Astrophotography Pages
 

NGC 6642: Globular Cluster in Sagittarius

Right Ascension18h 31m 56s
Declination-23° 28' 31"
Visual Brightness8.8 (mag) 
Apparent Dimension4.5 (arc min)
More information on NGC 6642
 
 
 

144 second (12 x 12 sec.) exposure using the PC camera with Dave Allmon's QCV2 software on the 8" Newtonian.

This bright core on this small globular located just over 1 degree NW of M22 makes capturing the surrounding stars a challenge.  Tracking wasn't as precise as I would have liked either.   Its defintely worth a second try.

Dark frame processing, image alignment, and stacking was done with Dave Allmon's DarkGen program.  Final processing performed with Photoshop.
9/22/2000

This image was cropped from the raw, stacked frame above prior to processing.  It was then processed separately.