Monday, December 12, 2011

Open Cluster 12/11/11

The Double Cluster, NGC 869 and NGC 844.  Because the 14 is currently ALT-AZ mounted, exposures  have to be short due to field rotation.  This is a single, 30 second exposure--about the maximum before field rotation becomes a problem.  I'll also post an image of a stack, showing the field rotation of the star field.  The only real solution is to mount the scope on a wedge.  I will be mounting the 14 on an ultrawedge in the next week or so.