Paul Walker
Registered: November 2009
Location: Middlebury, Vermont
Posts: 116
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Horsehead Nebula
Constellation - Orion
2009-11-17
Middlebury, VT
Exp 4x8min (32 min)
ISO 1600
North - left
Much easier object now that I have a modified camera and a light pollution filter.
10 inch f/5.6 (1407mm fl) Newtonian (Homemade with Coulter Optics)
Field of view: 0.90 x 0.60 deg.
Large Wooden Split Ring Equatorial Mount
Camera Canon Rebel XT (8 mega pixel)
with Orion Broadband Light Pollution Filter
Temperature - 21 degree F
Transparency 20.5 mag/arc sec (Sky Quality Meter)
Seeing 3 (1-10)
Off Axis guider info:
Optical axis 3 degree from main optics axis. Field available for guiding, approx 3 degree.
Autoguider (Meade Pictor 201XT)
Star - mag 6
Distance from optical center - 2 degrees
Exposure - 2sec
Brightness - 19 (0-99)
Error - 0-10 typical (Pixels ?)
Error - 20 max observed
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