First light off-axis guider

First light off-axis guider

First light on the off-axis guider, 4 stars in M44

21-10-2013

First light on the off-axis guider

This image shows four stars in M44, at an exposure time of 10sec, limiting magnitude 14m at an pixel scale of 0.117 arcsec/pixel. The off-axis guider should rid us from the problems experienced with thermally induced changes in the alignment of the piggy-back auxiliary telescope and the main telescope, which rendered our differential pointing model inaccurate if the outside temperature changed by more than five degrees.