Comet 2011 C1 McNaught. June 12, 2011.
Combination of 3, 3 minute images, SBIG STL-1001E CCD.
20" f/6.8 cassegrain at prime focus.
Yet another bright comet discovered by Rob McNaught at the Siding Sprinig Observatory in New South Wales, comet 2011 C1 McNaught reached 8th magnitude in April, 2011. When the image below was taken, the comet had faded to around 13th magnitude and fading quickly.