Object Type: Open cluster
The brightest stars in Collinder 399 form an asterism known as the Coathanger. On the night of September 2-3, 2011 Comet C/2009 P1 Garradd passed near the cluster.
Equipment:Nikkor 300mm/4 lens/ST-8300C/Paramount ME
Exposure: 20 minutes
Date: September 3, 2011
Location: Landers, California, USA
Technical Notes: Reduce Noise amd Gaussian Blur were applied to the dim portions of the image. The RGB image was duplicated to create a luminance layer. Another copy of the RGB image was combined with the original using Soft Light to increase color saturation.