Comet 17 / P Holmes

click to enlarge

to see a Polarization Image of this comet click here

Broadband image, click to enlarge, click here for highest resolution

Taken on October 24, 2007 from my backyard in Castro Valley, California

Stinger 450 Classical Cassegrain (18" f/12.6)  

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.1

(image scale = 0.42 arc-sec/pixel at capture)

Finger Lakes CM10 MaxCam imaging camera operated at -25C

Robofocus

Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

Custom Scientific 4.5nm FWHM Ha filter (50mm diameter)

1 exposures of 60 seconds through Halpha filter

1 minute  total exposure time