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Comet Holmes on November 12th, 2007

On November 12th Comet Holmes had grown considerably, but had also dimmed. Nevertheless it was very obvious to the unaided eye. The dark zone in front of the coma could be seen through different instruments ranging from 15x60 to 30x80 binoculars and a 10-inch Dobsonian, so it seems that this is no artefact. A brownish or yellowish colour was only visible with small 10x40 binoculars - the colour seemed to vanish under a darker sky.

Comet Holmes taken at the prime focus of a 5-inch f/5.2 TeleVue refractor, 30 seconds at 800 ISO. Nikon D80, processed with Adobe Photoshop Elements. The image below is less strongly processed.

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