Comet Wirtanen/46P on December 5, 2018

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    Comet Wirtanen/46P in a telescopic closeup on December 5, 2018, taken from home in Alberta. The field of view is about 3° x 2° so the comet coma is certainly half a degree across (about 45 arc minutes) and appears visually as a large diffuse glow. There’s no sign of an ion tail in this set of exposures – it might be lost amid the bright coma.

    This is a stack of 4 x 4-minute exposures with the 105mm A&M apo refractor at f/6.2 guided and aligned on the stars, and a set of 4 exposures for the core aligned on the comet and masked in to add just the core with a minimum of trailing. Though even in four minutes the comet moved enough to trail noticeably at this focal length, an issue with all close approaching coments.

    All with the Canon 6D MkII at ISO 1600.

    Pétur Jónsson, Toolman2012, and 32 other people added this photo to their favorites.

    1. nightscapades 3 months ago | reply

      This is a beautiful and wonderfully sharp image, Alan. I've had your eBook for a few years and heard you talking about 46P on the "PhotogAdventures" podcast this week. Keep up the great work of inspiring us all,

    2. Amazing Sky Photography 3 months ago | reply

      Doug Ingram Thanks Doug! It was fun chatting with Aaron for more than an hour! We did go on! Glad you liked it.

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