Author: Bob King / Source: Sky & Telescope
Learn how chase away the Moon to keep Comet 46P/Wirtanen in a dark sky. Here’s an update on the comet’s progress and what to look for in the coming nights.
Big, bright Moons are comet killers. Those of you seeking Comet 46P/Wirtanen, now a naked-eye sight from rural areas, have probably noticed the waxing Moon creeping up in the comet’s direction the past few nights.
Some comets are compact and bright and do OK in moonlight, but 46P is large and diffuse and best seen in a dark sky.
Stellarium with additions by the author
I’ve prepared a fresh map to help you follow our fuzzy friend through Christmas and a list showing when the comet will be visible in a dark, moonless sky. These times will vary somewhat depending on your location, so use them as guidelines. Check the moonrise and moonset calculator to find out exactly when the Moon sets where you live. As it gains on the comet each night, you’ll need to stay up later and later for moonset and dark skies.
Bob King
The best times to see 46P/Wirtanen under moonless skies:
- Friday, December 14th — Moon at first quarter phase and sets 11:30 to midnight. Some light but still not a comet-quencher.
- Saturday, December 15th — Moon sets 12:30–1 a.m. Sunday morning.
- Sunday, December 16th — Moon sets 1:30–2 a.m. Monday…
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