Archive for December 3, 2018

12/03/2018 – Ephemeris – Comet Wirtanen should be bright enough for the naked eye or binoculars this month

December 3, 2018 Comments off

Ephemeris for Monday, December 3rd. The Sun will rise at 8:02. It’ll be up for 9 hours and 1 minute, setting at 5:03. The Moon, half way from last quarter to new, will rise at 4:56 tomorrow morning.

Beside Comet Machholz-Fujikawa-Iwamoto which I talked about last Thursday and should be at peak brightness about now in the western twilit sky, we have another comet, this one Comet 46P/Wirtanen is brightening in the east in the evening. Wirtanen is a member of the Jupiter family of comets, whose 5.44 year orbit of the Sun takes it from just outside the Earth’s orbit to just inside Jupiter’s orbit. This time around it will come as close as 7.1 million miles of the Earth. As of Thanksgiving the comet was 100 times brighter than its nominal expected brightness. I don’t know if it will stay that way. It has a history of outbursts. If it keeps it up Wirtanen could be as bright as the Pleiades stars when it passes them on the 16th.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Comet 46P/Wirtanen in December 2018

The path of Comet 46P/Wirtanen from November 21, 2018, to January 1, 2019. The labels are month, date, and expected magnitude. Click on the image to enlarge. Created using Cartes du Ciel (Sky Charts).

Check back every Wednesday at least where Comet Wirtanen will be past of the planet report.  I’ll be covering the comet on other days throughout the month.  Also check  Seiichi Yoshida’s Weekly Information about Bright Comets: