When meteor enthusiasts think of the month of December, they immediately conjure up visions of the Geminids. Over the years, these have evolved into the most reliable of the dozen or so annual meteor displays.
But this year, a nearly full moon almost wrecked the Geminids by lighting up the sky and squelching all but the brightest meteor streaks.
However, as a "consolation prize," there is another December meteor show that hardly gets any notice at all: the Ursids.
Related: Ursid Meteor Shower 2019: When, Where & How to See It
This year, the peak of this meteor display is due during the overnight hours of Sunday (Dec. 22), into the morning hours of Monday (Dec. 23).
The Ursids (sometimes also referred to as the Umids) are so named because they appear to fan out from the vicinity of the bright orange star Kochab in the constellation of Ursa Minor, the little bear. Kochab is the brighter of the two outer stars in the bowl of the Little Dipper (the other being Pherkad) that seem to march in a circle like sentries around Polaris, the North Star.
While the moon "muscled in" on the peak of the Geminids near full phase last week, the natural satellite will have shrunk to a thin, waning crescent phase when the Ursids reach their peak. And even after the moon rises at around 4:30 a.m. local time on Monday, it won't create much of a hindrance to meteor watching.
This is a fortunate circumstance, because the Ursids are an often neglected meteor shower. That's because the meteor shower almost always coincide with the winter solstice, which means skywatchers must brave cold temperatures to see the display. And while the Geminids typically produce prolific numbers of bright meteors during the course of a single hour, the usual Ursid rate is considerably less, bringing only about a dozen or so moderately bright meteors per hour at the shower's peak. These meteors, or "shooting stars," are actually the dusty material shed by Comet 8P/Tuttle, which orbits the sun once every 13.6 years and is not due to return until August 2021.
Ursid meteors will appear to radiate from a position in the sky above the Little Dipper (Ursa Minor) near Polaris, but the meteors can appear anywhere in the sky. (Image credit: Starry Night)
Then again, you might want to periodically check the sky on Sunday night, just in case the "Little Bear's meteor shower" decides to come out of winter hibernation.
How Meteor Showers Work (Infographic) See Earth Fly Through Meteor Showers' Wandering, Warped Paths (Animation)Geminid Meteor Shower's Parent Debris Trail Spotted for 1st Time (Photo)Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy for Natural History magazine, the Farmers' Almanac and other publications. Follow us on Twitter @Spacedotcom and on Facebook.
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