Following the spectacular displays of the Geminids, the astronomical calendar reserves a final, quieter treat for skywatchers: the annual Ursid meteor shower. This December event, often overlooked due to its proximity to the winter holidays, offers a reliable, if modest, showing of ‘shooting stars’ that appear to radiate from the far northern sky.
The Ursids are currently active and building towards their peak, offering a unique opportunity for Northern Hemisphere observers to cap off the year with a late-night vigil under the winter sky. This year, viewing conditions are particularly favorable thanks to a nearly new moon, which ensures minimal light interference during the shower’s darkest hours.
Peak Performance: When to See Ursid Meteor Shower?
The Ursid meteor shower is active for a brief period in the latter half of December each year.
Key Dates and Times for Viewing
- Shower Activity Period: Roughly December 17 to December 26.
- Peak Night: The shower typically peaks on the night of December 21 into the morning of December 22, coinciding closely with the winter solstice.
- Best Viewing Time: The hours between midnight and dawn offer the best chance to spot the meteors, as the shower’s radiant climbs highest in the northern sky.
While the Ursids are generally considered a minor shower, often producing a steady but sparse rate of 5 to 10 meteors per hour under dark-sky conditions, they have a history of surprising observers. Rare, unexpected outbursts have been recorded, such as those in 1945 and 1986, which delivered intense rates approaching 90 to 120 meteors per hour, keeping a hopeful interest in this yearly event.
The Origins of the Ursids
Like all meteor showers, the Ursids are the result of Earth passing through a stream of debris left behind by a celestial object—in this case, a comet.
The parent body responsible for the Ursid stream is the periodic comet 8P/Tuttle. This medium-sized comet, first discovered in 1790, sheds ice and dusty particles as it follows its 13.5-year elliptical orbit around the Sun.
As these ‘comet crumbs,’ often no larger than grains of sand, slam into Earth’s atmosphere at high speed, they vaporize, creating the bright streaks of light we call ‘shooting stars.’
Locating the Radiant and Viewing Tips
The Ursids get their name because the meteors appear to streak outward from a point in the sky near the Little Dipper, which is an asterism within the constellation Ursa Minor (the Little Bear). This area of the sky is known as the radiant.
Due to the northerly location of this radiant, the Ursids are best viewed from the Northern Hemisphere.
Essential Tips for Spotting the Meteors
- Seek Darkness: The most crucial step is finding a viewing location far away from city light pollution, which can easily wash out the fainter streaks.
- Adjust Your Vision: Allow your eyes at least 20 to 30 minutes to fully adapt to the dark; even a quick glance at a smartphone screen can reset your night vision.
- Don’t Stare at the Radiant: While the meteors originate from Ursa Minor, they will have longer, more spectacular trails if you look about 30 degrees away from the Little Dipper, where they appear further down their path.
- Stay Warm: December nights are cold; observers should dress in multiple layers, bring a warm blanket, and use a reclining chair for comfort during the extended viewing period.
