View from Mars Hill: The Annual Lyrid Meteor Shower Shows Its Things | Columnists


In less than two weeks, the annual Lyrid Meteor Shower will show its stuff. With an expected peak of 10-20 meteors per hour, it’s not as prolific as several of its sister showers but typically makes up for this with bling, showcasing some especially bright meteors called fireballs.

The Lyrids are so named because they appear to radiate from the constellation Lyra, the Harp. In reality, they have nothing to do with this pattern of stars but instead are linked to fragments of a comet that burn up as they speed through Earth’s atmosphere at some 110,000 miles per hour. Source

Each part of a comet’s name tells something about it. In the case of C/1861 G1 (Thatcher), the letter “C” means it is a long-period comet and 1861 indicates the year of discovery. The letter “G” refers to the first half of April and the number “1” means it was the first comet discovered in that specific half-month period of time. “Thatcher” is, of course, the discoverer.

American amateur astronomer A.E. Thatcher first reported this one in 1861, when it last reached its closest approach to the sun (perihelion) and came within about 31 million miles of Earth. By comparison, Venus’s average distance from Earth is 25 million miles. With a 415-year orbit, Comet C/1861 G1 (Thatcher) won’t visit the inner solar system again until the year 2276. This parent body, officially designated Comet C/1861 G1 (Thatcher), is a long-period comet. This is a category of comets whose members often exhibit highly inclined orbits in relation to the ecliptic (the sun’s apparent path across the sky). They take from hundreds to thousands of years to orbit.

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