Taurids

Lore & Background

The Taurids are associated with Comet Encke and the asteroid 2004 TG10, which may be a large fragment of Encke due to similar orbital parameters. The stream is believed to be remnants of a disrupted 40-km-class comet from about 10,000 years ago, breaking into pieces via normal cometary activity, YORP spin-up, or close encounters with planetary tidal forces. This meteoroid stream is the largest in the inner Solar System, and Earth takes several weeks to pass through it, causing an extended period of activity.

The Taurids have two cross sections: the Southern Taurids (active September 23 to December 8) and the Northern Taurids (active October 13 to December 2). The daytime showers (Beta Taurids and Zeta Perseids) are active from May to July but cannot be visually observed. Astronomers Duncan Steel and Bill Napier suggest the Beta Taurids could be the cause of the Tunguska event of June 30, 1908.

The Taurid stream has a cycle of activity peaking roughly every 2,500 to 3,000 years, with the next peak expected around 3000 AD. In 1962 and 1963, the Mars 1 probe recorded micrometeorite strikes due to the Taurids at altitudes from 6,000 to 40,000 km from Earth's surface.

Reader's Guide

The Taurids are significant for their extended duration and slow, bright meteors, including occasional fireballs as bright as the Moon. In 1995, a Taurid bolide over Poland was estimated at 900 kg and perhaps a meter in diameter. Around Halloween in 2005, many fireballs were witnessed, leading to the nickname 'Halloween fireballs.' In 2013, fireball sightings were spotted over southern California, Arizona, Nevada, and Utah. A 2021 study catalogued 88 probable members of the Taurid swarm, showing cometary activity in groups such as 2212 Hephaistos and 169P/NEAT.

The Taurids also produced a lunar impact event recorded on November 7, 2005, likely the first photographic record of such a strike. The stream's legacy includes its role as the largest meteoroid stream in the inner Solar System, with material consisting of pebbles rather than dust grains. The Taurids' slow speed and weightier material make them distinct among annual showers, and their association with the Tunguska event adds to their historical interest.

Did You Know?

• The Taurids have the slowest impact speed of all well-known annual meteor showers.
• The Northern Taurids may originate from asteroid 2004 TG10, possibly a fragment of Comet Encke.
• A Taurid bolide over Poland in 1995 was estimated to be 900 kg and perhaps a meter in diameter.
• A lunar impact event on November 7, 2005, was likely caused by a Taurid meteor.