Astronomical phenomenon _ quadrant meteor shower

The quadrant meteor shower is a relatively large meteor shower, which occurs at the beginning of each year. Quadrant is an ancient constellation, but there is no such constellation in the division of modern constellations. Its position is roughly between Shepherd and Dragon, the declination can reach about 50 N, the meteor shower speed is moderate and the brightness is high, so it is not difficult to distinguish the meteors in the quadrant group, and their colors are mostly red.

cause

Quadrant meteor shower is an abandoned constellation. The original name of meteor shower is "Draco Meteor Shower", and its radiant point was originally located in Draco, but now it has been moved to Pisces. The quadrant meteor shower, a traditional meteor shower with a large flow, is the strangest one for astronomers and astronomy enthusiasts, and even its parent comet is still a mystery until now. One view is that the mother comets of the quadrant meteor shower are C//KOOC-0/490Y/KOOC-0/and C//KOOC-0/385U/KOOC-0/,but some scientists think that it was brought by the asteroid 2003EH/KOOC-0/. This meteor shower may be formed by the debris in orbit after the earth passed through the asteroid 2003EH 1 (originally a comet, the loose material was blown away by the sun, and the remaining comet nucleus became an asteroid).

The origin of the name

Quadrant meteor shower is a major meteor shower. In order to avoid confusion with another major meteor shower in 10, it was named after an abandoned constellation, and it was also the only meteor shower named after a nonexistent constellation in the International Astronomical Union. Most of the older astronomical books and periodicals in China use their original names. At present, some China publications still refer to this meteor shower as "Draco meteor shower".