周しゅう期き彗すい星せい

noun

periodic comet

A comet with a known orbital period, such as Halley's Comet. Used in astronomy.

• ハレー彗すい星せいは有ゆう名めいな周しゅう期き彗すい星せいです。

  Halley's Comet is a famous periodic comet.