アステリズム

noun

asterism

Refers to a recognizable pattern of stars that is not an official constellation, such as the Big Dipper or the Summer Triangle.

• 北ほく斗と七しち星せいは、おおぐま座ざの一いち部ぶをなすアステリズムです。

  The Big Dipper is an asterism that forms part of the constellation Ursa Major.