Dimidium

51 Pegasi b, a large hot Jupiter exoplanet, approximately 50 light-years away from Earth in the constellation of Pegasus.

Proper noun

  1. 51 Pegasi b, a large hot Jupiter exoplanet, approximately 50 light-years away from Earth in the constellation of Pegasus.

Origin

Borrowed from Latin dīmidium (“half”), referring to the planet's mass of approximately half the mass of Jupiter.