Castor

What this is

Castor is a fixed star the chart engine carries, at magnitude 1.98.

What it governs

The catalogue holds this star's position and its own motion, not a body of lore about it — a star's apparent place is its J2000 position carried forward and referred to the ecliptic of the date, exactly as a planet's is.

Correspondences

magnitude

1.98

right ascension

113.6494°

declination

31.8883°

proper motion

-206.33, -148.18 mas, yr