Procyon facts for kids
Procyon (α CMi, α Canis Minoris, Alpha Canis Minoris) is the brightest star in the constellation Canis Minor. To the naked eye, it appears to be a single star, the eighth brightest in the night sky with a visual apparent magnitude of 0.34.
The reason for its brightness is not its intrinsic luminosity but its relative closeness to the Sun. Its distance was worked out by the European Space Agency Hipparcos astrometry satellite. It is just 11.46 light-years (3.51 parsecs) away, and is one of our nearest stellar neighbours. Its closest neighbour is Luyten's Star, about 1.12 ly (0.34 pc) away.
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Procyon Facts for Kids. Kiddle Encyclopedia.