Procyon

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Related to Alpha Canis Minoris: Alpha Canis Majoris

Procyon

(prō`sēŏn'), brightest star in the constellation Canis MinorCanis Minor
[Lat.,=lesser dog], small constellation ying near the celestial equator, E of Orion and NE of Canis Major, the Large Dog. Known as the Small Dog, Canis Minor is traditionally identified as one of Orion's hunting dogs. It contains the bright star Procyon.
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; Bayer designation α Canis Minoris; 1992 position R.A. 7h38.9m, Dec.+5°15'. A yellow-white star of spectral classspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 F5 IV-V, it is one of the nearer bright stars, lying about 11.5 light-years away. Its name is from the Greek meaning "before the dog," i.e., before the Dog Star, SiriusSirius
, or Dog Star,
brightest star in the sky. It is located in the constellation Canis Major (1992 position R.A. 6h44.8m, Dec. −16°42'); its Bayer designation is Alpha Canis Majoris. Sirius [Gr.
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, the brightest star in the sky. Procyon is a brilliant star in its own right, its apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 of 0.35 making it one of the 10 brightest stars in the sky. It is a visual binary starbinary star
or binary system,
pair of stars that are held together by their mutual gravitational attraction and revolve about their common center of mass. In 1650 Riccioli made the first binary system discovery, that of the middle star in the Big Dipper's handle, Zeta
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.

Procyon

(proh -see-on) (α CMi) A conspicuous creamy-yellow star that is the brightest one in the constellation Canis Minor and is one of the nearest stars to the Sun. It was found to be a visual binary in 1840 from observations of its variable proper motion. The companion (B) was discovered in 1896 to be a white dwarf and is of magnitude 10.7. The period is 40.6 years, the separation 5″.2. mv : 0.4; Mv : 2.6; spectral type: F5 IV-V (A), DZ (B); mass: 1.74 (A), 0.63 (B) times solar mass; radius: 1.7 (A), 0.01 (B) times solar radius; distance: 3.5 pc.

Procyon

[′prō·sē‚än]
(astronomy)
A star of magnitude 0.3, of spectral type F5, and 11 light-years (1.04 × 1017 meters) from earth; one of a binary. Also known as α Canis Minoris.