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Procyon

Procyon A/B The position of Procyon Observation data Epoch J2000      Equinox J2000 Constellation Canis Minor Pronunciation pron.: /'pro?si.?n/ Right ascension 07h 39m 18.11950s Declination +05° 13' 29.9552? Apparent magnitude (V) 0.34 (A) / 10.7 (B) Characteristics Spectral type F5 IV–V/DA U-B color index -0.01 B-V color index 0.40/0.0 Astrometry Radial velocity (Rv) -3.2 km/s Proper motion (µ) RA: -714.590 mas/yr Dec.: -1036.80 mas/yr Parallax (p) 284.56 ± 1.26 mas Distance 11.46 ± 0.05 ly (3.51 ± 0.02 pc) Absolute magnitude (MV) 2.65/13.04 Details Procyon A Mass 1.42 ± 0.04 M? Radius 2.048 ± 0.025 R? Luminosity 6.93 L? Surface gravity (log g) 3.96 Temperature 6,530 ± 50 K Metallicity -0.05 ± 0.03 dex Rotation 23 days Rotational velocity (v sin i) 3.16 ± 0.50 km/s Age 3 Gyr Procyon B Mass 0.602 ± 0.015 M? Radius 0.01234 ± 0.00032 R? Luminosity 0.00055 L? Surface gravity (log g) 8.0 Temperature 7,740 ± 50 K Orbit Companion Procyon B Period (P) 40.82 yr Semimajor axis (a) 4.3" Eccentricity (e) 0.407 Inclination (i) 31.1° Longitude of the node (O) 97.3° Periastron epoch (T) 1967.97 Argument of periastron (?) (secondary) 92.2° Other designations Database references SIMBAD data Procyon (a CMi, a 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 seventh brightest in the night sky with a visual apparent magnitude of 0.34. It is actually a binary star system, consisting of a white main-sequence star of spectral type F5 IV–V, named Procyon A, and a faint white dwarf companion of spectral type DA, named Procyon B. The reason for its brightness is not its intrinsic luminosity but its closeness to the Sun; as determined by the European Space Agency Hipparcos astrometry satellite, it lies at a distance of just 11.46 light-years (3.51 parsecs), and is therefore one of our nearest stellar neighbours. Its closest neighbour is Luyten's Star, about 1.12 ly (0.34 pc) away, and the latter would appear as a visual magnitude 2.7 star in the night sky of a hypothetical planet orbiting Procyon. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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