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Procyon
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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.
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Created By:
System
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