Procyon
 The position of Procyon |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Canis Minor |
| Pronunciation | /ˈproʊsi.ɒn/ |
| Right ascension | 07h 39m 18.11950s |
| Declination | +05° 13′ 29.9552″ |
| Apparent magnitude (V) | 0.34 (A) / 10.7 (B) |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F5 IV–V + DQZ |
| U−B color index | −0.01 |
| B−V color index | 0.40/0.0 |
| Variable type | suspected (A) |
| Astrometry | |
| Radial velocity (Rv) | −3.2 km/s |
| Proper motion (μ) |
RA: −714.590 mas/yr Dec.: −1036.80 mas/yr |
| Parallax (π) | 284.56 ± 1.26mas |
| Distance | 11.46 ± 0.05 ly (3.51 ± 0.02 pc) |
| Absolute magnitude (MV) | 2.66/13.0 |
| Details | |
| Procyon A | |
| Mass | 1.499±0.031 M☉ |
| Radius | 2.048±0.025 R☉ |
| Luminosity | 6.93 L☉ |
| Surface gravity (log g) | 3.96 cgs |
| Temperature | 6,530±50 K |
| Metallicity [Fe/H] | −0.05±0.03 dex |
| Rotation | 23 days |
| Rotational velocity (v sin i) | 3.16±0.50 km/s |
| Age | 1.87±0.13 Gyr |
| Procyon B | |
| Mass | 0.602±0.015 M☉ |
| Radius | 0.01234±0.00032 R☉ |
| Luminosity | 0.00049 L☉ |
| Surface gravity (log g) | 8.0 cgs |
| Temperature | 7,740±50 K |
| Age | 1.37 Gyr |
| Orbit | |
| Companion | Procyon B |
| Period (P) | 40.82 yr |
| Semi-major axis (a) | 4.3" |
| Eccentricity (e) | 0.407 |
| Inclination (i) | 31.1° |
| Longitude of the node (Ω) | 97.3° |
| Periastron epoch (T) | 1967.97 |
|
Argument of periastron (ω) (secondary) |
92.2° |
| Other designations | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Procyon (BrE /ˈproʊsi.ɒn/;PRO-see-on), also designated Alpha Canis Minoris (α Canis Minoris, abbreviated Alpha CMi, α CMi), is the brightest star in the constellation of 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. It is 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 DQZ, named Procyon B.
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 Earth's nearest stellar neighbours. Its closest neighboring star 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.
...
Wikipedia