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Procyon

This article is about the star. For the genus of raccoons, see Procyon (genus). For other uses, see Procyon (disambiguation).

Procyon

The position of Procyon
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Pronunciation /ˈproʊsi.ɒn/ PROH-see-on[1]
Right ascension 07h 39m 18.11950s[2]
Declination +05° 13′ 29.9552″[2]
Apparent magnitude (V) 0.34[3] (A) / 10.7[4] (B)
Characteristics
Spectral type F5 IV–V[3] + DQZ[5]
U−B color index +0.00[6]
B−V color index +0.42[6]
Variable type suspected[7] (A)
Astrometry
Radial velocity (Rv)−3.2[8] km/s
Proper motion (μ) RA: −714.590[2] mas/yr
Dec.: −1036.80[2] mas/yr
Parallax (π)284.56 ± 1.26 mas[2]
Distance11.46 ± 0.05 ly
(3.51 ± 0.02 pc)
Absolute magnitude (MV)2.66/13.0[4]
Details
Procyon A
Mass1.499±0.031[9] M☉
Radius2.048±0.025[3] R☉
Luminosity6.93[3] L☉
Surface gravity (log g)3.96[3] cgs
Temperature6,530±50[3] K
Metallicity [Fe/H]−0.05±0.03[3] dex
Rotation23 days[10]
Rotational velocity (v sin i)3.16±0.50[3] km/s
Age1.87±0.13[9] Gyr
Procyon B
Mass0.602±0.015[5] M☉
Radius0.01234±0.00032[5] R☉
Luminosity0.00049[11] L☉
Surface gravity (log g)8.0[5] cgs
Temperature7,740±50[5] K
Age1.37[11] Gyr
Position (relative to Procyon A)
ComponentProcyon B
Angular distancemaximum 5″
Orbit[12]
CompanionProcyon B
Period (P)40.840 ± 0.022 yr
Semi-major axis (a)4.3075 ± 0.0016″
Eccentricity (e)0.39785 ± 0.00025
Inclination (i)31.408 ± 0.050°
Longitude of the node (Ω)100.683 ± 0.095°
Periastron epoch (T)1,968.076 ± 0.023
Argument of periastron (ω)
(secondary)		89.23 ± 0.11°
Other designations
Elgomaisa[13], α Canis Minoris, 10 Canis Minoris, BD+05°1739, GJ 280, HD 61421, HIP 37279, HR 2943, SAO 115756, LHS 233[14]
Database references
SIMBADThe system
A
B

Procyon (/ˈproʊsi.ɒn/)[15] is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with an apparent visual magnitude of 0.34.[3] It has the Bayer designation α Canis Minoris, which is Latinized to Alpha Canis Minoris, and abbreviated α CMi or Alpha CMi, respectively. As determined by the European Space Agency Hipparcos astrometry satellite,[16] this system lies at a distance of just 11.46 light-years (3.51 parsecs),[2] and is therefore one of Earth's nearest stellar neighbors.

A binary star system, Procyon consists of a white-hued main-sequence star of spectral type F5 IV–V, designated component A, in orbit with a faint white dwarf companion of spectral type DQZ,[5] named Procyon B. The pair orbit each other with a period of 40.84 years and an eccentricity of 0.4.

  1. ^ "Procyon". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  2. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference aaa413 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference ApJ119_2 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Provencal2002 was invoked but never defined (see the help page).
  6. ^ a b Mermilliod, J.-C (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  7. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.
  8. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  9. ^ a b Cite error: The named reference Liebert2013 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference mnras374_1_220 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference ApJS199_2_29 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ApJ2015 was invoked but never defined (see the help page).
  13. ^ von Littrow, Karl (1866). J. J. von Littrow's Atlas des gestirnten Himmels für Freunde der Astronomie (in German). Stuttgart: Gustav Weise. p. 9.
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  16. ^ Cite error: The named reference GSM was invoked but never defined (see the help page).

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