Procyon

Procyon
	; The position of Procyon
Observation data; Epoch J2000 Equinox J2000
Constellation	Canis Minor
Pronunciation	/ˈproʊsi.ɒn/ PROH-see-on
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 + DQZ
U−B color index	+0.00
B−V color index	+0.42
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 ± 1.26 mas
Distance	11.46 ± 0.05 ly ; (3.51 ± 0.02 pc)
Absolute magnitude (MV)	2.66/13.0
Details
Procyon A
Mass	1.478±0.012 M☉
Radius	2.043±0.009 R☉
Luminosity	7.049±0.064 L☉
Habitable zone inner limit	2.391 AU
Habitable zone outer limit	4.152 AU
Surface gravity (log g)	3.98±0.02 cgs
Temperature	6,582±5 K
Metallicity [Fe/H]	−0.02±0.02 dex
Rotation	23 days
Rotational velocity (v sin i)	3.16±0.50 km/s
Age	1.87±0.13 Gyr
Procyon B
Mass	0.592±0.006 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
Position (relative to Procyon A)
Component	Procyon B
Angular distance	maximum 5″
Orbit
Companion	Procyon 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, α Canis Minoris, 10 Canis Minoris, BD+05°1739, GJ 280, HD 61421, HIP 37279, HR 2943, SAO 115756, LHS 233
Database references
SIMBAD	The system
	A
	B

Procyon (/ˈproʊsi.ɒn/)^[17] 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,^[18] 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.

^ "Procyon". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference aaa413 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ApJ119_2 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Provencal2002 was invoked but never defined (see the help page).
^ ^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.
^ 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.
^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
^ ^a ^b ^c Cite error: The named reference Bond was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Soubiran2024 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aguirre was invoked but never defined (see the help page).
^ Cite error: The named reference mnras374_1_220 was invoked but never defined (see the help page).
^ Cite error: The named reference Liebert2013 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ApJS199_2_29 was invoked but never defined (see the help page).
^ von Littrow, Karl (1866). J. J. von Littrow's Atlas des gestirnten Himmels für Freunde der Astronomie (in German). Stuttgart: Gustav Weise. p. 9.
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ 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.
^ Cite error: The named reference GSM was invoked but never defined (see the help page).

[1] "Procyon". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[aaa474_2_653-2] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).

[aaa413-3] Cite error: The named reference aaa413 was invoked but never defined (see the help page).

[ApJ119_2-4] Cite error: The named reference ApJ119_2 was invoked but never defined (see the help page).

[Provencal2002-5] Cite error: The named reference Provencal2002 was invoked but never defined (see the help page).

[eggen-6] Mermilliod, J.-C (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.

[gcvs-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.

[rv-8] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.

[Bond-9] Cite error: The named reference Bond was invoked but never defined (see the help page).

[Soubiran2024-10] Cite error: The named reference Soubiran2024 was invoked but never defined (see the help page).

[aguirre-11] Cite error: The named reference aguirre was invoked but never defined (see the help page).

[mnras374_1_220-12] Cite error: The named reference mnras374_1_220 was invoked but never defined (see the help page).

[Liebert2013-13] Cite error: The named reference Liebert2013 was invoked but never defined (see the help page).

[ApJS199_2_29-14] Cite error: The named reference ApJS199_2_29 was invoked but never defined (see the help page).

[15] von Littrow, Karl (1866). J. J. von Littrow's Atlas des gestirnten Himmels für Freunde der Astronomie (in German). Stuttgart: Gustav Weise. p. 9.

[SIMBAD-16] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Kunitzsch-17] 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.

[GSM-18] Cite error: The named reference GSM was invoked but never defined (see the help page).

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[18]

Observation data Epoch J2000 Equinox J2000
The position of Procyon
Constellation	Canis Minor
Pronunciation	/ˈproʊsi.ɒn/ PROH-see-on^[1]
Right ascension	07^h 39^m 18.11950^s^[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 (R_v)	−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]
Distance	11.46 ± 0.05 ly (3.51 ± 0.02 pc)
Absolute magnitude (M_V)	2.66/13.0^[4]

Details
Procyon A
Mass	1.478±0.012^[9] `M`_☉
Radius	2.043±0.009^[10] `R`_☉
Luminosity	7.049±0.064^[10] `L`_☉
Habitable zone inner limit	2.391 AU^[11]
Habitable zone outer limit	4.152 AU^[11]
Surface gravity (log g)	3.98±0.02^[10] cgs
Temperature	6,582±5^[10] K
Metallicity [Fe/H]	−0.02±0.02^[10] dex
Rotation	23 days^[12]
Rotational velocity (v sin i)	3.16±0.50^[3] km/s
Age	1.87±0.13^[13] Gyr
Procyon B
Mass	0.592±0.006^[9] `M`_☉
Radius	0.01234±0.00032^[5] `R`_☉
Luminosity	0.00049^[14] `L`_☉
Surface gravity (log g)	8.0^[5] cgs
Temperature	7,740±50^[5] K
Age	1.37^[14] Gyr
Position (relative to Procyon A)

Component	Procyon B
Angular distance	maximum 5″
Orbit^[9]
Companion	Procyon 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^[15], α Canis Minoris, 10 Canis Minoris, BD+05°1739, GJ 280, HD 61421, HIP 37279, HR 2943, SAO 115756, LHS 233^[16]
Database references
SIMBAD	The system
	A
	B

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Procyon

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