Xi Orionis information

ξ Orionis
	Location of ξ Orionis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Orion
Right ascension	06h 11m 56.39693s
Declination	+14° 12′ 31.5555″
Apparent magnitude (V)	4.47
Characteristics
Spectral type	B3 IV
U−B color index	−0.65
B−V color index	−0.19
Astrometry
Radial velocity (Rv)	+19.30 km/s
Proper motion (μ)	RA: +0.29 mas/yr ; Dec.: −20.12 mas/yr
Parallax (π)	5.37 ± 0.23 mas
Distance	610 ± 30 ly ; (186 ± 8 pc)
Orbit
Period (P)	45.1 d
Eccentricity (e)	0.26
Periastron epoch (T)	2,441,962.3 JD
Argument of periastron (ω); (secondary)	205°
Semi-amplitude (K1); (primary)	22.4 km/s
Details
ξ Ori A
Mass	6.7±0.1 M☉
Luminosity	1,390 L☉
Temperature	15,476 K
Rotational velocity (v sin i)	160 km/s
Age	32.1±4.3 Myr
Other designations
	ξ Ori, 70 Orionis, BD+14° 1187, HD 42560, HIP 29426, HR 2199, SAO 95362
Database references
SIMBAD	data

Xi Orionis (ξ Orionis) is a binary star system in the northeastern part of the constellation of Orion, well above the red giant star Betelgeuse in the sky. It lies next to another blue main-sequence star, Nu Orionis, which is somewhat closer at 520 light-years' distance. The apparent visual magnitude of Xi Orionis is 4.47,^[2] which is bright enough to be seen with the naked eye. The distance to this star, as determined using the parallax method, is roughly 610 light-years.^[1]

This is a spectroscopic binary star system with an orbital period of 45.1 days and an eccentricity of 0.26.^[5] The primary component is a B-type subgiant star with a stellar classification of B3 IV.^[3] With an estimated age of just 32 million years,^[3] it has a relatively high rate of spin, showing a projected rotational velocity of 160 km/s.^[7] Xi Orionis has about 6.7 times the mass of the Sun,^[3] and shines with 1,390 times the solar luminosity from its outer atmosphere at an effective temperature of 15,476 K.^[6]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Crawford1971 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference pourbaix2004 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[Crawford1971-2] Cite error: The named reference Crawford1971 was invoked but never defined (see the help page).

[Tetzlaff2011-3] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).

[deBruijne2012-4] Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).

[pourbaix2004-5] Cite error: The named reference pourbaix2004 was invoked but never defined (see the help page).

[Mcdonald2012-6] Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).

[Abt2002-7] Cite error: The named reference Abt2002 was invoked but never defined (see the help page).

[SIMBAD-8] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ξ Orionis (circled)
Constellation	Orion
Right ascension	06^h 11^m 56.39693^s^[1]
Declination	+14° 12′ 31.5555″^[1]
Apparent magnitude (V)	4.47^[2]
Characteristics
Spectral type	B3 IV^[3]
U−B color index	−0.65^[2]
B−V color index	−0.19^[2]
Astrometry

Radial velocity (R_v)	+19.30^[4] km/s
Proper motion (μ)	RA: +0.29^[1] mas/yr Dec.: −20.12^[1] mas/yr
Parallax (π)	5.37 ± 0.23 mas^[1]
Distance	610 ± 30 ly (186 ± 8 pc)

Orbit^[5]
Period (P)	45.1 d
Eccentricity (e)	0.26
Periastron epoch (T)	2,441,962.3 JD
Argument of periastron (ω) (secondary)	205°
Semi-amplitude (K₁) (primary)	22.4 km/s
Details
ξ Ori A
Mass	6.7±0.1^[3] `M`_☉
Luminosity	1,390^[6] `L`_☉
Temperature	15,476^[6] K
Rotational velocity (v sin i)	160^[7] km/s
Age	32.1±4.3^[3] Myr

Other designations
ξ Ori, 70 Orionis, BD+14° 1187, HD 42560, HIP 29426, HR 2199, SAO 95362^[8]
Database references
SIMBAD	data

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