Nu Orionis information

ν Orionis
	Location of ν Orionis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Orion
Right ascension	06h 07m 34.32588s
Declination	+14° 46′ 06.5061″
Apparent magnitude (V)	4.42
Characteristics
Spectral type	B3 V or B3 IV
U−B color index	−0.67
B−V color index	−0.18
Astrometry
Radial velocity (Rv)	+24.1 km/s
Proper motion (μ)	RA: +6.78 mas/yr ; Dec.: −20.23 mas/yr
Parallax (π)	6.32 ± 0.33 mas
Distance	520 ± 30 ly ; (158 ± 8 pc)
Orbit
Period (P)	131.211 d
Eccentricity (e)	0.64
Periastron epoch (T)	2436475.852 JD
Argument of periastron (ω); (secondary)	6.6°
Semi-amplitude (K1); (primary)	33.3 km/s
Details
ν Ori A
Mass	6.7±0.1 M☉
Radius	4.3 R☉
Luminosity	1,965 L☉
Surface gravity (log g)	4.06 cgs
Temperature	17,880 K
Metallicity [Fe/H]	−0.05 dex
Rotational velocity (v sin i)	30 km/s
Age	26.3±5.3 Myr
Other designations
	ν Ori, 67 Orionis, BD+14° 1152, FK5 232, HD 41753, HIP 29038, HR 2159, SAO 95259.
Database references
SIMBAD	data

Nu Orionis (ν Orionis) is a binary star^[11] system in the northeastern part of the constellation Orion. It should not be confused with the variable star NU Orionis.^[12] Nu Orionis has an apparent visual magnitude of 4.42,^[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 0.00632 arcseconds,^[1] the distance to this system is roughly 520 light years.

This is a single-lined spectroscopic binary system,^[9] which means that only the absorption line features of one of the components can be distinguished. The components orbit each other with a period of 131.2 days and an eccentricity of 0.64.^[6] Depending on the source, the primary is either a B-type main sequence star with a stellar classification of B3 V,^[3] or a more evolved B-type subgiant star of class B3 IV.^[4] It has an angular diameter of 0.251 mas,^[13] which, at the estimated distance of this system, yields a physical size of about 4.3 times the radius of the Sun.^[7] The mass is 6.7^[4] times that of the Sun and it shines with 1,965^[3] times the solar luminosity from its outer atmosphere at an effective temperature of 17,880 K.^[8]

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^ Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).

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[tetzlaff2011-4] Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).

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

[pourbaix2004-6] Cite error: The named reference pourbaix2004 was invoked but never defined (see the help page).

[lang2006-7] Cite error: The named reference lang2006 was invoked but never defined (see the help page).

[Gies1992-8] Cite error: The named reference Gies1992 was invoked but never defined (see the help page).

[Abt2002-9] Cite error: The named reference Abt2002 was invoked but never defined (see the help page).

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

[Eggleton2008-11] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

[MarettCrosby2013-12] Cite error: The named reference MarettCrosby2013 was invoked but never defined (see the help page).

[Zorec2009-13] Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ν Orionis (circled)
Constellation	Orion
Right ascension	06^h 07^m 34.32588^s^[1]
Declination	+14° 46′ 06.5061″^[1]
Apparent magnitude (V)	4.42^[2]
Characteristics
Spectral type	B3 V^[3] or B3 IV^[4]
U−B color index	−0.67^[2]
B−V color index	−0.18^[2]
Astrometry

Radial velocity (R_v)	+24.1^[5] km/s
Proper motion (μ)	RA: +6.78^[1] mas/yr Dec.: −20.23^[1] mas/yr
Parallax (π)	6.32 ± 0.33 mas^[1]
Distance	520 ± 30 ly (158 ± 8 pc)

Orbit^[6]
Period (P)	131.211 d
Eccentricity (e)	0.64
Periastron epoch (T)	2436475.852 JD
Argument of periastron (ω) (secondary)	6.6°
Semi-amplitude (K₁) (primary)	33.3 km/s
Details
ν Ori A
Mass	6.7±0.1^[4] `M`_☉
Radius	4.3^[7] `R`_☉
Luminosity	1,965^[3] `L`_☉
Surface gravity (log g)	4.06^[8] cgs
Temperature	17,880^[8] K
Metallicity [Fe/H]	−0.05^[8] dex
Rotational velocity (v sin i)	30^[9] km/s
Age	26.3±5.3^[4] Myr

Other designations
ν Ori, 67 Orionis, BD+14° 1152, FK5 232, HD 41753, HIP 29038, HR 2159, SAO 95259.^[10]
Database references
SIMBAD	data

Nu Orionis information

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