Nu Orionis

ν Orionis
Location of ν Orionis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Orion
Right ascension 06h 07m 34.32588s[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 (Rv)+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]
Distance520 ± 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
Mass6.7±0.1[4] M☉
Radius4.3[7] R☉
Luminosity1,965[3] L☉
Surface gravity (log g)4.06[8] cgs
Temperature17,880[8] K
Metallicity [Fe/H]−0.05[8] dex
Rotational velocity (v sin i)30[9] km/s
Age26.3±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
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Crawford1971 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Neuhaeuser2010 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference pourbaix2004 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Gies1992 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference MarettCrosby2013 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).