23 Orionis

23 Orionis
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 22m 50.00474s[1]
Declination +03° 32′ 39.9770″[1]
Apparent magnitude (V) 4.99[2] (4.95 + 6.76)[3]
Characteristics
Evolutionary stage main sequence
Spectral type B1V + B3V[4]
B−V color index −0.096±0.004[2]
Astrometry
Absolute magnitude (MV)−2.93[2]
23 Ori A
Radial velocity (Rv)+18.0±3.7[5] km/s
Proper motion (μ) RA: −2.414[1] mas/yr
Dec.: +1.230[1] mas/yr
Parallax (π)2.7199 ± 0.3155 mas[1]
Distanceapprox. 1,200 ly
(approx. 370 pc)
23 Ori B
Radial velocity (Rv)28[6] km/s
Proper motion (μ) RA: +1.275[7] mas/yr
Dec.: −0.552[7] mas/yr
Parallax (π)2.5579 ± 0.0864 mas[7]
Distance1,280 ± 40 ly
(390 ± 10 pc)
Details
23 Ori A
Mass12.5±0.6[8] M☉
Radius6.97[9] R☉
Luminosity26,546[10] L☉
Surface gravity (log g)4.078±0.045[11] cgs
Temperature25,400[10] K
Rotational velocity (v sin i)350[4] km/s
Age15.4±0.6[8] Myr
23 Ori B
Mass6.6±0.1[8] M☉
Radius4.71[9] R☉
Luminosity1,620[10] L☉
Temperature18,700[10] K
Rotational velocity (v sin i)370[4] km/s
Age22.8±2.3[8] Myr
Other designations
23 Ori, SAO 112697, WDS J05228+0333[12]
A: BD+03°871, HD 35149, HIP 25142, HR 1770, SAO 112697
B: BD+03°872, HD 35148, HIP 25145, SAO 112699
Database references
SIMBADdata
B

23 Orionis is a double star located around 1,200 light-years (370 parsecs)[1] away from the Sun in the equatorial constellation of Orion.[12] It is visible to the naked eye as a dim, blue-white-hued point of light with a combined apparent visual magnitude of 4.99.[2] The pair are moving away from the Earth with a heliocentric radial velocity of +18 km/s,[5] and they are members of the Orion OB1 association, subgroup 1a.[13]

Howe and Clarke (2009) catalog this as a double-lined spectroscopic binary star system[14] with a wide projected separation of 9,460 AU.[9] As of 2018, they had an angular separation of 31.9″ along a position angle of 30°.[3] The brighter member, component A, is a B-type main-sequence star with a stellar classification of B1V. The secondary, component B, is of class B3V.[4] Both stars are spinning rapidly.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference levato1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference morrell was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference GaiaDR2b was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Howe2009 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Huang2010 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Welty1999 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference chini2012 was invoked but never defined (see the help page).