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31 Orionis

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31 Orionis
Location of 31 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 29m 43.98212s[1]
Declination −1° 05′ 32.0590″[1]
Apparent magnitude (V) 4.71[2]
Characteristics
Spectral type K5III[3]
U−B color index +1.91[4]
B−V color index +1.58[4]
Astrometry
Radial velocity (Rv)+7.50[5] km/s
Proper motion (μ) RA: +1.16[1] mas/yr
Dec.: -25.84[1] mas/yr
Parallax (π)6.42 ± 0.61 mas[1]
Distance510 ± 50 ly
(160 ± 10 pc)
Absolute magnitude (MV)-1.23[2]
Details
Luminosity1042[2] L☉
Surface gravity (log g)1.62[6] cgs
Temperature3,969[7] K
Metallicity [Fe/H]-0.21[2] dex
Rotational velocity (v sin i)2.7[8] km/s
Other designations
CI Ori, BD-01°913, CCDM J05297-0106A, GC 6792, HIP 25737, HR 1834, HD 36167, SAO 132176, WDS J05297-0106A
Database references
SIMBADdata

31 Orionis, or CI Orionis, is a class K5III[3] (orange giant) star in the constellation Orion. Its apparent magnitude is 4.71[2] and it is approximately 510 light years away based on parallax.[1] It is reported as a semi-regular variable with magnitude ranging from 4.68 to 4.72 over 141 days,[9] although the General Catalogue of Variable Stars describes this as unconfirmed by subsequent observations.[10]

It has one companion, B, a class F7V star of magnitude 10.2, at 12.7" separation.[11]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ a b Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.{{cite journal}}: CS1 maint: unflagged free DOI (link) Vizier catalog entry
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  9. ^ "CI Ori". The International Variable Star. AAVSO – American Association of Variable Star Observers. Retrieved 6 August 2016.
  10. ^ 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. Bibcode:2009yCat....1.2025S.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.{{cite journal}}: CS1 maint: unflagged free DOI (link) Vizier catalog entry
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