56 Orionis

56 Orionis
Location of 56 Orionis (circled)
Observation data
Epoch J2000      Equinox ICRS
Constellation Orion
Right ascension 05h 52m 26.43865s
Declination +01° 51′ 18.5021″
Apparent magnitude (V) 4.76 (4.73 to 4.78)
Characteristics
Spectral type K2-IIb
U−B color index +1.46
B−V color index +1.382±0.005
Astrometry
Radial velocity (Rv)+11.27±0.14 km/s
Proper motion (μ) RA: –6.942 mas/yr
Dec.: –8.355 mas/yr
Parallax (π)2.8794±0.1854 mas
Distance1,130 ± 70 ly
(350 ± 20 pc)
Absolute magnitude (MV)−3.14
Details
Mass6.4±0.7 M☉
Radius92.21+4.27
−6.72 R☉
Luminosity2,547±187 L☉
Surface gravity (log g)0.91 cgs
Temperature4,270+165
−96 K
Metallicity [Fe/H]−0.07 dex
Rotational velocity (v sin i)3.5 km/s
Age60.7±18.4 Myr
Other designations
56 Ori, NSV 2690, BD+01°1151, FK5 2444, GC 7380, HD 39400, HIP 27750, HR 2037, SAO 113220, CCDM J05524+0151, WDS 05524+0151
Database references
SIMBADdata

56 Orionis is a single, variable star in the equatorial constellation of Orion. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.76. The star is located at a distance of approximately 1,130 light years from the Sun based on parallax. It is drifting further away with a radial velocity of +11 km/s. The star has a peculiar velocity of 19.0+2.9
−3.1 km/s relative to its neighbors, and may be a runaway star.

This object is a bright giant star with a stellar classification of K2-IIb. It is a suspected variable star of unknown type with a brightness that has been measured varying from 4.73 down to 4.78. The star is about 61 million years old with 6.4 times the mass of the Sun and is spinning with a projected rotational velocity of 3.5. Having exhausted the supply of hydrogen at its core, the star has expanded to 92 times the radius of the Sun. It is radiating 2,547 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,270 K.

It has one reported visual companion, designated component B, with magnitude 13.5 and angular separation 42.9″.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 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. S2CID 119257644. Vizier catalog entry
  3. 1 2 Samus, N. N.; Kazarovets, E. V.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 61 (1) (5.1 ed.): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869. Retrieved 2019-11-23.
  4. 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  5. ↑ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. 1 2 3 4 5 Tetzlaff, N.; et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  7. 1 2 Earle Luck, R. (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  8. 1 2 De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  9. ↑ "56 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-22.
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  11. ↑ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry