74 Orionis

This article is about k Orionis. Not to be confused with κ Orionis.

74 Orionis is a single^[10] star in the equatorial constellation of Orion. It has the Bayer designation k Orionis, while 74 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-white hued point of light with an apparent visual magnitude of 5.04.^[2] It is located at a distance of 64 light years from the Sun based on parallax,^[1] and is drifting further away with a radial velocity of +9 km/s.^[5] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.204 arc seconds per annum.^[11]

74 Orionis

Observation data Epoch J2000      Equinox J2000
Constellation	Orion
Right ascension	06h 16m 26.61878s[1]
Declination	12° 16′ 19.7909″[1]
Apparent magnitude (V)	5.04[2]
Characteristics
Evolutionary stage	main sequence
Spectral type	F5V[3]
U−B color index	-0.02[4]
B−V color index	+0.42[4]
Astrometry
Radial velocity (Rv)	+9.17[5] km/s
Proper motion (μ)	RA: +83.102[1] mas/yr Dec.: +186.263[1] mas/yr
Parallax (π)	51.1930 ± 0.1907 mas[1]
Distance	63.7 ± 0.2 ly (19.53 ± 0.07 pc)
Absolute magnitude (MV)	3.62[2]
Details
Mass	1.39[6] M☉
Radius	1.3[7] R☉
Luminosity	3.02[2] L☉
Surface gravity (log g)	4.34[6] cgs
Temperature	6,595[6] K
Metallicity [Fe/H]	-0.03[2] dex
Rotational velocity (v sin i)	18.8[8] km/s
Age	2.316[6] Gyr
Other designations
k Ori, 74 Ori, BD+12°1084, FK5 1169, GC 8033, GJ 9207, HD 43386, HIP 29800, HR 2241, SAO 95476, CCDM J06165+1216A, WDS J06164+1216A, LTT 11823[9]
Database references
SIMBAD	data

This object is an ordinary F-type main-sequence star with a stellar classification of F5V.^[3] It is an estimated 2.3^[6] billion years old and is spinning with a projected rotational velocity of 18.8 km/s.^[8] The star has 1.4^[6] times the mass of the Sun and 1.3^[7] times the Sun's radius. Metallicity is near solar,^[2] which indicates it has a Sun-like abundances of elements. The star is radiating three^[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,595 K.^[6]

74 Orionis has two visual companions: component B, with magnitude 12.5 and separation 32.1", and C, with magnitude 9.0 and separation 195.5".^[12]

References

1. 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. 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. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
4. 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
5. Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. (2010). "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups". Astronomy and Astrophysics. 521: A12. arXiv:1007.1132. Bibcode:2010A&A...521A..12M. doi:10.1051/0004-6361/201014948. S2CID 119209183.
6. David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607. Vizier catalog entry
7. Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
8. 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. "74 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-08.
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. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
12. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (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