Kappa Mensae

κ Mensae
	Location of κ Mensae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Mensa
Right ascension	05h 50m 16.7857s[1]
Declination	−79° 21′ 40.8999″[1]
Apparent magnitude (V)	5.451 ± 0.009[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	B9 V[4]
U−B color index	−0.24[5]
B−V color index	−0.08[5]
Astrometry
Radial velocity (Rv)	9.5 ± 2[6] km/s
Proper motion (μ)	RA: −4.815[1] mas/yr ; Dec.: +66.518[1] mas/yr
Parallax (π)	11.018 ± 0.0604 mas[1]
Distance	296 ± 2 ly ; (90.8 ± 0.5 pc)
Absolute magnitude (MV)	+0.78[7]
Details
Mass	3.44[8] M☉
Luminosity	66.4+2.6; −2.5[3] L☉
Surface gravity (log g)	4.21[8] cgs
Temperature	10,965±50[3] K
Rotational velocity (v sin i)	290[9] km/s
Age	115[8] Myr
Other designations
	κ Mensae, 32 G. Mensae, CPD−79° 202, HD 40953, HIP 27566, HR 2125, SAO 256248
Database references
SIMBAD	data

Kappa Mensae, Latinized from κ Mensae, is a solitary star in the southern circumpolar constellation Mensa. Its distance of 296 light years[1] based on its parallax shift gives it an apparent magnitude of 5.45,[2] making it faintly visible to the naked eye. However, it is receding from the Sun at a heliocentric radial velocity of 9.5 km/s.[6]

Kappa Mensae has a stellar classification of B9 V,[4] indicating that it is an ordinary B-type main-sequence star that is still generating energy from hydrogen fusion at its core. At present it has 3.44 times the mass of the Sun[8] and shines at 66[3] times the luminosity from its photosphere at an effective temperature of 10,965 K,[3] which gives it a bluish-white hue. The star is very young at an age of 115 million years[8] and has a high rate of spin, rotating with a projected rotational velocity of 290 km/s.[9]

References

Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union. 30: 57. Bibcode:1967IAUS...30...57E.
Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
David, Trevor J.; Hillenbrand, Lynne A. (12 May 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. ISSN 1538-4357.
Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific. 215: 51. Bibcode:2004IAUS..215...51L.

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[GaiaEDR3-1] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.

[Tycho2000-2] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Zorec2012-3] Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.

[Houk1975-4] Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.

[Johnson1966-5] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[Evans1967-6] Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union. 30: 57. Bibcode:1967IAUS...30...57E.

[XHIP-7] Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.

[David2015-8] David, Trevor J.; Hillenbrand, Lynne A. (12 May 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. ISSN 1538-4357.

[Levato2004-9] Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific. 215: 51. Bibcode:2004IAUS..215...51L.