HD 115211

HD 115211
Observation data; Epoch J2000 Equinox J2000
Constellation	Musca
Right ascension	13h 17m 13.01064s[1]
Declination	−66° 47′ 00.3789″[1]
Apparent magnitude (V)	4.86[2]
Characteristics
Spectral type	K2 Ib-II[3]
B−V color index	1.480±0.004[2]
Variable type	Suspected[4]
Astrometry
Radial velocity (Rv)	−10.38±0.17[1] km/s
Proper motion (μ)	RA: −15.03±0.20[2] mas/yr ; Dec.: −6.63±0.17[2] mas/yr
Parallax (π)	2.3868 ± 0.1235[1] mas
Distance	1,370 ± 70 ly ; (420 ± 20 pc)
Absolute magnitude (MV)	−2.94[2]
Details
Mass	7.1±0.8[5] M☉
Radius	123.18+2.84; −8.96[1] R☉
Luminosity	3,849±234[1] L☉
Temperature	4,097+158; −47[1] K
Rotational velocity (v sin i)	2.5±1.2[6] km/s
Age	39.8±4.9[5] Myr
Other designations
	NSV 6164, CD−66° 1385, GC 17959, HD 115211, HIP 64820, HR 5002, SAO 252240[7]
Database references
SIMBAD	data

HD 115211 is a single[8] star in the southern constellation of Musca. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.86.[2] The distance to this star is approximately 1,370 light years based on parallax, and it is drifting closer to the Sun with a radial velocity of −10 km/s.[1] It has an absolute magnitude of −2.94.[2]

This is an aging bright giant/supergiant star with a stellar classification of K2 Ib-II.[3] It is a suspected variable star of unknown type, with a brightness that has been measured ranging from 4.83 down to 4.87.[4] HD 115211 is an estimated 40 million years old with 7.1 times the mass of the Sun.[5] With the supply of hydrogen exhausted at its core, it has expanded to 123 times the Sun's radius. It is radiating 3,849 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,097 K.[1]

References

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.
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.
Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085
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
De Medeiros, J. R.; et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
"HD 115211". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
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.

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[GaiaDR2-1] 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.

[Anderson2012-2] 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.

[Houk1979-3] Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.

[Samus2017-4] Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085

[Tetzlaff2011-5] 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

[DeMedeiros2002-6] De Medeiros, J. R.; et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.

[SIMBAD-7] "HD 115211". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.

[Eggleton2008-8] 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.