HD 125072

HD 125072 is a star in the southern constellation of Centaurus. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.637.[2] The star is located at a distance of 38.6 light years from the Sun based on parallax.[1] It is drifting closer with a radial velocity of −14.9 km/s.[5] The components of the space velocity for this star are U=−18.5, V=−6.9 and W=−26.9 km/s.[7]

HD 125072
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 14h 19m 04.83414s[1]
Declination −59° 22′ 44.5272″[1]
Apparent magnitude (V) 6.637[2]
Characteristics
Spectral type K3 IV[3]
U−B color index +0.905[4]
B−V color index +1.025[4]
Astrometry
Radial velocity (Rv)−14.9[5] km/s
Proper motion (μ) RA: −454.895[1] mas/yr
Dec.: −810.729[1] mas/yr
Parallax (π)84.4535 ± 0.0349 mas[1]
Distance38.62 ± 0.02 ly
(11.841 ± 0.005 pc)
Absolute magnitude (MV)6.28[2]
Details
Mass0.806±0.017[6] M☉
Radius0.83+0.02
−0.01[1] R☉
Luminosity0.347±0.001[1] L☉
Surface gravity (log g)4.48[3] cgs
Temperature4,858+47
−59[1] K
Metallicity [Fe/H]−0.70[7] dex
Rotational velocity (v sin i)3.97[8] km/s
Age9.98[7] Gyr
Other designations
CD−58°5564, GJ 542, HD 125072, HIP 69972, SAO 241627, LHS 2892, LTT 5625[9]
Database references
SIMBADdata

The stellar classification of this star is K3 IV,[3] matching a K-type subgiant that is evolving into a giant. It has 81%[6] of the Sun's mass and 83%[1] of the radius of the Sun. The star is radiating 34.7% of the Sun's luminosity from its photosphere at an effective temperature of 4,858 K.[1] Based on the composition and kinematics of this star, it has an estimated age of about 10 billion years.[7] It is spinning with a projected rotational velocity of 4 km/s.[8]

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. Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511
  3. Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  5. Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E
  6. Tsantaki, M.; et al. (July 2013), "Deriving precise parameters for cool solar-type stars. Optimizing the iron line list", Astronomy & Astrophysics, 555: A150, arXiv:1304.6639, Bibcode:2013A&A...555A.150T, doi:10.1051/0004-6361/201321103, S2CID 118388752.
  7. Lachaume, R.; et al. (1999). "Age determinations of main-sequence stars: combining different methods". Astronomy and Astrophysics. 348: 897–909. Bibcode:1999A&A...348..897L.
  8. Martínez-Arnáiz, R.; et al. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF). Astronomy and Astrophysics. 520: A79. arXiv:1002.4391. Bibcode:2010A&A...520A..79M. doi:10.1051/0004-6361/200913725. S2CID 43455849. Archived from the original (PDF) on 2017-09-22. Retrieved 2018-11-04.
  9. "HD 125072". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-08.
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