# HD 125442

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Star in the constellation Lupus

HD 125442 Location of HD 125442 (circled in red) Observation data Epoch J2000 Equinox J2000 Constellation Lupus[1] Right ascension 14h 20m 42.58071s[2] Declination −45° 11′ 13.4190″[2] Apparent magnitude (V) 4.78[1] Characteristics Spectral type F0 IV[3] B−V color index 0.310±0.003[1] Astrometry Radial velocity (Rv) +0.0±3.7[4] km/s Proper motion (μ) RA: +37.33[5] mas/yr Dec.: −72.81[5] mas/yr Parallax (π) 22.1448±0.3265 mas[2] Distance 147 ± 2 ly (45.2 ± 0.7 pc) Absolute magnitude (MV) 1.49[6] Details Mass 1.58[7] M☉ Radius 2.95[7] R☉ Luminosity 20.2[7] L☉ Surface gravity (log g) 3.97[7] cgs Temperature 7,123[7] K Rotational velocity (v sin i) 148±10[6] km/s Age 614[8] Myr Other designations CD−44°9236, HD 125442, HIP 70104, HR 5364, SAO 224843[9] Database references SIMBAD data

**HD 125442** is a single[10] [star](/source/Star) in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). Its [apparent visual magnitude](/source/Apparent_visual_magnitude) is 4.78,[1] which can be seen with the naked eye. The distance to HD 125442, as determined from its annual [parallax shift](/source/Stellar_parallax) of 22.1 [mas](/source/Milliarcsecond),[2] is 147 [light years](/source/Light_year).

This is an [F-type](/source/F-type_star) [subgiant star](/source/Subgiant_star) with a [stellar classification](/source/Stellar_classification) of F0 IV,[3] having, at the age of 614 million years,[8] used up the hydrogen at its core and begun the process of [evolving](/source/Stellar_evolution) into a [giant star](/source/Giant_star). It has 1.6 times the [mass of the Sun](/source/Mass_of_the_Sun) and is radiating 20 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 7,123 [K](/source/Kelvin).[7] The star displays a high rate of spin with a [projected rotational velocity](/source/Projected_rotational_velocity) of 148 km/s.[6]

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) [***c***](#cite_ref-Anderson2012_1-2) [***d***](#cite_ref-Anderson2012_1-3) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=70104&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR2_2-0) [***b***](#cite_ref-GaiaDR2_2-1) [***c***](#cite_ref-GaiaDR2_2-2) [***d***](#cite_ref-GaiaDR2_2-3) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051).

1. ^ [***a***](#cite_ref-houk1978_3-0) [***b***](#cite_ref-houk1978_3-1) Houk, Nancy (1978), *Michigan catalogue of two-dimensional spectral types for the HD stars*, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1978mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1978mcts.book.....H).

1. **[^](#cite_ref-deBruijne2012_4-0)** de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", *Astronomy & Astrophysics*, **546**: 14, [arXiv](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-vanLeeuwen2007_5-0) [***b***](#cite_ref-vanLeeuwen2007_5-1) van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-vonEiff2012_6-0) [***b***](#cite_ref-vonEiff2012_6-1) [***c***](#cite_ref-vonEiff2012_6-2) Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", *Astronomy & Astrophysics*, **542**: A116, [arXiv](/source/ArXiv_(identifier)):[1204.2459](https://arxiv.org/abs/1204.2459), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...542A.116A](https://ui.adsabs.harvard.edu/abs/2012A&A...542A.116A), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201118724](https://doi.org/10.1051%2F0004-6361%2F201118724), [S2CID](/source/S2CID_(identifier)) [53666672](https://api.semanticscholar.org/CorpusID:53666672).

1. ^ [***a***](#cite_ref-tic_7-0) [***b***](#cite_ref-tic_7-1) [***c***](#cite_ref-tic_7-2) [***d***](#cite_ref-tic_7-3) [***e***](#cite_ref-tic_7-4) [***f***](#cite_ref-tic_7-5) Stassun, Keivan G.; et al. (2019). ["The Revised TESS Input Catalog and Candidate Target List"](https://doi.org/10.3847%2F1538-3881%2Fab3467). *The Astronomical Journal*. **158** (4): 138. [arXiv](/source/ArXiv_(identifier)):[1905.10694](https://arxiv.org/abs/1905.10694). [Bibcode](/source/Bibcode_(identifier)):[2019AJ....158..138S](https://ui.adsabs.harvard.edu/abs/2019AJ....158..138S). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab3467](https://doi.org/10.3847%2F1538-3881%2Fab3467).

1. ^ [***a***](#cite_ref-David2015_8-0) [***b***](#cite_ref-David2015_8-1) 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](/source/ArXiv_(identifier)):[1501.03154](https://arxiv.org/abs/1501.03154), [Bibcode](/source/Bibcode_(identifier)):[2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/804/2/146](https://doi.org/10.1088%2F0004-637X%2F804%2F2%2F146), [S2CID](/source/S2CID_(identifier)) [33401607](https://api.semanticscholar.org/CorpusID:33401607).

1. **[^](#cite_ref-SIMBAD_9-0)** ["HD 125442"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125442). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-07-22.

1. **[^](#cite_ref-Eggleton2008_10-0)** Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", *Monthly Notices of the Royal Astronomical Society*, **389** (2): 869, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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Adapted from the Wikipedia article [HD 125442](https://en.wikipedia.org/wiki/HD_125442) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_125442?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.