# HD 125383

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Binary star in the constellation Lupus

HD 125383 Observation data Epoch J2000 Equinox ICRS Constellation Lupus[1] A Right ascension 14h 20m 09.7016s[2] Declination −43° 03′ 31.834″[2] Apparent magnitude (V) 5.77[3] B Right ascension 14h 20m 09.4278s[4] Declination −43° 03′ 30.025″[4] Apparent magnitude (V) 7.94[3] Characteristics Evolutionary stage giant + subgiant[5] Spectral type G8 III + G0 IV[6] B−V color index 0.907±0.001[1] Astrometry A Radial velocity (Rv) −19.0±0.4[1] km/s Proper motion (μ) RA: −9.840 mas/yr[2] Dec.: +7.828 mas/yr[2] Parallax (π) 7.9485±0.0563 mas[2] Distance 410 ± 3 ly (125.8 ± 0.9 pc) Absolute magnitude (MV) +0.3[1] B Proper motion (μ) RA: −7.301 mas/yr[4] Dec.: +5.219 mas/yr[4] Parallax (π) 8.0287±0.0361 mas[4] Distance 406 ± 2 ly (124.6 ± 0.6 pc) Details[5] A Radius 11.77+0.06 −0.05 R☉ Luminosity 84[1] L☉ Surface gravity (log g) 3.00±0.00 cgs Temperature 5,784+30 −46 K B Radius 2.02±0.08 R☉ Surface gravity (log g) 3.84+0.68 −0.52 cgs Temperature 5,947+71 −73 K Other designations CD−42°9235, HD 125383, HIP 70054, HR 5362, WDS J14202-4304[7] Database references SIMBAD HD 125383 A HD 125383 B

**HD 125383** is a [binary star](/source/Binary_star) in the constellation [Lupus](/source/Lupus_(constellation)). At a combined [apparent magnitude](/source/Apparent_magnitude) of +5.55,[1] it is faintly visible to the [naked eye](/source/Naked_eye) in locations far from [light pollution](/source/Light_pollution). [Parallax](/source/Parallax) measurements give distances of 410 [light-years](/source/Light-year) (125.8 [parsecs](/source/Parsec)) and 406 light-years (124.6 parsecs) for the primary and secondary, respectively.

## Characteristics

The two components are separated by 3.5" along a [position angle](/source/Position_angle) of 301°, as of 2016[\[update\]](https://en.wikipedia.org/w/index.php?title=HD_125383&action=edit).[3] They have [apparent magnitudes](/source/Apparent_magnitude) of 5.77 and 7.94.[3]

The primary (A) has a [spectral class](/source/Spectral_class) of G8 III, with the [luminosity class](/source/Luminosity_class) 'III' suggesting it is a [giant](/source/Giant_star) that has exhausted the [hydrogen](/source/Hydrogen) at its [core](/source/Stellar_core).[6] The star has expanded to 11.8 times the [Sun's radius](/source/Sun's_radius)[5] and now radiates 84 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere)[1] at an [effective temperature](/source/Effective_temperature) of 5,784 [K](/source/Kelvin).[5] This temperature gives it a yellow hue typical of a [G-type star](/source/G-type_star).[8]

The secondary (B) has a spectral class of G0 IV, with the luminosity class 'IV' suggesting it is a subgiant that has exhausted the hydrogen at its core.[6] The star has expanded to 2.0 times the [Sun's radius](/source/Sun's_radius) and has an [effective temperature](/source/Effective_temperature) of 5,947 [K](/source/Kelvin).[5] This temperature gives it a yellow hue typical of a [G-type star](/source/G-type_star).[8]

## References

1. ^ [***a***](#cite_ref-XHIP_1-0) [***b***](#cite_ref-XHIP_1-1) [***c***](#cite_ref-XHIP_1-2) [***d***](#cite_ref-XHIP_1-3) [***e***](#cite_ref-XHIP_1-4) [***f***](#cite_ref-XHIP_1-5) [***g***](#cite_ref-XHIP_1-6) 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=70054&-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-DR3a_2-0) [***b***](#cite_ref-DR3a_2-1) [***c***](#cite_ref-DR3a_2-2) [***d***](#cite_ref-DR3a_2-3) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6103516765233511808%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-WDS_3-0) [***b***](#cite_ref-WDS_3-1) [***c***](#cite_ref-WDS_3-2) [***d***](#cite_ref-WDS_3-3) 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"](https://doi.org/10.1086%2F323920). *The Astronomical Journal*. **122** (6): 3466–3471. [Bibcode](/source/Bibcode_(identifier)):[2001AJ....122.3466M](https://ui.adsabs.harvard.edu/abs/2001AJ....122.3466M). [doi](/source/Doi_(identifier)):[10.1086/323920](https://doi.org/10.1086%2F323920). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256). [HD 125383's database entry](https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=B/wds&recno=87449) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-DR3b_4-0) [***b***](#cite_ref-DR3b_4-1) [***c***](#cite_ref-DR3b_4-2) [***d***](#cite_ref-DR3b_4-3) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6103516765233511680%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Kammerer2025_5-0) [***b***](#cite_ref-Kammerer2025_5-1) [***c***](#cite_ref-Kammerer2025_5-2) [***d***](#cite_ref-Kammerer2025_5-3) [***e***](#cite_ref-Kammerer2025_5-4) Kammerer, J.; Winterhalder, T. O.; Lacour, S.; Stolker, T.; Marleau, G.-D.; Balmer, W. O.; Moore, A. F.; Piscarreta, L.; Toci, C.; Mérand, A.; Nowak, M.; Rickman, E. L.; Pueyo, L.; Pourré, N.; Nasedkin, E. (2025-12-01). "The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions". *Astronomy & Astrophysics*. **704**: A318. [arXiv](/source/ArXiv_(identifier)):[2510.08691](https://arxiv.org/abs/2510.08691). [Bibcode](/source/Bibcode_(identifier)):[2025A&A...704A.318K](https://ui.adsabs.harvard.edu/abs/2025A&A...704A.318K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202556860](https://doi.org/10.1051%2F0004-6361%2F202556860). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. ^ [***a***](#cite_ref-Corbally1984_6-0) [***b***](#cite_ref-Corbally1984_6-1) [***c***](#cite_ref-Corbally1984_6-2) Corbally, C. J. (December 1984). "Close visual binaries. III. Parameters and evolutionary status". *The Astronomical Journal*. **89**: 1887–1896. [Bibcode](/source/Bibcode_(identifier)):[1984AJ.....89.1887C](https://ui.adsabs.harvard.edu/abs/1984AJ.....89.1887C). [doi](/source/Doi_(identifier)):[10.1086/113700](https://doi.org/10.1086%2F113700). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-SIMBAD_7-0)** ["HD 125383"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125383). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg).

1. ^ [***a***](#cite_ref-csiro_8-0) [***b***](#cite_ref-csiro_8-1) ["The Colour of Stars"](https://web.archive.org/web/20131203222826/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html). *Australia Telescope, Outreach and Education*. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from [the original](http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html) on 2013-12-03. Retrieved 2012-01-16.

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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