HD 125383
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 in the constellation Lupus. At a combined apparent magnitude of +5.55,[1] it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give distances of 410 light-years (125.8 parsecs) 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 of 301°, as of 2016.[3] They have apparent magnitudes of 5.77 and 7.94.[3]
The primary (A) has a spectral class of G8 III, with the luminosity class 'III' suggesting it is a giant that has exhausted the hydrogen at its core.[6] The star has expanded to 11.8 times the Sun's radius[5] and now radiates 84 times the Sun's luminosity from its photosphere[1] at an effective temperature of 5,784 K.[5] This temperature gives it a yellow hue typical of a 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 and has an effective temperature of 5,947 K.[5] This temperature gives it a yellow hue typical of a G-type star.[8]
References
- ^ a b c d e f g 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. XHIP record for this object at VizieR.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256. HD 125383's database entry at VizieR.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e 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:2510.08691. Bibcode:2025A&A...704A.318K. doi:10.1051/0004-6361/202556860. ISSN 0004-6361.
- ^ a b c Corbally, C. J. (December 1984). "Close visual binaries. III. Parameters and evolutionary status". The Astronomical Journal. 89: 1887–1896. Bibcode:1984AJ.....89.1887C. doi:10.1086/113700. ISSN 0004-6256.
- ^ "HD 125383". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ a b "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.