HD 125383

HD 125383
Observation data; Epoch J2000 Equinox ICRS
Constellation	Lupus
	A
Right ascension	14h 20m 09.7016s
Declination	−43° 03′ 31.834″
Apparent magnitude (V)	5.77
	B
Right ascension	14h 20m 09.4278s
Declination	−43° 03′ 30.025″
Apparent magnitude (V)	7.94
Characteristics
Evolutionary stage	giant + subgiant
Spectral type	G8 III + G0 IV
B−V color index	0.907±0.001
Astrometry
A
Radial velocity (Rv)	−19.0±0.4 km/s
Proper motion (μ)	RA: −9.840 mas/yr ; Dec.: +7.828 mas/yr
Parallax (π)	7.9485±0.0563 mas
Distance	410 ± 3 ly ; (125.8 ± 0.9 pc)
Absolute magnitude (MV)	+0.3
B
Proper motion (μ)	RA: −7.301 mas/yr ; Dec.: +5.219 mas/yr
Parallax (π)	8.0287±0.0361 mas
Distance	406 ± 2 ly ; (124.6 ± 0.6 pc)
Details
A
Radius	11.77+0.06; −0.05 R☉
Luminosity	84 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
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, 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^[update]. They have apparent magnitudes of 5.77 and 7.94.

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. The star has expanded to 11.8 times the Sun's radius and now radiates 84 times the Sun's luminosity from its photosphere at an effective temperature of 5,784 K. This temperature gives it a yellow hue typical of a G-type star.

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. The star has expanded to 2.0 times the Sun's radius and has an effective temperature of 5,947 K. This temperature gives it a yellow hue typical of a G-type star.

References

1 2 3 4 5 6 7 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.
1 2 3 4 5 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.
1 2 3 4 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.
1 2 3 4 5 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.
1 2 3 4 5 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.
1 2 3 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.
1 2 "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.

[XHIP-1] 1 2 3 4 5 6 7 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.

[DR3a-2] 1 2 3 4 5 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.

[WDS-3] 1 2 3 4 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.

[DR3b-4] 1 2 3 4 5 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.

[Kammerer2025-5] 1 2 3 4 5 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.

[Corbally1984-6] 1 2 3 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.

[SIMBAD-7] "HD 125383". SIMBAD. Centre de données astronomiques de Strasbourg.

[csiro-8] 1 2 "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.