Astronomy:HD 125383
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|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[2] mas/yr Dec.: +7.828[2] mas/yr |
| Parallax (π) | 7.9485 ± 0.0563[2] mas |
| Distance | 410 ± 3 ly (125.8 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.3[1] |
| B | |
| Proper motion (μ) | RA: −7.301 mas/yr Dec.: +5.219 mas/yr |
| Parallax (π) | 8.0287 ± 0.0361[4] mas |
| 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 | |
| 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[update].[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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 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". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. HD 125383's database entry at VizieR.
- ↑ 4.0 4.1 4.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 5.3 5.4 Kammerer, J.; Winterhalder, T. O.; Lacour, S.; Stolker, T.; Marleau, G.-D.; Balmer, W. O.; Moore, A. F.; Piscarreta, L. et al. (2025-12-01). "The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions" (in en). Astronomy & Astrophysics 704: A318. doi:10.1051/0004-6361/202556860. ISSN 0004-6361. Bibcode: 2025A&A...704A.318K.
- ↑ 6.0 6.1 6.2 Corbally, C. J. (December 1984). "Close visual binaries. III. Parameters and evolutionary status." (in en). The Astronomical Journal 89: 1887–1896. doi:10.1086/113700. ISSN 0004-6256. Bibcode: 1984AJ.....89.1887C.
- ↑ "HD 125383". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125383.
- ↑ 8.0 8.1 "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16.
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