HD 86320 Binary star in the constellation Chamaeleon
HD 86320
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation Chamaeleon [ 1]
Right ascension 09h 51m 00.81459s [ 2]
Declination −80° 03′ 39.7714″ [ 2]
Apparent magnitude (V)6.49[ 3] [ 4]
Characteristics
Spectral type B8 IV[ 5]
U−B color index
−0.23[ 6]
B−V color index
+0.06[ 6]
Astrometry Radial velocity (Rv )12.1± 2.1[ 7] km/s Proper motion (μ) RA: −7.109 mas /yr [ 2] Dec.: +8.963 mas /yr [ 2] Parallax (π)3.9544± 0.1015 mas [ 2] Distance 820 ± 20 ly pc ) Absolute magnitude (MV )−0.54[ 1] Orbit [ 8] Period (P)63.52± 5.680 yr Semi-major axis (a)0.1583± 0.0057″ Eccentricity (e)0.50 (fixed) Inclination (i)34.5± 7.0° Longitude of the node (Ω)142.3± 15.8° Periastron epoch (T)± 451.1 JD Argument of periastron (ω)135.2± 20.9° Details A Mass 3.069+1.059 − 1.104[ 9] M ☉ Radius 4.95± 0.25[ 10] R ☉ Luminosity 332.2+16.8 − 15.5[ 2] L ☉ Surface gravity (log g )3.49[ 11] cgs Temperature 10,257± 1[ 9] K Metallicity [Fe/H] 0.00[ 11] dex Rotational velocity (v sin i )>250[ 12] km/s Age 346[ 13] Myr B Mass 1.6[ 8] M ☉ Other designations 18 G. Chamaeleontis [ 14] CPD −79°457FK5 2791GC 13624HD 86320HIP 48320SAO 256666WDS J09510-8004AB[ 15] Database references SIMBAD data
HD 86320 (HIP 48320; 18 G. Chamaeleontis ) is a binary star located in the southern circumpolar constellation Chamaeleon . With a combined apparent magnitude of 6.49,[ 3] naked eye , even under ideal conditions. When resolved, the apparent magnitudes of the components are 6.69 and 8.62 respectively.[ 4] light years based on Gaia DR3 parallax measurements,[ 2] Solar System with a heliocentric radial velocity of roughly km/s [ 7] absolute magnitude of −0.54.[ 1]
The binary natue of this system was first observed in a 1991 Hipparcos multiple star survey.[ 4] years to circle each other in an eccentric orbit at a separation of 0.1583".[ 8] magnitude companion is located roughly 0.1" away at a position angle of 344°.[ 4]
The system has a combined spectral classification of B8 IV,[ 5] evolved B-type subgiant that is beginning to cease hydrogen fusion at its core . The primary has 3.07 times the mass of the Sun [ 9] radius of the Sun .[ 10] luminosity of the Sun [ 2] photosphere at an effective temperature of K [ 9] night sky . HD 86320 A has a solar metallicity ,[ 11] million years old.[ 13] projected rotational velocity that is greater than km/s [ 12] mass of the Sun based on the orbital solution.[ 8]
References
1 2 3 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 6 7 8 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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27– L30. Bibcode :2000A& A...355L..27H . ISSN 0004-6361 . S2CID 17128864 . 1 2 3 4 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 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 . S2CID 119533755 . 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53° . Vol. 1. Bibcode :1975mcts.book.....H . 1 2 Moreno, H.; Carrasco, G. (July 1986). "UBVRI photometry of FK4 and FK4 supplement stars". Astronomy and Astrophysics Supplement Series . 65 : 33– 39. Bibcode :1986A& AS...65...33M . ISSN 0365-0138 . 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759– 771. arXiv :1606.08053 Bibcode :2006AstL...32..759G . doi :10.1134/S1063773706110065 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119231169 . 1 2 3 4 Tokovinin, Andrei (2016). "New Orbits Based on Speckle Interferometry at SOAR" . The Astronomical Journal . 152 (5): 138. arXiv :1608.01242 Bibcode :2016AJ....152..138T . doi :10.3847/0004-6256/152/5/138 1 2 3 4 Quintana, Alexis L; Wright, Nicholas J; García, Juan Martínez (March 17, 2025). "A census of OB stars within 1 kpc and the star formation and core collapse supernova rates of the Milky Way" . Monthly Notices of the Royal Astronomical Society . 538 (3): 1367– 1383. arXiv :2503.08286 Bibcode :2025MNRAS.538.1367Q . doi :10.1093/mnras/staf083 ISSN 0035-8711 . S2CID 276890814 . 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" . Astronomy & Astrophysics . 426 (1): 297– 307. arXiv :astro-ph/0404180 Bibcode :2004A& A...426..297K . doi :10.1051/0004-6361:20035930 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 6077801 . 1 2 3 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5" . Astronomy & Astrophysics . 658 : A91. arXiv :2111.01860 Bibcode :2022A& A...658A..91A . doi :10.1051/0004-6361/202142369 eISSN 1432-0746 . ISSN 0004-6361 . 1 2 Andersen, J.; Nordstrom, B. (1983). "Radial velocities of bright southern stars. I - 139 B-type HR and FK stars". Astronomy and Astrophysics Supplement Series . 52 : 471– 482. Bibcode :1983A& AS...52..471A . 1 2 Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters . 38 (12): 771. arXiv :1606.08814 Bibcode :2012AstL...38..771G . doi :10.1134/S1063773712120031 . ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino . 1 . Bibcode :1879RNAO....1.....G . ↑ "HD 86320" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved November 18, 2025 .
