HD 165259

Last updated
HD 165259
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Apus
A
Right ascension 18h 12m 34.08358s [1]
Declination −73° 40′ 20.7691″ [1]
Apparent magnitude  (V)5.91 [2]
B
Right ascension 18h 12m 33.47381s [3]
Declination −73° 40′ 20.9419″ [3]
Apparent magnitude  (V)9.03 [2]
Characteristics
A
Spectral type F5V [4]
U−B color index +0.05 [5]
B−V color index +0.46 [5]
B
Spectral type G1 V [6]
U−B color index +0.74 [6]
B−V color index +1.06 [6]
Astrometry
Radial velocity (Rv)13.1±1 [7]  km/s
Absolute magnitude  (MV)+2.74 [8]
A
Proper motion (μ)RA: −91.400 [1]   mas/yr
Dec.: −254.341 [1]   mas/yr
Parallax (π)23.6778 ± 0.0399  mas [1]
Distance 137.7 ± 0.2  ly
(42.23 ± 0.07  pc)
B
Proper motion (μ)RA: −62.130 [3]   mas/yr
Dec.: −241.999 [3]   mas/yr
Parallax (π)23.7101 ± 0.0338  mas [3]
Distance 137.6 ± 0.2  ly
(42.18 ± 0.06  pc)
Orbit [9]
PrimaryA
CompanionB
Period (P)542 yr
Semi-major axis (a)98  AU
Orbit [9]
PrimaryAa
CompanionAb
Period (P)31.536 yr
Semi-major axis (a)13.3  AU
Details
Aa
Mass 1.22 [10]   M☉
Radius 2.04 [1]   R☉
Luminosity 6.2 [1]   L☉
Surface gravity (log g)3.92 [11]   cgs
Temperature 6,411±218 [11]   K
Metallicity [Fe/H]+0.26 [12]   dex
Rotational velocity (v sin i)<5 [13]  km/s
Age 1.8+0.1
−0.2 [13]   Gyr
Ab
Mass 0.76 [9]   M☉
B
Mass 0.85 [9]   M☉
Surface gravity (log g)4.3 [14]   cgs
Temperature 5,328 [14]   K
Metallicity [Fe/H]−0.22 [14]   dex
Other designations
67 G. Apodis [15] , CD−73°1348, CPD−73°1888, GC  24731, HD  165259, HIP  89234, HR  6751, SAO  257571, WDS J18126-7340AB [16]
Database references
SIMBAD data

HD 165259, also known as HR 6751 is a triple star system located in the southern circumpolar constellation of Apus. It has an apparent magnitude of 5.86, [8] making it faintly visible to the naked eye Parallax measurements place the system at a distance of 138 light years, [1] [3] and it is currently receding with a heliocentric radial velocity of 13.1  km/s . [7]

HD 165259 consists of two main sequence stars, with stellar classifications of F5 V [4] and G1 V, [6] separated by two arc-seconds as of 2020. [17] Speckle interferometry in 2008 revealed the primary to be a close binary itself, with the two components separated by 0.3″ . [18] By 2020, the separation had decreased to 0.2″ . [17] The outer pair take 542 years to complete a revolution while the inner pair complete their orbit within 32 years. [9]

At present the primary has 122% the mass of the Sun [10] and a slightly enlarged radius of 2.0  R☉ as it is nearing the end of its main sequence life. [1] It radiates at 6.2 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,411  K , [11] giving a yellow-white hue. HD 165259A has an iron abundance 82% above solar levels, [12] making it metal enriched. It is estimated to be nearly 2 billion years old and has a projected rotational velocity of less than 5  km/s . [13] HD 165259B has 85% the mass of the Sun [9] and an effective temperature of 5,328 K, [14] giving an orange glow. The faint star orbiting the primary has a mass 76% that of the Sun. [9]

Related Research Articles

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<span class="mw-page-title-main">2 Piscis Austrini</span> Star in the constellation Microscopium

2 Piscis Austrini, also known as HD 200763 or simply 2 PsA, is a solitary orange hued star located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The object has an apparent magnitude of 5.2, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, it is estimated to be 354 light years away from the Solar System. However, it is receding with a poorly constrained heliocentric radial velocity of 3.1 km/s. At its current distance, 2 PsA's brightness is diminished by 0.11 magnitudes due to interstellar dust. It has an absolute magnitude of 0.19.

<span class="mw-page-title-main">HD 26764</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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HD 46588 is a star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.44, allowing it to be faintly seen with the naked eye. The object is relatively close at a distance of only 59 light years but is receding with a heliocentric radial velocity of 15 km/s.

HD 193373 is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21, placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant and it is currently receding with a heliocentric radial velocity of 22.7 km/s.

HD 75171, also known as HR 3495, is a solitary, white hued star located in the southern constellation of Volans. It has an apparent magnitude of 6.02, making it faintly visible to the naked eye under ideal conditions. The object is relatively close at a distance of 191 light years but is receding with a heliocentric radial velocity of 10.7 km/s. Eggen (1995) lists it as a probable member of the Hyades Supercluster.

HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91, making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years, and it is currently receding with a heliocentric radial velocity of 8 km/s.

<span class="mw-page-title-main">HD 106248</span> Star in the constellation Chamaeleon

HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34, placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System. It appears to be receding with a heliocentric radial velocity of 34.5 km/s. At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population.

<span class="mw-page-title-main">HD 36187</span> Star in the constellation of Columba

HD 36187, also known as HR 1835, is a solitary, bluish-white hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.55, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, it is estimated to be 282 light years away from the Solar System. However, it is receding rapidly with a heliocentric radial velocity of 50 km/s. At its current distance, HD 36187's brightness is diminished by 0.21 magnitude due to interstellar dust.

<span class="mw-page-title-main">HD 187420/187421</span> Binary star in the constellation Telescopium

HD 187420 and HD 187421, are the components of a binary star located in the southern constellation Telescopium. Gaia DR3 parallax measurements place the stars at a distance of 407 and 414 light years respectively. The two are separated by 23″, and they are approaching the Solar System with heliocentric radial velocities of −17.9 km/s and −21.5 km/s respectively.

<span class="mw-page-title-main">HD 27322</span> A-type dwarf; Camelopardalis

HD 27322, also known as HR 1342, is a binary star located in the northern circumpolar constellation Camelopardalis. The visible component is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.92. The object is located relatively close at a distance of 313 light-years based on Gaia DR3 parallax measurements, and it is drifting closer with a heliocentric radial velocity of approximately −13 km/s. At its current distance, HD 27322's brightness is diminished by 0.24 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.98.

HD 181295 is a star located in the southern constellation Telescopium. It has an apparent magnitude of 6.42, placing it near the limit of naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of approximately 252 light-years based on Gaia DR3 parallax measurements, and it is currently drifting closer with a heliocentric radial velocity of −35.7 km/s. At its current distance, HD 181295's brightness is diminished by 0.22 magnitudes due to interstellar extinction and it has an absolute magnitude +2.14.

<span class="mw-page-title-main">HD 204904</span> Spectroscopic binary in the constellation Octans

HD 204904 is a spectroscopic binary located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively close at distance of 212 light-years based on Gaia DR3 parallax measurements and it is drifting closer with a heliocentric radial velocity of −5.2 km/s. At its current distance, HD 204904's brightness is diminished by 0.19 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.13.

<span class="mw-page-title-main">HD 29678</span> A-type dwarf; Camelopardalis

HD 29678, also known as HR 1491, is a solitary star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a yellowish-white hued point of light with an apparent magnitude of 5.95. The object is located relatively close at a distance of 155 light-years and it is drifting closer with a somewhat constrained heliocentric radial velocity of approximately −6.0 km/s. At is current distance, HD 29678's brightness is diminished by 0.13 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.60. Its observed kinematics suggest that it is a member of the Pleiades supercluster.

<span class="mw-page-title-main">HD 10390</span> B-type main-sequence star; Triangulum

HD 10390 is a solitary star located in the northern constellation Triangulum. It is faintly visible to the naked eye as a bluish-white hued point of light with an apparent magnitude of 5.64. The object is located relatively close at a distance of 292 light-years based on Gaia DR3 parallax measurements and it is drifting closer with a heliocentric radial velocity of −1.9 km/s. At its current distance, HD 10390's brightness is diminished by an interstellar extinction of only five-hundredths of a magnitude and it has an absolute magnitude of +1.00.

<span class="mw-page-title-main">HD 21819</span> A-type main-sequence star; Camelopardalis

HD 21819, also designated as HR 1073, is a solitary star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.97, making faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 248 light-years based on Gaia DR3 parallax measurements and it is drifting closer with a heliocentric radial velocity of −6.5 km/s. At its current distance, HD 21819's brightness is diminished by an interstellar extinction of 0.17 magnitudes and it has an absolute magnitude of +1.62.

References

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  15. ↑ 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.
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  18. ↑ Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I. (2010). "Speckle Interferometry at the Blanco and SOAR Telescopes in 2008 and 2009". The Astronomical Journal. 139 (2): 743–756. arXiv: 0911.5718 . Bibcode:2010AJ....139..743T. doi:10.1088/0004-6256/139/2/743. S2CID   26379213.
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