HD 165259

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Template:Short description

HD 165259
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.91[2]
B
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 9.03[2]
Characteristics
A
Spectral type F5V[4]
U−B Template:Engvar +0.05[5]
B−V Template:Engvar +0.46[5]
B
Spectral type G1 V[6]
U−B Template:Engvar +0.74[6]
B−V Template:Engvar +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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd 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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[9]
PrimaryA
CompanionB
Period (P)450 yr
Semi-major axis (a)2.014″
Eccentricity (e)0.3
Inclination (i)46.7°
Longitude of the node (Ω)65.3°
Periastron epoch (T)2147.2
Argument of periastron (ω)
(primary)		348.8°
Orbit[9]
PrimaryAa
CompanionAb
Period (P)44.2 yr
Semi-major axis (a)0.373″
Eccentricity (e)0
Inclination (i)83.5°
Longitude of the node (Ω)105.2°
Periastron epoch (T)2027.22
Argument of periastron (ω)
(primary)		0°
Details
Aa
Mass1.46[9] Template:Solar mass
Radius2.04[1] Template:Solar radius
Luminosity6.2[1] Template:Solar luminosity
Surface gravity (log g)3.92[10] cgs
Temperature6,411±218[10] K
Metallicity [Fe/H]+0.26[11] dex
Rotational velocity (v sin i)<5[12] km/s
Age1.8Script error: No such module "Su".[12] Gyr
Ab
Mass0.73[9] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
B
Mass0.82[9] Template:Solar mass
Surface gravity (log g)4.3[13] cgs
Temperature5,328[13] K
Metallicity [Fe/H]−0.22[13] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[14]
Database references
SIMBADdata

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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 Script error: No such module "val"..[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.[15] Speckle interferometry in 2008 revealed the primary to be a close binary itself, with the two components separated by Script error: No such module "val"..[16] By 2020, the separation had decreased to Script error: No such module "val"..[15] The outer pair take 542 years to complete a revolution while the inner pair complete their orbit within 32 years.[17]

At present the primary is somewhat more massive than the Sun and a slightly enlarged radius of Template:Solar radius 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 Script error: No such module "val".,[10] giving a yellow-white hue. HD 165259A has an iron abundance 82% above solar levels,[11] making it metal enriched. It is estimated to be nearly 2 billion years old and has a projected rotational velocity of less than Script error: No such module "val"..[12] HD 165259B has 82% the mass of the Sun[9] and an effective temperature of 5,328 K,[13] giving an orange glow. The faint star orbiting the primary has a mass 73% that of the Sun.[9]

References

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  1. ↑ a b c d e f g h i j Template:Cite Gaia DR3
  2. ↑ a b Script error: No such module "Citation/CS1".
  3. ↑ a b c d e f Template:Cite Gaia DR3
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b c d Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b Script error: No such module "Citation/CS1".
  12. ↑ a b c Script error: No such module "Citation/CS1".
  13. ↑ a b c d Script error: No such module "Citation/CS1".
  14. ↑ Template:Cite simbad
  15. ↑ a b Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
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External links

Template:Stars of Apus

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