64 Aquilae

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64 Aquilae
Observation data
Epoch J2000       Equinox J2000
Constellation Aquila
Right ascension 20h 08m 01.82224s [1]
Declination −00° 40′ 41.4663″ [1]
Apparent magnitude  (V)5.97 [2]
Characteristics
Spectral type K1 III/IV [3]
B−V color index +1.023±0.003 [2]
Astrometry
Radial velocity (Rv)−3.64±0.39 [4] km/s
Proper motion (μ)RA: −115.520 [1] mas/yr
Dec.: –67.593 [1] mas/yr
Parallax (π)21.4233±0.0627  mas [1]
Distance 152.2 ± 0.4  ly
(46.7 ± 0.1  pc)
Absolute magnitude  (MV)2.61 [2]
Details [4]
Mass 1.17±0.06  M☉
Radius 4.49±0.13  R☉
Luminosity 11.17 [2]   L☉
Surface gravity (log g)3.31±0.07  cgs
Temperature 4,786±20  K
Metallicity [Fe/H]−0.03±0.03  dex
Rotational velocity (v sin i)1.51 [5]  km/s
Age 6.20±1.18  Gyr
Other designations
64 Aql, BD−01°3899, GC 27930, HD 191067, HIP 99171, HR 7690, SAO 144095 [6]
Database references
SIMBAD data

64 Aquilae, abbreviated 64 Aql, is a star in the equatorial constellation of Aquila. 64 Aquilae is its Flamsteed designation. It is a faint star that requires good viewing conditions to see, having an apparent visual magnitude of 5.97. [2] The distance to 64 Aql, as determined from its annual parallax shift of 21.42  mas , [1] is 152.2  light years. At that distance, the visual magnitude of the star is diminished by an extinction of 0.029 due to interstellar dust. [5] It is moving closer to the Earth with a heliocentric radial velocity of −3.6 km/s. [4]

This is an evolved giant star currently on the red giant branch [5] with a stellar classification of K1 III/IV. [3] The luminosity class of 'III/IV' indicates the spectrum shows a blend of features matching a subgiant and giant star. It is around 6.2 billion years old with 1.17 times the mass of the Sun and has expanded to 4.5 times the Sun's radius. [4] The star is radiating 11 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,786 K. [4]

References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 .
  2. 1 2 3 4 5 6 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, S2CID   119257644.
  3. 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. 1 2 3 4 5 Maldonado, J.; et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics, 554: 18, arXiv: 1303.3418 , Bibcode:2013A&A...554A..84M, doi:10.1051/0004-6361/201321082, S2CID   119289111, A84.
  5. 1 2 3 Jones, M. I.; et al. (December 2011), "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties", Astronomy & Astrophysics, 536: 7, arXiv: 1110.6459 , Bibcode:2011A&A...536A..71J, doi:10.1051/0004-6361/201117887, S2CID   55769003, A71.
  6. ↑ "64 Aql". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 1, 2018.
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