Astronomy:64 Aquilae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 5, Bibcode: 1999MSS...C05....0H.
- ↑ 4.0 4.1 4.2 4.3 4.4 Maldonado, J. et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics 554: 18, doi:10.1051/0004-6361/201321082, A84, Bibcode: 2013A&A...554A..84M.
- ↑ 5.0 5.1 5.2 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, doi:10.1051/0004-6361/201117887, A71, Bibcode: 2011A&A...536A..71J.
- ↑ "64 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=64+Aql.
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