| 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 | |
| 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]
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