22 Aquilae
Star in the constellation Aquila
From Wikipedia, the free encyclopedia
22 Aquilae, abbreviated 22 Aql, is a star in the equatorial constellation of Aquila. 22 Aquilae is its Flamsteed designation. It is a faint star but visible to the naked eye with an apparent visual magnitude of 5.59.[2] The distance to 22 Aql can be estimated from its annual parallax shift of 4.74 mas,[1] which yields a separation of 690 light years. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.[5]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 16m 31.03180s[1] |
| Declination | +04° 50′ 05.2523″[1] |
| Apparent magnitude (V) | 5.59[2] |
| Characteristics | |
| Spectral type | A1 V[3] or A3 IV[4] |
| B−V color index | 0.101±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −22.8±4.3[5] km/s |
| Proper motion (μ) | RA: +14.306[1] mas/yr Dec.: –11.083[1] mas/yr |
| Parallax (π) | 4.7392±0.0910 mas[1] |
| Distance | 690 ± 10 ly (211 ± 4 pc) |
| Absolute magnitude (MV) | −0.48[2] |
| Details | |
| Mass | 2.89±0.11[6] M☉ |
| Radius | 7.0[7] R☉ |
| Luminosity | 161+27 −23[6] L☉ |
| Temperature | 8453±78[6] K |
| Rotational velocity (v sin i) | 70[6] km/s |
| Age | 370[8] Myr |
| Other designations | |
| 22 Aql, AG+04 2489, BD+04°4045, GC 26567, HD 180482, HIP 94727, HR 7303, SAO 143134, 2MASS J19163102+0450052[9] | |
| Database references | |
| SIMBAD | data |
Cowley et al. (1969) assigned this star a stellar classification of A3 IV,[4] matching an evolving subgiant star that has exhausted the hydrogen at its core. Houk and Swift (1999) reassigned it as an A-type main-sequence star with a class of A1 V.[3] It has nearly three times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s.[6] The star is radiating 161[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,453 K.[6]