22 Aquilae

22 Aquilae
Observation data
Epoch J2000      Equinox J2000
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]
Distance690 ± 10 ly
(211 ± 4 pc)
Absolute magnitude (MV)−0.48[2]
Details
Mass2.89±0.11[6] M☉
Luminosity161+27
−23[6] L☉
Temperature8453±78[6] K
Rotational velocity (v sin i)70[6] km/s
Other designations
22 Aql, AG+04 2489, BD+04° 4045, GC 26567, HD 180482, HIP 94727, HR 7303, SAO 143134, 2MASS J19163102+0450052[7]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).