Astronomy:22 Aquilae
| Observation data Equinox J2000.0]] (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[1] mas |
| Distance | 690 ± 10 ly (211 ± 4 pc) |
| Absolute magnitude (MV) | −0.48[2] |
| Details | |
| Mass | 2.89±0.11[6] M☉ |
| Luminosity | 161+27 −23[6] L☉ |
| Temperature | 8453±78[6] K |
| Rotational velocity (v sin i) | 70[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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 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 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 5.0 5.1 Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "22 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=22+Aql.
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