Location of ω Aquilae (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19 17 48.99957 |
| Declination | +11° 35′ 43.5234″ |
| Apparent magnitude (V) | 5.284 |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | F0 IV |
| U−B color index | +0.204 |
| B−V color index | +0.238 |
| Astrometry | |
| Radial velocity (Rv) | −14.3 km/s |
| Proper motion (μ) | RA: +0.706 mas/yr Dec.: +13.947 mas/yr |
| Parallax (π) | 8.5341 ± 0.1401 mas |
| Distance | 382 ± 6 ly (117 ± 2 pc) |
| Absolute magnitude (MV) | −0.24 |
| Details | |
| Mass | 2.85±0.06 M☉ |
| Radius | 5.08+0.34 −0.25 R☉ |
| Luminosity | 84.7±1.6 L☉ |
| Temperature | 7,766+206 −245 K |
| Rotational velocity (v sin i) | 89 km/s |
| Other designations | |
| ω Aql, 25 Aquilae, BD+11°3790, FK5 725, HD 180868, HIP 94834, HR 7315, SAO 104691 | |
| Database references | |
| SIMBAD | data |
Omega Aquilae, which is Latinized from ω Aquilae, is the Bayer designation for a single star in the equatorial constellation of Aquila. With an apparent visual magnitude of 5.2 it is a faint, yellow-white hued star that can be seen with the naked eye in dark skies. From the annual parallax shift of 8.53 mas, the distance to this star can be estimated as 382 light-years (117 parsecs), give or take a 6 light year margin of error. It is drifting closer to the Sun with a radial velocity of −14 km/s.
The spectrum of this star fits a stellar classification of F0 IV. Typically, a luminosity class of IV means that the star is in the subgiant stage. It is rotating rapidly with a projected rotational velocity of 115 km/s. This is causing an equatorial bulge that is 5% larger than the polar radius. The star has 2.85 times the mass of the Sun and five times the Sun's radius. It is radiating 85 times the luminosity of the Sun from its photosphere at an effective temperature of 7,766 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G.
- ^ Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- "ome01 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-28.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
External links
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