Upsilon Aquilae
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 45m 39.947s[2] |
| Declination | +07° 36′ 47.37″[2] |
| Apparent magnitude (V) | +5.889[3] |
| Characteristics | |
| Spectral type | A3 IV[4] |
| U−B color index | +0.09[5] |
| B−V color index | +0.18[5] |
| Astrometry | |
| Radial velocity (Rv) | −29.9±2.0[6] km/s |
| Proper motion (μ) | RA: +53.593 mas/yr[2] Dec.: −0.223 mas/yr[2] |
| Parallax (π) | 18.884±0.0408 mas[2] |
| Distance | 172.7 ± 0.4 ly (53.0 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.24[1] |
| Details | |
| Mass | 1.68[7] M☉ |
| Luminosity | 10.5[1] L☉ |
| Surface gravity (log g) | 4.21[3] cgs |
| Temperature | 7,906[3] K |
| Metallicity [Fe/H] | −0.05[3] dex |
| Rotational velocity (v sin i) | 22.5[7] km/s |
| Age | 361±308[7] Myr |
| Other designations | |
| υ Aql, 49 Aquilae, BD+07°4210, GC 27342, HD 186689, HIP 97229, HR 7519, SAO 125032, PPM 168596[8] | |
| Database references | |
| SIMBAD | data |
Upsilon Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from υ Aquilae, and abbreviated Upsilon Aql or υ Aql. With an apparent visual magnitude of +5.91[5] it is a faint star but, according to the Bortle Dark-Sky Scale, it is visible to the naked eye from suburban skies. It has an annual parallax shift of 18.9 mas,[9] indicating a distance of 173 light-years (53 parsecs). The star is drifting closer with a radial velocity of −30 km/s.[6]
This is a subgiant star with a stellar classification of A3 IV.[4] The outer atmosphere is radiating energy into space with 10.5[1] times the Sun's luminosity from its photosphere at an effective temperature of 7,906 K,[3] which gives it the white-hot glow of an A-type star. It is 361 million years old with 1.68 times the mass of the Sun and has a relatively high rate of spin with a projected rotational velocity of 22.5 km/s. An infrared excess has been reported, although no circumstellar disk has been resolved.[7]
References
[edit]- ^ a b c d 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.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
- ^ a b 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.
- ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington, Carnegie Institution of Washington: 0, Bibcode:1953GCRV..C......0W.
- ^ a b c d Grandjean, A.; et al. (June 2021), "A SOPHIE RV search for giant planets around young nearby stars (YNS). A combination with the HARPS YNS survey", Astronomy & Astrophysics, 650, id. A39, arXiv:2106.10754, Bibcode:2021A&A...650A..39G, doi:10.1051/0004-6361/202039672.
- ^ "* ups Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-21.
- ^ 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.
