Omega2 Aquilae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 19m 53.067s[2] |
| Declination | +11° 32′ 05.87″[2] |
| Apparent magnitude (V) | 6.03[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A2 V[4] or F0V[5] |
| U−B color index | +0.087±0.007[1] |
| B−V color index | +0.08[6] |
| Astrometry | |
| Radial velocity (Rv) | −26.0±4.3[7][1] km/s |
| Proper motion (μ) | RA: 44.335 mas/yr[2] Dec.: 22.475 mas/yr[2] |
| Parallax (π) | 11.6957±0.0366 mas[2] |
| Distance | 278.9 ± 0.9 ly (85.5 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.48[1] |
| Details | |
| Mass | 2.10±0.33[3] M☉ |
| Radius | 2.25±0.07[3] R☉ |
| Luminosity | 23.4±1.0[3] L☉ |
| Surface gravity (log g) | 4.06±0.07[3] cgs |
| Temperature | 8,472±125[3] K |
| Rotational velocity (v sin i) | 152[8] km/s |
| Age | 224[8] Myr |
| Other designations | |
| ω2 Aql, 29 Aquilae, BD+11°3802, GC 26660, HD 181383, HIP 95002, HR 7332, SAO 104728, PPM 136128[9] | |
| Database references | |
| SIMBAD | data |
Omega2 Aquilae is a star in the equatorial constellation of Aquila, the eagle.[9] Its name is a Bayer designation that is Latinized from ω2 Aquilae, and abbreviated Omega2 Aql or ω2 Aql. This star has an apparent visual magnitude of 6.0,[1] which is close to the lower limit of detectability with the naked eye. According to the Bortle Dark-Sky Scale, this star can be viewed from dark rural skies. As the Earth orbits about the Sun, this star undergoes a parallax shift of 11.7 mas.[10] This is equivalent to a physical distance of 279 light-years (86 parsecs) from Earth. The star is drifting closer to the Sun with a radial velocity of −26 km/s.[1]
Analysis of the spectrum of this white-hued star shows it to match a stellar classification of A2 V,[4] indicating it is an A-type main sequence star. (A 2001 study found a discrepant class of F0V.[5]) It has about 2.25 the size and 2.1 times the mass of the Sun. The star is radiating 23.4 times the luminosity of the Sun from its photosphere at an effective temperature of 9,245 K,[3] giving it the white hue of an A-type star.[11] Omega2 Aquilae is 224 million years old and is spinning rapidly with a projected rotational velocity of 152 km/s.[8]
References
[edit]- ^ a b c d e f g 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 f g Stassun, Keivan G.; et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467.
- ^ 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 Paunzen, E.; et al. (July 2001), "A spectroscopic survey for lambda Bootis stars. II. The observational data", Astronomy and Astrophysics, 373: 625–632, Bibcode:2001A&A...373..625P, doi:10.1051/0004-6361:20010630.
- ^ Osawa, K.; Hata, S. (1962), "Three-color photometry of B8-A2 stars (II).", Annals of the Tokyo Astronomical Observatory, 7: 209, Bibcode:1962AnTok...7..209O.
- ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
- ^ a b c David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b "ome02 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.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
