Astronomy:Omega2 Aquilae
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| Observation data 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[2] mas/yr Dec.: 22.475[2] mas/yr |
| Parallax (π) | 11.6957 ± 0.0366[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Stassun, Keivan G. et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, Bibcode: 2019AJ....158..138S.
- ↑ 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 Paunzen, E. et al. (July 2001), "A spectroscopic survey for lambda Bootis stars. II. The observational data", Astronomy and Astrophysics 373: 625–632, doi:10.1051/0004-6361:20010630, Bibcode: 2001A&A...373..625P.
- ↑ 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, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E.
- ↑ 8.0 8.1 8.2 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 "ome02 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ome02+Aql.
- ↑ 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. 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, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16.
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