Omega1 Aquarii

Omega1 Aquarii, Latinized from ω1 Aquarii, is the Bayer designation for a single[6] star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 4.96,[2] this star is faintly visible to the naked eye from the suburbs. The distance to this star can be estimated from the parallax as approximately 138 light-years (42 parsecs).[1]

For other stars with this Bayer designation, see ω Aquarii.
Omega1 Aquarii
Location of ω1 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 39m 47.06545s[1]
Declination –14° 13′ 19.7374″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type A7 IV[3]
B−V color index +0.25[2]
Astrometry
Radial velocity (Rv)–2[4] km/s
Proper motion (μ) RA: +54.147[1] mas/yr
Dec.: −50.151[1] mas/yr
Parallax (π)23.5523 ± 0.4848 mas[1]
Distance138 ± 3 ly
(42.5 ± 0.9 pc)
Absolute magnitude (MV)+1.78[5]
Details
Mass1.95 M☉[6]
1.88±0.04[7] M☉
Radius2.44+0.11
−0.25[1] R☉
Luminosity14.8±0.3[1] L☉
Temperature7,249+399
−150 K
Rotational velocity (v sin i)105[8] km/s
Age790 Myr[6]
600[9] Myr
Other designations
ω1 Aqr, 102 Aquarii, BD–15 6471, HD 222345, HIP 116758, HR 8968, SAO 165818[10]
Database references
SIMBADdata

The stellar classification of this star is A7 IV,[3] matching a subgiant star. It is spinning rapidly with a projected rotational velocity of 105 km/s.[8] The star is about 600[9] million years old and is radiating 15[1] times the Sun's luminosity. It has 1.9[7] times the mass of the Sun and 2.4[1] times the Sun's radius.

References
  1. 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.
  2. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. 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.
  6. De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  7. 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.
  8. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  9. Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.
  10. "* ome01 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.
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