Omega1 Aquarii

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For other star systems with this Bayer designation, see Omega Aquarii.
Omega1 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg
Location of ω1 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 39m 47.06778s[1]
Declination –14° 13′ 19.8376″[1]
Apparent magnitude (V) 4.96[2]
Spectral type A7 IV[3]
B−V color index +0.25[2]
Radial velocity (Rv) –2[4] km/s
Proper motion (μ) RA: +51.25[1] mas/yr
Dec.: –55.35[1] mas/yr
Parallax (π) 22.94 ± 1.05[1] mas
Distance 142 ± 7 ly
(44 ± 2 pc)
Absolute magnitude (MV) +1.78[5]
Luminosity 16[5] L
Rotational velocity (v sin i) 105[6] km/s
Age 0.6[7] Gyr
Other designations
ω1 Aqr, 102 Aquarii, BD–15 6471, HD 222345, HIP 116758, HR 8968, SAO 165818.[8]
Database references

Omega1 Aquarii, Latinized from ω1 Aquarii, is the Bayer designation for a star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 4.96,[2] this star is visible to the naked eye from the suburbs. The distance to this star can be estimated from the parallax as roughly 142 light-years (44 parsecs), with a 5% margin of error.[1]

This is a subgiant star, having a stellar classification of A7 IV.[3] It is spinning rapidly with a projected rotational velocity of 105 km/s.[6] The star is about 600[7] million years old and is radiating 16[5] times the Sun's luminosity.


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c 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. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W. 
  5. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ a b Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  7. ^ a b Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966Freely accessible, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135. 
  8. ^ "* ome01 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24. 

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