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]
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: +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)
Details
Rotational velocity (v sin i) 105[5] km/s
Age 0.6[6] Gyr
Other designations
102 Aquarii, BD–15 6471, HD 222345, HIP 116758, HR 8968, SAO 165818.[7]
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Omega1 Aquarii1 Aqr, 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.[5]

References[edit]

  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:0708.1752, 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, Bibcode:1988mcts.book.....H. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. ^ 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/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  6. ^ 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. 
  7. ^ "102 Aqr -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-06-24. 

External links[edit]