Upsilon Aquarii

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Upsilon Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg

Location of υ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 34m 41.63641s[1]
Declination –20° 42′ 29.5779″[1]
Apparent magnitude (V) +5.21[2]
Spectral type F5 V[3]
B−V color index +0.44[2]
Radial velocity (Rv) –5.2[4] km/s
Proper motion (μ) RA: +220.78[1] mas/yr
Dec.: –146.76[1] mas/yr
Parallax (π) 44.09 ± 0.26[1] mas
Distance 74.0 ± 0.4 ly
(22.7 ± 0.1 pc)
Absolute magnitude (MV) +3.44[4]
Surface gravity (log g) 4.11[3] cgs
Temperature 6,597[3] K
Metallicity [Fe/H] –0.04[3] dex
Rotational velocity (v sin i) 34.9[5] km/s
Age 0.9[4] Gyr
Other designations
59 Aquarii, BD-21 6251, FK5 849, Gl 863.2, HD 213845, HIP 111449, HR 8592, SAO 191235.[6]
Database references

Upsilon Aquarii (υ Aqr, υ Aquarii) is the Bayer designation for a binary star[7] in the equatorial constellation of Aquarius. It is a faint naked eye star with an apparent visual magnitude of 5.21.[2] Parallax measurements give a distance estimate of 74.0 light-years (22.7 parsecs) from Earth.[1] This is a high proper-motion star.[6]

Upsilon Aquarii is an F-type main sequence star with a stellar classification of F5 V.[3] With an effective temperature of 6,597,[3] it shines with the yellow-white hue of an F-type star.[8] An orbiting companion star was detected in 2007 at the Gemini Observatory.[7]


  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, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  3. ^ a b c d e f Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770Freely accessible, doi:10.1086/504637. 
  4. ^ a b c Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, Bibcode:2004A&A...418..989N, arXiv:astro-ph/0405198Freely accessible, doi:10.1051/0004-6361:20035959. 
  5. ^ Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377. 
  6. ^ a b "LTT 9081 -- High proper-motion Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-03. 
  7. ^ a b Lafrenière, David; et al. (2007), "The Gemini Deep Planet Survey", The Astrophysical Journal, 670 (2): 1367–1390, Bibcode:2007ApJ...670.1367L, arXiv:0705.4290Freely accessible, doi:10.1086/522826. 
  8. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-07-02. 

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