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Upsilon Aquarii

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Radial velocity (Rv)</td><td>–5.2[4] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: +220.78[1] mas/yr
Dec.: –146.76[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>44.09 ± 0.26[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value). ± Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value).ly
(Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value). ± Lua error in Module:Math at line 495: attempt to index field 'ParserFunctions' (a nil value).pc)</td></tr><tr style="vertical-align:top;"><td>Absolute magnitude (MV)</td><td>+3.44[4]</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:baseline;"><td>Surface gravity (log g)</td><td>4.11[3] cgs</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>6,597[3] K</td></tr><tr style="vertical-align:baseline;"><td>Metallicity [Fe/H]</td><td>–0.04[3] dex</td></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>34.9[5] km/s</td></tr><tr style="vertical-align:baseline;"><td>Age</td><td>0.9[4] Gyr</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
59 Aquarii, BD-21 6251, FK5 849, Gl 863.2, HD 213845, HIP 111449, HR 8592, SAO 191235.[6]
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Upsilon Aquarii <tr><td colspan="2" style="text-align:center;">

Location of υ Aquarii (circled)
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Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 34m 41.63641s[1]
Declination –20° 42′ 29.5779″[1]
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This page is a soft redirect. Apparent magnitude (V)

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Characteristics
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This page is a soft redirect. Spectral type

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This page is a soft redirect. F5 V[3]

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This page is a soft redirect. B−V color index

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This page is a soft redirect. +0.44[2]

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 Script error: No such module "convert". 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]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 2.2 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. 3.0 3.1 3.2 3.3 3.4 3.5 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/0603770, doi:10.1086/504637. 
  4. 4.0 4.1 4.2 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/0405198, 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. 6.0 6.1 "LTT 9081 -- High proper-motion Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-03. 
  7. 7.0 7.1 Lafrenière, David et al. (2007), "The Gemini Deep Planet Survey", The Astrophysical Journal 670 (2): 1367–1390, Bibcode:2007ApJ...670.1367L, arXiv:0705.4290, 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. 

External links