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Nu 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>–11.23[4] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: +94.12[1] mas/yr
Dec.: -14.62[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>20.47 ± 0.21[1]mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>159 ± 2 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>+0.93[5]</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>Mass</td><td>2.35[5] M</td></tr><tr style="vertical-align:baseline;"><td>Radius</td><td>8[4] R</td></tr><tr style="vertical-align:baseline;"><td>Luminosity</td><td>37[4] L</td></tr><tr style="vertical-align:baseline;"><td>Surface gravity (log g)</td><td>2.8[4] cgs</td></tr><tr style="vertical-align:baseline;"><td>Temperature</td><td>4,920[4] K</td></tr><tr style="vertical-align:baseline;"><td>Metallicity [Fe/H]</td><td>–0.15[4] dex</td></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>0.0[4] km/s</td></tr><tr style="vertical-align:baseline;"><td>Age</td><td>708[5] Myr</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">
Albulaan, 13 Aquarii, BD–11 5538, HD 201381, HIP 104459, HR 8093, SAO 164182.[6]

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Database references</th></tr><tr style="vertical-align: top;"><td>SIMBAD</td><td>data</tr>

Nu Aquarii <tr><td colspan="2" style="text-align:center;">

Location of ν Aquarii (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 09m 35.64888s[1]
Declination –11° 22′ 18.0851″[1]
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Nu Aquarii (ν Aqr, ν Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. It shares the traditional name Albulaan with μ Aquarii. The name derives from an Arabic term al-bulacān (ألبولعان) meaning "the two swallowers". This star, along with ε Aqr (Albali) and μ Aqr (Albulaan), were al Bulaʽ (البلع), the Swallower.[7][8][9]

In Chinese, 天壘城 (Tiān Lěi Chéng), meaning Celestial Ramparts, refers to an asterism consisting of ν Aquarii, ξ Aquarii, 46 Capricorni, 47 Capricorni, λ Capricorni, 50 Capricorni, 18 Aquarii, 29 Capricorni, 9 Aquarii, 8 Aquarii, 14 Aquarii, 17 Aquarii and 19 Aquarii.[10] Consequently, ν Aquarii itself is known as 天壘城十 (Tiān Lěi Chéng shí, English: the Tenth Star of Celestial Ramparts.)[11]

With an apparent visual magnitude of 4.52,[2] Nu Aquarii is visible to the naked eye. Its distance from Earth, as determined from parallax measurements, is around Script error: No such module "convert".. At an estimated age of 708 million years,[5] it has evolved into a giant star with a spectrum that matches a stellar classification of G8 III.[3] It has than double the mass of the Sun[5] and has expanded to eight[4] times the Sun's radius. Nu Aquarii is radiating 37-fold[4] the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,920 K.[4] At this heat, the star is glowing with the yellowish hue of a G-type star.[12]


  1. ^ a b c d e 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. ^ a b c d 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 Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram 4, Bibcode:1962MtSOM...4....1B. 
  4. ^ a b c d e f g h i j Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209. 
  5. ^ a b c d e Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, Bibcode:2008PASJ...60..781T, arXiv:0805.2434, doi:10.1093/pasj/60.4.781. 
  6. ^ "13 Aqr -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-02. 
  7. ^ Davis Jr., G. A. (October 1944), "The Pronunciations, Derivations, and Meanings of a Selected List of Star Names", Popular Astronomy 52 (3): 12, Bibcode:1944PA.....52....8D. 
  8. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc, p. 53, ISBN 0-486-21079-0, retrieved 2010-12-12. 
  9. ^ ε Aqr as Nir Saad Bula or Lucida Fortunæ Dissipantis (the brightest of luck of the swallower) and the common name is Albali. μ Aqr and ν Aqr was already designated as the common name Albulaan, the plural form of al Bulaʽ.
  10. ^ Invalid language code. 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  11. ^ Invalid language code. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 15 日
  12. ^ "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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