Nu Aquilae

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Nu Aquilae
Diagram showing star positions and boundaries of the Aquila constellation and its surroundings
Cercle rouge 100%.svg

Location of ν Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 26m 31.09000s[1]
Declination +00° 20′ 18.8521″[1]
Apparent magnitude (V) 4.646[2]
Spectral type F3 Ib[3]
U−B color index +0.592[2]
B−V color index +0.593[2]
R−I color index 0.46
Radial velocity (Rv) –1.0[4] km/s
Proper motion (μ) RA: +0.57[1] mas/yr
Dec.: –2.31[1] mas/yr
Parallax (π) 1.15 ± 0.27[1] mas
Distance approx. 2,800 ly
(approx. 900 pc)
Absolute magnitude (MV) –5.0[3]
Mass 10.6[3] M
Radius 78[3] R
Luminosity 11,800[3] L
Temperature 6,900[3] K
Metallicity 7.47[3]
Rotational velocity (v sin i) 13[5] km/s
Age 15[3] Myr
Other designations
Equator Star, 32 Aql, BD+00 4206, HD 182835,HIP 95585, HR 7387, SAO 124628.[6]

Nu Aquilae (ν Aql, ν Aquilae) is the Bayer designation for a solitary[7] star in the constellation of Aquila and lies close to the celestial equator. It has an apparent visual magnitude of 4.646[2] and so is visible to the naked eye. Based upon an annual parallax shift of only 1.15 mas (with a 23% margin of error),[1] it is approximately 2,800 light-years (860 parsecs) from Earth.

The spectrum of this star matches a stellar classification of F3 Ib,[3] with the luminosity class of Ib indicating this is a supergiant. It has over twelve times the mass of the Sun and 78 times the Sun's radius. The outer atmosphere has an effective temperature of 6,900 K and it is radiating 11,800 times as much light as the Sun.[3] At this heat, it has the yellow-white hue of an F-type star.[8]


  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 d Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G. 
  3. ^ a b c d e f g h i j Lyubimkov, L. S.; et al. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 402 (2): 1369–1379. arXiv:0911.1335. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago 239 (1), Bibcode:1970CoAsi.239....1B. 
  6. ^ "32 Aql -- Star in double system", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-19. 
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  8. ^ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16 

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