Nu Aquilae

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ν Aquilae
Aquila constellation map.svg
Red circle.svg

Location of ν Aql (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) 4.72[2] + 9.6[3]
Characteristics
Spectral type F3 Ib[4] + A2[3]
U−B color index +0.60[2]
B−V color index +0.59[2]
Astrometry
Radial velocity (Rv) –2.30[5] 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[4]
Details
Mass 10.6[4] M
Radius 78[4] R
Luminosity 11,800[4] L
Temperature 6,900[4] K
Metallicity 7.47[4]
Rotational velocity (v sin i) 13[6] km/s
Age 15[4] Myr
Other designations
Equator Star,[citation needed] CCDM J19265+0021, WDS J19265+0020
A: 32 Aql, BD+00°4206, HD 182835,HIP 95585, HR 7387, SAO 124628, 2MASS J19263109+0020187
B: BD+00°4204, SAO 124623, 2MASS J19261836+0021184

Nu Aquilae (ν Aql, ν Aquilae) is the Bayer designation for a double star in the constellation of Aquila and lies close to the celestial equator. It has an apparent visual magnitude of 4.72 and so is visible to the naked eye.

The spectrum of ν Aql A matches a stellar classification of F3, 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. At this heat, it has the yellow-white hue of an F-type star.[7] Based upon an annual parallax shift of only 1.15 mas (with a 23% margin of error), it is approximately 2,800 light-years (860 parsecs) from Earth.

ν Aql B is a tenth magnitude star 220 arc-seconds distant. Little is known about it except an approximate spectral classification[8]

References[edit]

  1. ^ a b c d e 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 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ a b Roeser, S.; Bastian, U. (1988). "A new star catalogue of SAO type". Astronomy and Astrophysics Supplement Series (ISSN 0365-0138) 74: 449. Bibcode:1988A&AS...74..449R. 
  4. ^ a b c d e f g h 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. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ 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. 
  7. ^ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16 
  8. ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; Van Leeuwen, F.; Van Der Marel, H.; Mignard, F.; Murray, C. A.; Le Poole, R. S.; Schrijver, H.; Turon, C.; Arenou, F.; Froeschlé, M.; Petersen, C. S. (1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics 323 323. Bibcode:1997A&A...323L..49P. 

External links[edit]