Nu Aquilae

ν Aquilae
Location of ν Aql (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 26m 31.08926s[1]
Declination +00° 20′ 18.8549″[1]
Apparent magnitude (V) 4.72[2] + 9.6[3]
Characteristics
Spectral type F3 Ib[4] + A1 IV/V[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: −0.562[1] mas/yr
Dec.: −2.294[1] mas/yr
Parallax (π)0.8752 ± 0.0869 mas[1]
Distance3,700 ± 400 ly
(1,100 ± 100 pc)
Absolute magnitude (MV)−5.58[6]
Details
Mass12.5[4] M☉
Radius71.20+14.45
−10.23[7] R☉
Luminosity7,645±1,464[7] L☉
Surface gravity (log g)1.43[4] cgs
Temperature6,396+516
−564[7] K
Metallicity [Fe/H]−0.03[8] dex
Rotational velocity (v sin i)13[9] km/s
Age15[4] Myr
Other designations
ν Aql, CCDM J19265+0021, WDS J19265+0020, 2MASS J19460427+1145429, Gaia EDR3 4304445468512687744
ν Aql A: 32 Aql, BD+00° 4206, HD 182835, HIP 95585, HR 7387, SAO 124628
ν Aql B: BD+00° 4204, SAO 124623
Database references
SIMBADdata

Nu Aquilae, Latinized from ν Aquilae, is the Bayer designation for a double star in the constellation of Aquila that lies close to the celestial equator. It has an apparent visual magnitude of 4.72 and so is visible to the naked eye. Based upon an annual parallax shift of only 0.8752 mas (with a 10% margin of error), it is believed to lie approximately 3,700 light-years (1,100 parsecs) from Earth.[1] The variable star NU Aquilae has a similar-looking designation but is a separate and unrelated object.

The spectrum of ν Aql A matches a stellar classification of F3, with the luminosity class of Ib indicating this is a supergiant. This is a massive star, with approximately 12.5 times the mass of the sun,[4] and it spans ~71 times the Sun's girth.[7] It is only 15[4] million years old and is radiating around 7,600 times the luminosity of the Sun.[7] The outer atmosphere has an effective temperature of 6,700 K and it has the yellow-white hue of an F-type star.[10]

ν Aql B is a ninth magnitude star 201 arc-seconds distant.[11] Little is known about it except an approximate spectral classification.[3]

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference burnichon was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference fundamental was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference kovtyukh was invoked but never defined (see the help page).
  7. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  8. ^ Cite error: The named reference lyubimkov was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference coapa239_1 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mason_et_al_2001 was invoked but never defined (see the help page).