Upsilon Aquilae

Not to be confused with U Andromedae.
Upsilon Aquilae
Location of υ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 45m 39.94732s[1]
Declination +07° 36′ 47.3626″[1]
Apparent magnitude (V) +5.889[2]
Characteristics
Spectral type A3 IV[3]
U−B color index +0.09[4]
B−V color index +0.18[4]
Astrometry
Radial velocity (Rv)−29.9±2.0[5] km/s
Proper motion (μ) RA: +53.492[1] mas/yr
Dec.: +0.021[1] mas/yr
Parallax (π)18.6614 ± 0.0975 mas[1]
Distance174.8 ± 0.9 ly
(53.6 ± 0.3 pc)
Absolute magnitude (MV)+2.24[6]
Details
Mass1.81±0.02[7] M☉
Luminosity10.5[6] L☉
Surface gravity (log g)4.21[2] cgs
Temperature7,906[2] K
Metallicity [Fe/H]–0.05[2] dex
Rotational velocity (v sin i)42[7] km/s
Age180[8] Myr
Other designations
υ Aql, 49 Aquilae, BD+07° 4210, HD 186689, HIP 97229, HR 7519, SAO 125032[9]
Database references
SIMBADdata

Upsilon Aquilae, Latinized from υ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. With an apparent visual magnitude of +5.91[4] it is a faint star but visible to the naked eye from suburban skies. It has an annual parallax shift of 18.66 mas,[1] indicating a distance of around 175 light-years (54 parsecs). The star is drifting closer with a radial velocity of –30 km/s.[5]

Upsilon Aquilae is a subgiant star with a stellar classification of A3 IV.[3] The outer atmosphere is radiating energy into space with 10.5[6] times the Sun's luminosity from its photosphere at an effective temperature of 7,906 K,[2] which gives it the white-hot glow of an A-type star. It is 180[8] million years old with 1.8 times the mass of the Sun and is spinning relatively quickly with a projected rotational velocity of 42 km/s.[7]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference aaa515_A11 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Zorec_Royer_2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference De_Rosa_et_al_2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).