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Star in the constellation Aquila From Wikipedia, the free encyclopedia
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]
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] |
Distance | 174.8 ± 0.9 ly (53.6 ± 0.3 pc) |
Absolute magnitude (MV) | +2.24[6] |
Details | |
Mass | 1.81±0.02[7] M☉ |
Luminosity | 10.5[6] L☉ |
Surface gravity (log g) | 4.21[2] cgs |
Temperature | 7,906[2] K |
Metallicity [Fe/H] | –0.05[2] dex |
Rotational velocity (v sin i) | 42[7] km/s |
Age | 180[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]