Upsilon Aquilae
 Location of υ Aquilae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 45m 39.94763s[1] |
| Declination | +07° 36′ 47.3717″[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[5] km/s |
| Proper motion (μ) | RA: +54.10[1] mas/yr Dec.: +0.50[1] mas/yr |
| Parallax (π) | 18.65 ± 0.41[1] mas |
| Distance | 175 ± 4 ly (54 ± 1 pc) |
| Details | |
| 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[6] km/s |
| Other designations | |
Upsilon Aquilae (υ Aql, 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 18.65 milliarcsecond,[1] indicating a distance of around 175 light-years (54 parsecs).
Upsilon Aquilae is a subgiant star with a stellar classification of A3 IV.[3] The outer atmosphere is radiating energy into space at an effective temperature of 7,906 K,[2] which gives it the white-hot glow of an A-type star. It is spinning relatively quickly with a projected rotational velocity of 42 km/s.[6]
References
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