Altair

Altair in the constellation of Aquila.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aquila
Right ascension 19
Declination +08° 52′ 05.9563″
Apparent magnitude (V) 0.77
Characteristics
Spectral type A7 V
U−B color index +0.08
B−V color index +0.22
V−R color index 0.0
R−I color index +0.14
Variable type Delta Scuti
Astrometry
Radial velocity (Rv) −26.1 ± 0.9 km/s
Proper motion (μ) RA: +536.23 mas/yr
Parallax (π) 194.95 ± 0.57mas
Distance 16.73 ± 0.05 ly
(5.13 ± 0.01 pc)
Absolute magnitude (MV) 2.21
Details
Mass 1.79M
Radius 1.63 to 2.03R
Luminosity 10.6L
Surface gravity (log g) 4.29
Temperature 6,900 to 8,500K
Metallicity [Fe/H] −0.2dex
Rotation 8.9 hours
Rotational velocity (v sin i) 240 km/s
Age < 1Gyr
Other designations
Atair, α Aquilae, α Aql, Alpha Aquilae, Alpha Aql, 53 Aquilae, 53 Aql, BD+08°4236, FK5 745, GCTP 4665.00, GJ 768, HD 187642, HIP 97649, HR 7557, LFT 1499, LHS 3490, LTT 15795, NLTT 48314, SAO 125122, WDS 19508+0852A.
Database references
SIMBAD data

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Altair, which is released under the Creative Commons Attribution-Share-Alike License 3.0