![]() 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 |