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Beta Aquilae
Triple star system in the constellation Aquila / From Wikipedia, the free encyclopedia
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Beta Aquilae, Latinized from β Aquilae, is a triple star[12] system in the equatorial constellation of Aquila. It is visible to the naked eye as a point-like source with an apparent visual magnitude of 3.87.[2] Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 44.7 light-years from the Sun.[1] It is drifting closer to the Sun with a radial velocity of −40 km/s.[6]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 55m 18.79256s[1] |
Declination | +06° 24′ 24.3425″[1] |
Apparent magnitude (V) | 3.87 + 12.0[2] |
Characteristics | |
Spectral type | G9.5 IV[3] + M2.5 V[4] |
U−B color index | 0.48[5] |
B−V color index | 0.86[5] |
R−I color index | 0.49 |
Variable type | Suspected |
Astrometry | |
Radial velocity (Rv) | −40.3±0.09[6] km/s |
Proper motion (μ) | RA: 45.27[1] mas/yr Dec.: −481.91[1] mas/yr |
Parallax (π) | 73.00 ± 0.20 mas[1] |
Distance | 44.7 ± 0.1 ly (13.70 ± 0.04 pc) |
Absolute magnitude (MV) | +3.03[7] |
Details[8] | |
A | |
Mass | 1.26±0.18[9] M☉ |
Radius | 3.064±0.020 R☉ |
Luminosity | 5.60±0.17 L☉ |
Surface gravity (log g) | 3.54±0.14 cgs |
Temperature | 5,071±37 K |
Metallicity [Fe/H] | −0.19±0.05 dex |
Rotation | 5.08697±0.00031 d[10] |
Rotational velocity (v sin i) | 22.28 km/s |
Age | 9.6–11.4[11] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
Close
Its two components are designated Beta Aquilae A (formally named Alshain /ælˈʃeɪn/, the traditional name for the system)[13][14] and B.