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Zeta Aquilae
Binary star in the constellation Aquila / From Wikipedia, the free encyclopedia
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Zeta Aquilae, or ζ Aquilae, is a binary star[10] system in the equatorial constellation of Aquila. It is readily visible with the naked eye, being of the third magnitude.[2] Based on parallax measurements obtained during the Hipparcos mission, it is approximately 83 light-years (25 parsecs) distant from the Sun.[1] It is a candidate member of the TW Hydrae association of co-moving stars.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 05m 24.60802s[1] |
Declination | +13° 51′ 48.5182″[1] |
Apparent magnitude (V) | 2.983[2] |
Characteristics | |
Spectral type | A0 Vn[3] |
U−B color index | +0.080[2] |
B−V color index | +0.009[2] |
Astrometry | |
Radial velocity (Rv) | −25[4] km/s |
Proper motion (μ) | RA: −0.25[1] mas/yr Dec.: –95.56[1] mas/yr |
Parallax (π) | 39.28 ± 0.16 mas[1] |
Distance | 83.0 ± 0.3 ly (25.5 ± 0.1 pc) |
Absolute magnitude (MV) | +0.96[5] |
Details | |
A | |
Mass | 2.37[6] M☉ |
Radius | 2.27[7] R☉ |
Luminosity | 39.4[7] L☉ |
Surface gravity (log g) | 4.17[8] cgs |
Temperature | 9,620±20[7] K |
Metallicity [Fe/H] | −0.52±0.04[5] dex |
Rotational velocity (v sin i) | 317[9] km/s |
Age | 100±50[7] Myr |
B | |
Mass | 0.50[10] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Zeta Aquilae's two components can be designated Zeta Aquilae A (officially named Okab /ˈoʊkæb/, the traditional name for the system)[13] and B. Zeta Aquilae has a number of companions listed and together they are designated WDS J19054+1352. As the primary star of this group, Zeta Aquilae also bears the designation WDS J19054+1352A.[11] The companions are then designated WDS J19054+1352B, C, D and E.[14][15][16][17]