Zeta Aquilae

ζ Aquilae
Location of ζ Aquilae (circled)
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]
Distance83.0 ± 0.3 ly
(25.5 ± 0.1 pc)
Absolute magnitude (MV)+0.96[5]
Details
A
Mass2.37[6] M☉
Radius2.27[7] R☉
Luminosity39.4[7] L☉
Surface gravity (log g)4.17[8] cgs
Temperature9,620±20[7] K
Metallicity [Fe/H]−0.52±0.04[5] dex
Rotational velocity (v sin i)317[9] km/s
Age100±50[7] Myr
B
Mass0.50[10] M☉
Other designations
Okab (primary), Zeta Aql, ζ Aql, 17 Aql, BD+13 3899, FK5 716, GJ 4095, HD 177724, HIP 93747, HR 7235, SAO 104461, WDS J19054+1352A[11]
Database references
SIMBADdata

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]

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]

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  7. ^ a b c d Cite error: The named reference apj698_2_1068 was invoked but never defined (see the help page).
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  10. ^ a b Cite error: The named reference De_Rosa_et_al_2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Nakajima_Morino_2012 was invoked but never defined (see the help page).
  13. ^ "Naming Stars". IAU.org. Retrieved 18 June 2018.
  14. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).
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