Zeta Aquilae

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**ζ Aquilae**
Observation data Epoch J2000
Image:Zeta Aquilae.jpg ζ Aquilae
Constellation (pronunciation)	Aquila
Right ascension	19^h 05^m 24.6082^s
Declination	+13° 51′ 48.521″
Apparent magnitude (V)	2.988
Characteristics
Spectral type	A0Vn
U-B color index	-0.01
B-V color index	0.01
Astrometry
Radial velocity (R_v)	-25 km/s
Proper motion (μ)	RA: -7.04 mas/yr Dec.: -95.31 mas/yr
Parallax (π)	39.18 ± 0.72 mas
Distance	83 ± 2 ly (25.5 ± 0.5 pc)
Absolute magnitude (M_V)	3.016
Details
Mass	3–4 M_☉
Radius	130 R_☉
Luminosity	1,900 L_☉
Temperature	3,350 K
Metallicity	?
Rotation	?
Age	? years
Visual binary orbit
Companion	ζ Aquilae B
Semimajor axis (a)	6.5"
Inclination (i)	60°
Visual binary orbit
Companion	ζ Aquilae C
Semimajor axis (a)	160.8"
Visual binary orbit
Companion	ζ Aquilae D
Semimajor axis (a)	202.3"
Inclination (i)	151°
Other designations
* zet Aql, GC 26270, HR 7235, SAO 104461, * 17 Aql, GCRV 11547, IDS 19008+1343 A, ADS 12026 A, IRC +10404, SRS 30716, AG+13° 1887, GJ 4095, JP11 3072, TD1 23865, BD+13° 3899, GSC 01052-03027, N30 4228, TYC 1052-3027-1, CCDM J19055+1352A, HD 177724, PLX 4436, UBV M 23478, CSI+13° 3899 1, HGAM 730, PMC 90-93 509, UBV 16191, EUVE J1905+13.8, HIC 93747, PPM 135773, uvby98 100177724 AB, FK5 716, HIP 93747, ROT 2719.
Database references
SIMBAD	data

Zeta Aquilae (ζ Aql / ζ Aquilae) is a triple star system in the constellation Aquila. It also has the traditional names Deneb el Okab, from an Arabic term ذنب العقاب ðanab al-^cuqāb meaning "the tail of the falcon", and the Mandarin names Woo and Yuë, derived from 吳 wú, an old state near Jiangsu province, and 粵 yuè, an old state in Guandong province. It shares these names with ε Aquilae.

The primary component, ζ Aquilae A, is a white A-type main sequence dwarf with an apparent magnitude of +2.99. It has two 12th magnitude companions at 6.5 and 158.6 arcseconds from the primary. Zeta Aquilae is approximately 83.2 light years from Earth.

[edit] Components

NAME	Right ascension	Declination	Apparent magnitude (V)	Database references
ζ Aquilae B (BD+13 3899B)	01^h 09^m 42.2^s	+35° 36' 54	14.4	Simbad
ζ Aquilae C (BD+13 3899C)	01^h 09^m 35.334^s	+35° 36' 24.4	12.9	Simbad
ζ Aquilae D				Simbad