Epsilon Aquilae

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**ε Aquilae**
Observation data Epoch J2000
Image:Epsilon Aquilae.jpg ε Aquilae
Constellation (pronunciation)	Aquila
Right ascension	18^h 59^m 37.3574^s
Declination	+15° 04′ 05.873″
Apparent magnitude (V)	4.025
Characteristics
Spectral type	K1III
U-B color index	1.04
B-V color index	1.08
Astrometry
Radial velocity (R_v)	-48 km/s
Proper motion (μ)	RA: -52.68 mas/yr Dec.: -73.81 mas/yr
Parallax (π)	21.22 ± 0.77 mas
Distance	154 ± 6 ly (47 ± 2 pc)
Absolute magnitude (M_V)	5.091
Details
Mass	? M_☉
Radius	? R_☉
Luminosity	? L_☉
Temperature	? K
Metallicity	?
Rotation	?
Age	? years
Visual binary orbit
Companion	ε Aquilae B
Semimajor axis (a)	130.5"
Inclination (i)	186°
Visual binary orbit
Companion	ε Aquilae C
Semimajor axis (a)	148.6"
Inclination (i)	163°
Other designations
Deneb el Okab, eps Aql, N30 4216, TYC 1585-2531-1, 13 Aql, GSC 01585-02531, PLX 4406, UBV M 23382, AG+14° 1954, HD 176411, PMC 90-93 506, UBV 16127, BD+14° 3736, HIC 93244, PPM 135586, YZ 14° 6948, CCDM J18596+1503A, HIP 93244, ROT 2699, YZ 0 1750, CSI+14° 3736 1, HR 7176, SAO 104318, IDS 18551+1456 A, GC 26091, IRC +10392, SRS 30712, GCRV 11441, JP11 3058, TD1 23660.
Database references
SIMBAD	data

Epsilon Aquilae or (Deneb el Okab) (ε Aql / ε 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 ζ Aquilae.

The primary component, ε Aquilae A, is an orange K-type giant with an apparent magnitude of +4.02. It has two 10th companions separated from the primary by 131.1 and 148.6 arcseconds. Epsilon Aquilae is approximately 154 light years from Earth.