Zeta Aquilae

ζ Aquilae

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	19h 05m 24.6082s
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 (Rv)	-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 (MV)	3.016
Details
Mass	3,1 M☉
Radius	2,1 R☉
Luminosity	40 L☉
Temperature	7,500–10,000 K
Metallicity	?
Rotation	331 km/s (uncertain) (variable) 0,0088058738 Year
Age	? years
Orbit
Companion	ζ Aquilae B
Semi-major axis (a)	6.5″
Inclination (i)	60°
Orbit
Companion	ζ Aquilae C
Semi-major axis (a)	160.8″
Orbit
Companion	ζ Aquilae D
Semi-major axis (a)	202.3″
Inclination (i)	151°
Other designations
Deneb el Okab, 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
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

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.

The system is depicted in the computer game Descent II.

Location

Aquila Constellation

References

• HR 7235
• Image Zeta Aquilae

Components

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