Theta Aquilae

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**θ Aquilae**
Observation data Epoch J2000
Image:Theta Aquilae.jpg θ Aquilae
Constellation (pronunciation)	Aquila
Right ascension	20^h 11^m 18.2855^s
Declination	-00° 49′ 17.26″
Apparent magnitude (V)	3.242
Characteristics
Spectral type	B9.5III
U-B color index	-0.14
B-V color index	-0.07
Astrometry
Radial velocity (R_v)	-27.3 km/s
Proper motion (μ)	RA: 35.48 mas/yr Dec.: 6.05 mas/yr
Parallax (π)	11.36 ± 0.92 mas
Distance	290 ± 20 ly (88 ± 7 pc)
Absolute magnitude (M_V)	-3.197
Details
Mass	? M_☉
Radius	? R_☉
Luminosity	? L_☉
Temperature	? K
Metallicity	?
Rotation	?
Age	? years
Visual binary orbit
Companion	θ Aquilae B
Semimajor axis (a)	1"
Inclination (i)	44°
Visual binary orbit
Companion	θ Aquilae C
Period (P)	0.046883778234 yr
Semimajor axis (a)	113.7"
Inclination (i)	260°
Other designations
HD 191692, GC 28010, JP11 3180, TD1 26180, tet Aql, GCRV 12537, N30 4459, TYC 5161-2682-1, * 65 Aql, PLX 4790, UBV M 24576, AG-00° 2584, GSC 05161-02682, PMC 90-93 535, UBV 17389, BD-01° 3911, HGAM 861, PPM 180896, uvby98 100191692, BDS 9960 A, HIC 99473, ROT 2926, VDB 129, CCDM J20113-0049A, HIP 99473, SAO 144150, CSI-01° 3911 1, HR 7710, SBC7 790, FK5 756, IDS 20061-0107 A.
Database references
SIMBAD	data

Theta Aquilae (θ Aql / θ Aquilae) is a binary star in the constellation Aquila. It is approximately 287 light years from Earth. It also has the traditional name Tseen Foo, which is derived from the Mandarin 天桴 tiānfú meaning "the heavenly raft(er)," it may also mean drumsticks, with Altair, Beta Aquilae and Gamma Aquilae being the drum.

Theta Aquilae is a spectroscopic binary which is classified as a blue-white B-type giant with an apparent magnitude of +3.24. The binary has an orbital period of 17.1243 days.