Iota Aquilae

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**ι Aquilae**
Observation data Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19^h 36^m 43.2777^s
Declination	-01° 17′ 11.763″
Apparent magnitude (V)	4.349
Characteristics
Spectral type	B5III
U-B color index	-0.44
B-V color index	-0.08
R-I color index	-0.08
Astrometry
Radial velocity (R_v)	-21.4 km/s
Proper motion (μ)	RA: 1.89 mas/yr Dec.: -20.75 mas/yr
Parallax (π)	10.61 ± 0.94 mas
Distance	310 ± 30 ly (94 ± 8 pc)
Absolute magnitude (M_V)	-4.27
Details

Mass	4,3 M_☉
Radius	3,6 R_☉
Luminosity	445 L_☉
Temperature	14,000 K
Metallicity	?
Rotation	< 2,5 days
Age	? years

Orbit
Companion	ι Aquilae B
Semimajor axis (a)	47"
Inclination (i)	161°
Other designations
Al Thalimain, GCRV 12010, IDS 19315-0130 A, SAO 143597, 41 Aql, JP11 3120, ADS 12663 A, GSC 05144-03103, 2MASS J19364328-0117118, TD1 25035, AG-01° 2388, HD 184930, N30 4338, TYC 5144-3103-1, BD-01° 3782, HGAM 762, PLX 4599, UBV M 23925, CCDM J19367-0117A, HIC 96468, PMC 90-93 4736, UBV 16630, CSI-01° 3782 1, HIP 96468, PPM 180738, uvby98 100184930, GC 27103, HR 7447, ROT 2821, YZ 91 4928.
Database references
SIMBAD	data
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

Iota Aquilae (ι Aql / ι Aquilae) is a binary star in the constellation Aquila. It has the traditional name Al Thalimain, which it shares with λ Aquilae. The name is derived from the Arabic term الثالمين ath-thalīmain meaning "The Two Ostriches".

Iota Aquilae is a blue-white B-type star with an apparent magnitude of +4.36. Although it is listed in star catalogues as a giant star, calculations of its dimension show that in reality it is a dwarf.^[1] It is approximately 307 light years from Earth and has an optical companion with an apparent magnitude of +13,0 mag in a distance of 47,0".