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Lambda Aquilae: Wikis


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λ Aquilae
Aquila constellation map.png
Lambda Aquilae is located at the tail of the constellation in the lower right.
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 06m 14.9384s
Declination -04° 52′ 57.195″
Apparent magnitude (V) 3.427
Spectral type B9Vn
U-B color index -0.27
B-V color index -0.09
R-I color index -0.09
Radial velocity (Rv) -12 km/s
Proper motion (μ) RA: -19.68 mas/yr
Dec.: -90.37 mas/yr
Parallax (π) 26.05 ± 0.81 mas
Distance 125 ± 4 ly
(38 ± 1 pc)
Absolute magnitude (MV) 0.51
Mass 2.8 M
Radius 2.3 R
Luminosity 84 L
Temperature 11,500 K
Metallicity ?
Rotation < 21 hours
0,00552 Year
Age ? years
Other designations
16 Aql, HD 177756, BD-05° 4876, FK5 717, HIP 93805, HR 7236, SAO 143021.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Lambda Aquilae (λ Aql / λ Aquilae) is a star in the constellation Aquila. It has the traditional name Al Thalimain, which it shares with ι Aquilae. The name is derived from the Arabic الثالمين al-thalīmain "the two ostriches". Lambda Aquilae is more precisely Al Thalimain Prior.

Lambda Aquilae is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.43. It is approximately 125 light years from Earth.



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