Lambda Aquilae information

λ Aquilae
	Location of λ Aquilae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19h 06m 14.93898s
Declination	−04° 52′ 57.2007″
Apparent magnitude (V)	3.43
Characteristics
Evolutionary stage	main-sequence
Spectral type	B9Vn
U−B color index	−0.27
B−V color index	−0.048
Astrometry
Radial velocity (Rv)	−12.0 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)	+0.54
Details
Mass	3.1±0.1 M☉
Radius	2.27±0.13 R☉
Luminosity	55 L☉
Surface gravity (log g)	4.15±0.05 cgs
Temperature	12,100±100 K
Metallicity [Fe/H]	0.00 dex
Rotational velocity (v sin i)	103 km/s
Age	160+20; −20 Myr
Other designations
	λ Aql, 16 Aql, BD−05°4876, FK5 717, HD 177756, HIP 93805, HR 7236, SAO 143021.
Database references
SIMBAD	data

Lambda Aquilae, Latinized from λ Aquilae, is a star in the constellation Aquila. It has the traditional name Al Thalimain /ælˌθælɪˈmeɪn/, which it shares with ι Aquilae. The name is derived from the Arabic الظلیمين al-ẓalīmayn "the two ostriches". Lambda Aquilae is more precisely Al Thalimain Prior.^{[citation needed]} It has an apparent visual magnitude of 3.43,^[2] which is bright enough to be seen with the naked eye. Parallax measurements place it at a distance of about 125 light-years (38 parsecs) from Earth.^[1]

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^ ^a ^b ^c ^d Gordon, Kathryn D.; Gies, Douglas R.; Schaefer, Gail H.; Huber, Daniel; Ireland, Michael (2019). "Angular Sizes, Radii, and Effective Temperatures of B-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal. 873 (1): 91. Bibcode:2019ApJ...873...91G. doi:10.3847/1538-4357/ab04b2. S2CID 125181833.
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[gordon2019-4] Gordon, Kathryn D.; Gies, Douglas R.; Schaefer, Gail H.; Huber, Daniel; Ireland, Michael (2019). "Angular Sizes, Radii, and Effective Temperatures of B-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal. 873 (1): 91. Bibcode:2019ApJ...873...91G. doi:10.3847/1538-4357/ab04b2. S2CID 125181833.

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[SIMBAD-10] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Location of λ Aquilae (circled)
Constellation	Aquila
Right ascension	19^h 06^m 14.93898^s^[1]
Declination	−04° 52′ 57.2007″^[1]
Apparent magnitude (V)	3.43^[2]
Characteristics
Evolutionary stage	main-sequence
Spectral type	B9Vn^[3]
U−B color index	−0.27^[2]
B−V color index	−0.048^[4]
Astrometry

Radial velocity (R_v)	−12.0^[5] km/s
Proper motion (μ)	RA: −19.68^[1] mas/yr Dec.: −90.37^[1] mas/yr
Parallax (π)	26.05 ± 0.81 mas^[1]
Distance	125 ± 4 ly (38 ± 1 pc)
Absolute magnitude (M_V)	+0.54^[6]

Details

Mass	3.1±0.1^[7] `M`_☉
Radius	2.27±0.13^[4] `R`_☉
Luminosity	55^[8] `L`_☉
Surface gravity (log g)	4.15±0.05^[4] cgs
Temperature	12,100±100^[4] K
Metallicity [Fe/H]	0.00^[7] dex
Rotational velocity (v sin i)	103^[9] km/s
Age	160+20 −20^[7] Myr

Other designations
λ Aql, 16 Aql, BD−05°4876, FK5 717, HD 177756, HIP 93805, HR 7236, SAO 143021.^[10]
Database references
SIMBAD	data

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