Lambda Aquilae

λ Aquilae
Location of λ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 06m 14.93898s[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 (Rv)−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]
Distance125 ± 4 ly
(38 ± 1 pc)
Absolute magnitude (MV)+0.54[6]
Details
Mass3.1±0.1[7] M☉
Radius2.27±0.13[4] R☉
Luminosity55[8] L☉
Surface gravity (log g)4.15±0.05[4] cgs
Temperature12,100±100[4] K
Metallicity [Fe/H]0.00[7] dex
Rotational velocity (v sin i)103[9] km/s
Age160+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
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ 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.
  5. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference apj736_2_89 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).