Lambda Aquilae
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. It has an apparent visual magnitude of 3.43, 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.
| 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 | |
| Spectral type | B9Vn |
| U−B color index | −0.27 |
| B−V color index | −0.09 |
| 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 −0.1 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 55 L☉ |
| Surface gravity (log g) | 4.31 cgs |
| Temperature | 11780 K |
| Metallicity [Fe/H] | 0.00 dex |
| Rotational velocity (v sin i) | 103 km/s |
| Age | 160+20 −20 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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