Lambda Aquilae
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Star λ Aquilae |
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| Aquila constellation | |||||||||||||||||
| AladinLite | |||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Eagle | ||||||||||||||||
| Right ascension | 19 h 06 m 14.9 s | ||||||||||||||||
| declination | -04 ° 52 ′ 57 ″ | ||||||||||||||||
| Apparent brightness | 3.43 likes | ||||||||||||||||
| Typing | |||||||||||||||||
| B − V color index | −0.09 | ||||||||||||||||
| U − B color index | −0.27 | ||||||||||||||||
| R − I index | −0.09 | ||||||||||||||||
| Spectral class | B9 Vn | ||||||||||||||||
| Astrometry | |||||||||||||||||
| Radial velocity | (−8.8 ± 0.9) km / s | ||||||||||||||||
| parallax | (26.37 ± 0.64) mas | ||||||||||||||||
| distance | (124 ± 3) ly (37.9 ± 0.9) pc |
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| Visual absolute brightness M vis | approx. +0.5 mag | ||||||||||||||||
| Proper movement | |||||||||||||||||
| Rec. Share: | (−18.69 ± 0.63) mas / a | ||||||||||||||||
| Dec. portion: | (−91.02 ± 0.44) mas / a | ||||||||||||||||
| Physical Properties | |||||||||||||||||
| Dimensions | 2.8 M ☉ | ||||||||||||||||
| radius | 2.3 R ☉ | ||||||||||||||||
| Luminosity |
84 L ☉ |
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| Effective temperature | 11500 K | ||||||||||||||||
| Rotation time | <21 hours | ||||||||||||||||
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Other names and catalog entries |
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λ Aquilae ( Lambda Aquilae , λ Aql) is a star in the constellation Eagle . He bears the proper name Al Thalimain Prior , while the star ι Aquilae (Iota Aquilae) is referred to as Al Thalimain Posterior . Al Thalimain (الثالمين, DMG aṯ-Ṯālimain ) is Arabic and means the (two) ostriches .
Lambda Aquila is a main sequence star belonging to the spectral class B9. The star is approximately 124 light years from Earth and has an apparent visual magnitude of 3.43 mag . It has about 2.8 times the mass, 2.3 times the radius and 84 times the luminosity of the sun, but rotates much faster than the sun once around its axis in less than 21 hours. Once its hydrogen supply in the nucleus is used up, it will go into the giant stage and finally end up as a white dwarf of 0.7 solar masses.
Web links
Al Thalimain Prior by Jim Kaler
Individual evidence
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ Estimation based on apparent brightness and distance