Theta Aquilae

370 L ☉

Theta Aquilae ( θ Aql ) is the fourth brightest star in the constellation Aquila. In Mandarin it leads to the classical proper names Tseen Foo (ie " celestial raft "). It has an apparent magnitude of 3.24 may, about 290 light years from Earth and has the spectral type B9.5. Therefore, it appears bluish white.

Theta Aquilae is incorrectly classified as giant because its luminosity actually comes from two very close, inseparable stars: He is a spectroscopic binary whose components have an orbital period of 17.123 days and an average distance of 0.24 AU. The orbit is eccentric relative. Although telescopes to resolve the double star is not sufficient, this may very well happen by interferometry. Both components are B9 star, of which the main star but is more massive and brighter. He is a 3.47 like brighter subgiant with 3.7 times the mass, the 5.5 times the diameter and the 370fachen luminosity of the sun, while the companion is a 5.0 like bright main sequence star with 2.8 times the mass, the 2.7 times the radius and 90 times the luminosity of the sun is. The main component is a metal-rich rating, so has a relatively high content of heavy elements on. At a distance of 113.7 " of Theta Aquilae, a 13.0 is like a bright star, but this is probably just a visual (ie not gravitationally bound ) companion. Probably Theta Aquilae is embedded in a large reflection nebula.