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A blue-white star, which is quite good visible in summer on the northern hemisphere. Altair is one of the fastest rotating stars we know of. In 6.5 hours it rotates once. The smaller Sun needs 600 hours for this. Due to its fast rotation Altair ist strongly oblate on its poles.

Constellation: Aquila
Age: < 1 billion years
Distance: 16.77 light-years
Spectral class: A7
Visual magnitude: 0.77
Luminosity: 11.39 * Sun
Mass: 2 * Sun
Diameter: 1.631 * Sun
Radial velocity: -26.1 km/sec

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Graphic: Zina Deretsky, National Science Foundation

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