Altair is a type-A main sequence star with approximately 1.8 times the mass of the Sun and 11 times its luminosity.[3][4] Altair possesses an extremely rapid rate of rotation; it has a rotational period of approximately 9 hours.[4] For comparison, the equator of the Sun requires just over 25 days for a complete rotation. This rapid rotation forces Altair to be oblate; its equatorial diameter is over 20 percent greater than its polar diameter.

Oblateness and surface temperature False-color image of the rapidly rotating star Altair, made with the MIRC imager on the CHARA array on Mt. Wilson.The angular diameter of Altair was measured interferometrically by R. Hanbury Brown and his coworkers at Narrabri Observatory in the 1960s. They found a diameter of 3 milliarcseconds.[13] Although Hanbury Brown et al. realized that Altair would be rotationally flattened, they had insufficient data to experimentally observe its oblateness. Altair was later observed to be flattened by infrared interferometric measurements made by the Palomar Testbed Interferometer in 1999 and 2000. This work was published by G. T. van Belle and his co-authors in 2001.[8]




the star system has five planets in addition to the dragon homeworld, though three of these are uninhabitable, one of the two, vedimer, is a moon of the dragon homeworld partly responsible for causing the Night of eternal darkness. the other is Casprion, a moon orbiting vadimer.
