: 190Īltair is a type-A main-sequence star with about 1.8 times the mass of the Sun and 11 times its luminosity. Physical characteristics Altair in comparison with the SunĪlong with β Aquilae and γ Aquilae, Altair forms the well-known line of stars sometimes referred to as the Family of Aquila or Shaft of Aquila. It is now so entered in the IAU Catalog of Star Names. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN, which included Altair for this star. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. It is an abbreviation of the Arabic phrase النسر الطائر Al-Nisr Al-Ta'ir, " the flying eagle". The traditional name Altair has been used since medieval times.
Α Aquilae ( Latinised to Alpha Aquilae) is the star's Bayer designation. Nomenclature Altair is the brightest star in the constellation Aquila Other interferometric studies with multiple telescopes, operating in the infrared, have imaged and confirmed this phenomenon. A study with the Palomar Testbed Interferometer revealed that Altair is not spherical, but is flattened at the poles due to its high rate of rotation. This is a significant fraction of the star's estimated breakup speed of 400 km/s. Īltair rotates rapidly, with a velocity at the equator of approximately 286 km/s. : 194 Altair is currently in the G-cloud-a nearby interstellar cloud, an accumulation of gas and dust. It is located at a distance of 16.7 light-years (5.1 parsecs) from the Sun. Altair is an A-type main-sequence star with an apparent visual magnitude of 0.77 and is one of the vertices of the Summer Triangle asterism the other two vertices are marked by Deneb and Vega. It has the Bayer designation Alpha Aquilae, which is Latinised from α Aquilae and abbreviated Alpha Aql or α Aql.
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