mardi 2 septembre 2008

Aquila 7


β Aquilae


Is a star in the constellation Aquila. It also has the traditional name Alshain from the Arabic term الشاهين aš-šāhīn "the (peregrine) falcon". This pseudo-Arabic name is derived from the Persian Šāhīn tarāzū (or possibly Šāhīn tara zed; see γ Aquilae), the Persian name for the asterism α, β and γ Aquilae. In Persian, Šāhīn means "royal falcon", "beam", and "pointer".
Beta Aquilae has magnitude 3.71 and is of spectral class G8IV. It is approximately 44.7 light years from Earth. It has a 12th magnitude companion, β Aquilae B, which is 13 arcseconds away on the sky.


γ Aquilae


Is a star in the constellation Aquila. It also has the traditional name Tarazed, which is derived from Persian term شاهين ترازو šāhin tarāzu meaning "the beam of the scale", referring to an asterism of α, β and γ Aquillae.
It has an apparent magnitude of 2.72 and is of spectral class K3. It is a giant star with a diameter of approximately half an AU, and its angular diameter can be detected and measured to be 0.0075 arcseconds. It is approximately 461 light years from Earth.


ε Aquilae


Is a triple star system in the constellation Aquila. It also has the traditional names Deneb el Okab, from an Arabic term ذنب العقاب ðanab al-cuqāb meaning "the tail of the falcon", and the Mandarin names Woo and Yuë, derived from 吳 wú, an old state near Jiangsu province, and 粵 yuè, an old state in Guandong province. It shares these names with ζ Aquilae.
The primary component, ε Aquilae A, is an orange K-type giant with an apparent magnitude of +4.02. It has two 10th companions separated from the primary by 131.1 and 148.6 arcseconds. Epsilon Aquilae is approximately 154 light years from Earth.


ζ Aquilae


Zeta is a triple star system in the constellation Aquila. It also has the traditional names Deneb el Okab, from an Arabic term ذنب العقاب ðanab al-cuqāb meaning "the tail of the falcon", and the Mandarin names Woo and Yuë, derived from 吳 wú, an old state near Jiangsu province, and 粵 yuè, an old state in Guandong province. It shares these names with ε Aquilae.



η Aquilae


Eta is a star in the constellation Aquila. It was also part of the former constellation Antinous. In addition, this star carries the seldom used Hebrew name Bezek or Bazak, meaning "lightning".
It is a Cepheid variable star, varying from apparent magnitude 3.6 to 4.4 with a period of 7.176641 days. Along with Delta Cephei, Zeta Geminorum and Beta Doradus, it is one of the most prominent naked eye Cepheids; that is, both the star itself and the variation in its brightness can be distinguished by the naked eye. Some other Cepheids such as Polaris are bright but have only a very small variation in brightness.
It is about 1200 light years from Earth. It is a yellow-white supergiant, and is about 3000 times more luminous than the Sun, with a diameter about 60 times that of the Sun.


θ Aquilae


Theta is a binary star in the constellation Aquila. It is approximately 287 light years from Earth. It also has the traditional name Tseen Foo, which is derived from the Mandarin 天桴 tiānfú meaning "the heavenly raft(er)," it may also mean drumsticks, with Altair, Beta Aquilae and Gamma Aquilae being the drum.
Theta Aquilae is a spectroscopic binary which is classified as a blue-white B-type giant with an apparent magnitude of +3.24. The binary has an orbital period of 17,1243 days.


ι Aquilae


Iota is a binary star in the constellation Aquila. It also has the traditional name Al Thalimain, which it shares with λ Aquilae. The name is derived from the Arabic term الثالمين ath-thalīmain meaning "The Two Ostriches".
Iota Aquilae is a blue-white B-type giant with an apparent magnitude of +4.36. It is approximately 307 light years from Earth.


λ Aquilae


Lambda is a star in the constellation Aquila. It also has the traditional name Al Thalimain, which it shares with ι Aquilae. The name is derived from the Arabic term الثالمين ath-thalīmain meaning "The Two Ostriches".
Lambda Aquilae is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.43. It is approximately 125 light years from Earth.

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