Nu Aquilae, Latinized from ν Aquilae, is the

Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. ...

for a

double star In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes. This occurs because the pair either forms a binary star (i.e. a bi ...

in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Aquila Aquila may refer to: Arts, entertainment, and media * ''Aquila'', a series of books by S.P. Somtow * ''Aquila'', a 1997 book by Andrew Norriss * ''Aquila'' (children's magazine), a UK-based children's magazine * ''Aquila'' (journal), an or ...

that lies close to the celestial equator. It has an apparent visual magnitude of 4.72 and so is visible to the naked eye. Based upon an annual

parallax Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects ...

shift of only (with a 10% margin of error), it is believed to lie approximately from Earth. The variable star NU Aquilae has a similar-looking designation but is a separate and unrelated object. The spectrum of ν Aql A matches a

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...

of F3, with the luminosity class of Ib indicating this is a supergiant. This is a massive star, with approximately 12.5 times the mass of the sun, and it spans 108 times the Sun's size. It is only 15 million years old and is radiating around 9,800 times the luminosity of the Sun. The outer atmosphere has an

effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ...

of 5,500 K and it has the yellow-white hue of an F-type star. ν Aql B is a ninth magnitude star 201 arc-seconds distant. Little is known about it except an approximate spectral classification.

References

External links

*
Image ν Aquilae

HR 7387

CCDM 19265+0021
{{DEFAULTSORT:Nu Aquilae F-type supergiants A-type main-sequence stars A-type subgiants Double stars Aquila (constellation) J19460427+1145429 Aquilae, Nu Durchmusterung objects Aquilae, 32 182835 095585 7387