Eta Aquilae (η Aql / η Aquilae) 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". From the Glossary of Astronomical Terms by the Harvard-Smithsonian Center for Astrophysics: Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. ... It has been suggested that this article or section be merged into Julian epoch. ... This article or section does not cite its references or sources. ... Aquila (IPA: , Latin: ; sometimes named the Vulture), is one of the 48 constellations listed by Ptolemy, also mentioned by Eudoxus (4th cent. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... This article is in need of attention from an expert on the subject. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Fifth Fundamental Catalogue is a glossary of positions of stars. ... The Hipparcos and Tycho Catalogues (Tycho-1) are the primary products of the European Space Agencys astrometric mission, Hipparcos. ... In astronomy, many stars are referred to simply by catalogue numbers. ... This article is about the astronomical object. ... This article or section does not cite its references or sources. ... Aquila (IPA: , Latin: ; sometimes named the Vulture), is one of the 48 constellations listed by Ptolemy, also mentioned by Eudoxus (4th cent. ... Antinous was a constellation south of Aquila. ... Hebrew redirects here. ...

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. Cepheid in the Spiral Galaxy M100 A Cepheid variable or Cepheid is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute luminosity. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... Delta Cephei (δ Cep / δ Cephei) is a star in the constellation Cepheus. ... Zeta Geminorum (ζ Gem / ζ Geminorum) is a star in the constellation Gemini. ... The naked eye is a figure of speech referring to human visual perception that is unaided by enhancing equipment, such as a telescope or binoculars. ... Polaris (α UMi / α Ursae Minoris / Alpha Ursae Minoris), more commonly known as The North Star or simply North Star, is the brightest star in the constellation Ursa Minor. ...

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. A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... Supergiants are the most massive stars. ... The Sun is the star at the center of the Solar System. ...

Location

The star's location in the constellation of Aquila is shown in the following map:

This is a celestial map of the constellation Aquila the Eagle. ... This is a celestial map of the constellation Aquila the Eagle. ...

References

• HD 187929 -- Classical Cepheid (Delta Cep Type). SIMBAD Astronomical Database. Retrieved on 2007-01-21.

2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the Anno Domini (common) era. ... January 21 is the 21st day of the year in the Gregorian calendar. ...

External links

• Yale Bright Star Catalog; click on Aquila