Alpha Sagittarii (α Sgr / α Sagittarii) is a star in the constellation of Sagittarius. It also has the traditional name Rukbat, derived from the Arabic Ar-Rukbah = the knee. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... Jump to: navigation, search The J2000. ... Jump to: navigation, search Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Sagittarius ( , and Latin for Archer) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Jump to: navigation, search 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 subsequenly refined in terms of other characteristics. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... 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. ... The High Precision Parallax Collecting Satellite of the Hipparcos Space Astrometry Mission was a project of the European Space Agency (ESA) dedicated to the measurement of stellar parallax and the proper motions of stars. ... Jump to: navigation, search The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... Jump to: navigation, search Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Sagittarius ( , and Latin for Archer) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. ... Jump to: navigation, search Arabic (Arabic: العربية; transliterated: al-carabiyyah, less formally, عربي transliterated: carabÄ«) is the largest member of the Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew and Aramaic. ...

Rukbat is a blue, class B dwarf star. It is not particularly bright, with a magnitude of +3.96. In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ...

Fiction

In Anne McCaffrey's Dragonriders series, Rukbat is the star about which the planet of Pern orbits; its depiction in these novels differs in several ways from reality, most notably the star being depicted as yellow, class G. Jump to: navigation, search At the 63rd World Science Fiction Convention in Glasgow, August 2005 Anne Inez McCaffrey (born April 1, 1926) is an American science fiction author best known for her Dragonriders of Pern series. ... Jump to: navigation, search The Dragonriders of Pern books are written by Anne McCaffrey. ... Pern is a fictional planet in the universe created by science fiction writer Anne McCaffrey for her Dragonriders of Pern series of novels. ...