NationMaster - Encyclopedia: Alpha Herculis

Alpha Herculis (α Her / α Herculis) is a star in the constellation Hercules. It also has the traditional name Ras Algethi or Rasalgethi, and the Flamsteed designation 64 Herculis. The Pleiades star cluster A star is any massive gaseous body in outer space. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Hercules is the fifth largest of the 88 modern constellations. ... Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. ...

There are two components, α¹ and α², and α¹ is a double star system with a primary massive red giant star and a closer companion. Double Star is a science fiction novel by Robert A. Heinlein. ... According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giants. Examples include Aldebaran and Arcturus. ... The Pleiades star cluster A star is any massive gaseous body in outer space. ...

The traditional name comes from Arabic Rasalgethi from Rās al-Jathi "head of the kneeling one". Arabic (Ø§Ù„Ø¹Ø±Ø¨ÙŠØ©) is a Semitic language, closely related to Hebrew and Aramaic. ...

Physical and other characteristics

Ras Algethi is the 4th largest star known to us, circa 720 times greater than the Sun. The Sun is the star at the centre of our Solar system. ...

Categories: Double stars | Hercules constellation | Bayer objects | Flamsteed objects Most stars are of nearly constant luminosity. ... Right ascension (RA; symbol Î±: 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. ... The parsec (symbol pc) is a unit of length used in astronomy. ... 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, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standardized distance away. ... To help compare different distances this page lists lengths starting at 109 m (1 million km). ... A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... To help compare distances at different orders of magnitude this page lists lengths starting at 1011 metres (100 million kilometres or 0. ... The astronomical unit (AU or au or a. ... (Redirected from 1 E30 kg) Categories: Orders of magnitude (mass) ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... It has been suggested that Law of universal gravitation be merged into this article or section. ... 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. ... // In General Physics In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given direction. ... The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ...

Physical and other characteristics GA_googleFillSlot("encyclopedia_square");

Physical and other characteristics