NationMaster - Encyclopedia: Hadar

Beta Centauri (β Cen / β Centauri), also known as Hadar or Agena, is the second brightest star in the constellation Centaurus and the eleventh brightest star in the nighttime sky. Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Centaurus (Latin for centaur) was one of the 48 constellations listed by Ptolemy, and counts also among the 88 modern constellations. ... By apparent magnitude Below the 100 Brightest stars as seen from Earth (by apparent magnitude at visible wavelengths) according to the Hipparcos sky survey. ...

Beta Centauri is a blue-white giant star that is approximately 525 light-years from the Solar system. A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Mosaic of the planets of the solar system, excluding Pluto, and including Earths Moon. ...

The name hadar comes from the Arabic word for "ground", while the name agena comes from Latin words for "the knee". Arabic (العربية) is a Semitic language, closely related to Hebrew and Aramaic. ... Latin is the language that was originally spoken in the region around Rome called Latium. ...

Categories: Star stubs | Bayer objects | Blue-white giants | Centaurus constellation 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. ... This article is about the star. ... 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. ... Radial velocity is the velocity of an object in the direction of the line of sight. ... The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real... 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. ... In physics, luminosity is the density of luminous intensity in a given direction. ...