Acrab (also known as El Acrab or Graffias) is the proper name name of the star β Xi Scorpii 5 in the constellation of Scorpio. Acrab is actually a binary star. Both components of the system are hot B-class stars at least 10 times the mass of our own Sun, and will both have a short lifetime. In fact, both are expected to end their lives in a massive supernova. Acrab can be separated into its individual components by use of a small telescope. Acrab can be eclipsed by the moon and, very rarely, by planets. The last occultation of Akrab by a planet took place on 13 May1971, by Jupiter. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... A Julian epoch is an epoch that is based on Julian years of exactly 365. ... 2000 is a leap year starting on Saturday of the Gregorian calendar. ... Most stars are of nearly constant luminosity. ... 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. ... 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. ... 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, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ... In astronomy, the solar radius is a unit of length used to express the size of stars and larger objects such as galaxies. ... 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. ... The solar luminosity is a unit of luminosity (power emitted in the form of photons) conventionally used by astronomers to give the luminosities of stars. ... The historical temperature record shows the fluctuations of the temperature of the atmosphere and the oceans throughout history, and in particular since 1850. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... The Pleiades star cluster A star is any massive gaseous body in outer space just like the Sun. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... For the fictional alien character Scorpius from Farscape see Scorpius (Farscape). ... A binary star system consists of two stars both orbiting around their barycenter. ... A Sun is the star at the centre of a solar system. ... In astronomy, stellar evolution is the sequence of changes that a star undergoes during its lifetime, the millions or billions of years during which it emits light and heat. ... Remnant of Keplers Supernova, SN 1604. ... 50 cm refracting telescope at Nice Observatory. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... In Islam the occulation is the name given to the disappearance of the Twelfth Imam. ... May 13 is the 133rd day of the year in the Gregorian Calendar (134th in leap years). ... 1971 is a common year starting on Friday (click for link to calendar). ... Jupiter may refer to: Jupiter (god) – a Roman god Jupiter (planet) – a planet Jupiter Symphony – a symphony by Mozart, (Symphony No. ...
Acrab is dissolvable in telescopes starting from 5 centimeters of lensaperture, consisting of +4.2 likes bright star of the spectral class F5 and +7.3 likes bright star of the spectral class G7. The angle distance between both stars amounts to 7.7"and the position angle of the fainter component concerning the main star has the value 47 degrees. Grafias is distant 80 light-years from the earth. 50 cm refracting telescope at Nice Observatory. ... A lens is: a part of the eye an optical device that may be used in a camera or in a telescope; see lens (optics). ... In photography, the aperture defines the size of the opening in the lens, which in advanced cameras can be adjusted to control the amount of light reaching the film or digital sensor (CCD or CMOS). ...
1 5", 4 3"; cl. Hyades; T. Graffias, ex-Topa Topa, was built in 1943 by the Gulf Shipbuilding Corp., Chickasaw, Ala.; acquired by the Navy 19 February 1944, converted by the Bethlehem Steel Co., Baltimore, Md.; and commissioned at Baltimore 28 October 1944, Lt. Comdr.
Graffias reached Ominato, Honshu, 9 September, and after replenishing American bases at Wakayama, Nagasaki, and Sasebo, sailed for the States with home and discharge-bound passengers.
During the intensification of the Quemoy-Matsu situation in the summer of 1955, and thereafter, Graffias made frequent stops at Formosa to provision American and Chinese Nationalist forces as well as a beefed-up 7th Fleet.
Feeds |
Contact