![]() The Cambridge guide to the constellations. Contributi Osservatorio Astronomico di Padova in Asiago. "A catalogue of stellar rotational velocities". I - Stellar atmosphere parameters and abundances". "High-resolution spectroscopic survey of 671 GK giants. ^ a b c d McWilliam, Andrew (December 1990)."Using Optical Observations to find the Diameter of HT Cas". See: Lochner, Jim Gibb, Meredith Newman, Phil (January 30, 2006). Stellar diameter = 1 AU × angular diameter/parallax = 3.37/32.54 AU = 0.10 AU = 22 R ☉. ^ a b The Sun has a radius of 0.004652 AU.Washington: Carnegie Institution of Washington. "General Catalogue of Stellar Radial Velocities". "The Spectra of the Bright Stars of Types F5-K5". Communications of the Lunar and Planetary Laboratory. "UBVRIJKL photometry of the bright stars". Pole star ĭelta Draconis is the northern pole star of Ceres, lying 1.5 degrees from the true pole. With a mass 2.32 times that of the Sun, this star will end its life as a white dwarf. At this temperature, it is giving off the yellow-hued glow of a G-type star. It is radiating 59 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,820 K. At a parallax of 32.54 mas, this corresponds to a physical radius equal to 11 times the solar radius. The angular diameter of the star is estimated as 3.37 ± 0.06 mas. This indicates that, at an estimated age of 800 million years, it has exhausted the supply of hydrogen at its core and entered a later stage in its evolution. Properties ĭelta Draconis is a giant star with a stellar classification of G9 III. Consequently, the Chinese name for Delta Draconis itself is 天廚一 ( Tiān Chú yī, English: the First Star of Celestial Kitchen). In Chinese, 天廚 ( Tiān Chú, Tien Choo), meaning Celestial Kitchen or Heaven's Kitchen, refers to an asterism consisting of Delta Draconis, Sigma Draconis, Epsilon Draconis, Rho Draconis, 64 Draconis and Pi Draconis. The WGSN approved the name Altais for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names. ![]() In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. According to a 1971 NASA catalog of stars, Al Tāis or Tais were the title for three stars : Delta Draconis as Altais, Pi Draconis as Tais I and Rho Draconis as Tais II (exclude Epsilon Draconis). The title Altais was derived from Arabic Al Tāis "the Goat", the association of this star, along with Pi Draconis, Rho Draconis and Epsilon Draconis (Tyl). It bore the traditional names Aldib, Altais (the goat) and Nodus Secundus. Δ Draconis ( Latinised to Delta Draconis) is the star's Bayer designation.
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