Delta Draconis

Delta Draconis, formally named Altais, is a yellow star in the constellation of Draco. It has an apparent visual magnitude of 3.0, making it easily visible to the naked eye. Based on parallax measurements obtained by the Gaia mission, it is approximately from the Sun.

Nomenclature

δ Draconis is the star's Bayer designation.
It bore the traditional names Aldib, Altais and Nodus Secundus. 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. 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. In 2016, the International Astronomical Union organized a Working Group on Star Names to catalogue and standardize proper names for stars. 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 Chinese, 天廚, 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. Consequently, the Chinese name for Delta Draconis itself is 天廚一.

Properties

Delta Draconis is a giant star with a stellar classification of G9 III. This indicates that it has exhausted the supply of hydrogen at its core and entered a later stage in its evolution. Around 1.7 billion years old, Delta Draconis has expanded to 10.5 times the Sun's radius and is radiating 59 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,873 K. At this temperature, it is giving off the yellow-hued glow of a G-type star. With a mass 1.7 times that of the Sun, this star will end its life as a white dwarf.

Pole star

Delta Draconis is the northern pole star of Ceres, lying 1.5 degrees from the true pole.