Magnitude 4.119 Apparent magnitude (V) 4.119 | Constellation Draco | |
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Similar Eta Draconis, Iota Draconis, Zeta Draconis, Struve 2398, Beta Draconis | ||
Theta Draconis (θ Dra / θ Draconis) is a fourth-magnitude star in the northern circumpolar constellation of Draco. Parallax measurements place it at an estimated distance of 68.6 light-years (21.0 parsecs) from Earth.
This star is 21% more massive than the Sun and has a radius 2.5 times the Sun's. It is radiating 8.7 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 6,290 K. This temperature is what gives it the yellow-white hue of an F-type main sequence star with a stellar classification of F9 V.
Chinese name
In Chinese, 紫微左垣 (Zǐ Wēi Zuǒ Yuán), meaning Left Wall of Purple Forbidden Enclosure, refers to an asterism consisting of θ Draconis, ι Draconis, η Draconis, ζ Draconis, υ Draconis, 73 Draconis, γ Cephei and 23 Cassiopeiae. Consequently, θ Draconis itself is known as 紫微左垣二 (Zǐ Wēi Zuǒ Yuán èr, English: the Second Star of Left Wall of Purple Forbidden Enclosure.), representing 上宰 (Shǎngzǎi), meaning The First Premier. 上宰 (Shǎngzǎi) is westernized into Shang Tsae by R.H. Allen with meaning "the Minor Steward" but it was for η Dra (Aldibain)