Theta Draconis
Encyclopedia
Theta Draconis (θ Dra / θ Draconis) is a fourth-magnitude star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Draco
Draco (constellation)
Draco is a constellation in the far northern sky. Its name is Latin for dragon. Draco is circumpolar for many observers in the northern hemisphere...
.
Chinese name
In ChineseChinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Left Wall of Purple Forbidden Enclosure
Purple Forbidden enclosure
The Purple Forbidden enclosure is one of the San Yuan or Three enclosures. Stars and constellations of this group lie near the north celestial pole and visible all year from temperate latitudes in the Northern Hemisphere.-Asterisms:The asterisms are :...
, refers to an asterism consisting of θ Draconis, ι Draconis
Iota Draconis
Iota Draconis is an orange giant star located away in the constellation Draco. A visually unremarkable star of apparent magnitude 3.31, it has recently been discovered to have a planet.-Name:...
, η Draconis
Eta Draconis
Eta Draconis is a star in the constellation Draco. Eta Draconis has apparent magnitude +2.73 and is a yellow giant variable star belonging to spectral class G8III. The luminosity of Eta Draconis is neary 50 times that of the Sun...
, ζ Draconis
Zeta Draconis
Zeta Draconis is a star in the constellation Draco. It shares the Arabic name Al dhi'bah with several other stars in the constellation, and, together with Eta Draconis, it also shares the name Al dhibain...
, υ Draconis, 73 Draconis, γ Cephei
Gamma Cephei
Gamma Cephei , traditionally named Errai, Er Rai, and or Alrai, is a binary star system approximately 45 light-years away in the constellation of Cepheus. Gamma Cephei contains an apparent magnitude of 3.22. The visible part of the system is a stellar class K1III-IV orange subgiant star on its...
and 23 Cassiopeiae. Consequently, θ Draconis itself is known as , representing , 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
Eta Draconis
Eta Draconis is a star in the constellation Draco. Eta Draconis has apparent magnitude +2.73 and is a yellow giant variable star belonging to spectral class G8III. The luminosity of Eta Draconis is neary 50 times that of the Sun...
(Aldibain)
See also
- Lists of stars in the constellation Draco
- Class F Stars
- Subgiant starSubgiant starA subgiant star is a star that is slightly brighter than a normal main-sequence star of the same spectral class, but not as bright as true giant stars...
- Star systemStar systemA star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
External links
- Jim Kaler's Stars, University of Illinois: THETA DRA (Theta Draconis)
- An Atlas of the Universe: Multiple Star Orbits