Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Draco
Right ascension
12h 47m 34.34473s[1]
Declination
+66° 47′ 25.0977″[1]
Apparent magnitude (V)
5.43[2]
Characteristics
Spectral type
K5 III[2]
B−V color index
1.567±0.006[2]
Astrometry
Radial velocity (Rv)
+11.33[3] km/s
Proper motion (μ)
RA: 6.674[1] mas/yr Dec.: −6.498[1] mas/yr
Parallax (π)
4.1601 ± 0.1056 mas[1]
Distance
780 ± 20 ly (240 ± 6 pc)
Absolute magnitude (MV)
−1.35[2]
Details
Radius
67[4]R☉
Luminosity
1,024.45[2]L☉
Temperature
3,945[5] K
Other designations
Tianyi, 7 Dra, BD+67°764, FK5 3020, HD 111335, HIP 62423, HR 4863, SAO 15902[3]
Database references
SIMBAD
data
7 Draconis, also named Tianyi/tiænˈjiː/,[6] is a single[7] star in the northern circumpolar constellation of Draco. It is visible to the naked eye as a faint orange-hued star with a stellar classification of 5.43.[2] Based upon an annual parallax shift of 4.16 mas as seen from the Earth,[1] the star is located approximately 780 light-years from the Sun.
This is an evolved giant star with a stellar classification of K5 III.[2] The measured angular diameter of this star, after correction for limb darkening, is 2.61±0.03 mas.[8] At its estimated distance, this yields a physical size of about 67 times the radius of the Sun.[4] It is radiating about 1,024[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,945 K.[5]
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^ abcdefghCite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ abCite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ abCite error: The named reference lang2006 was invoked but never defined (see the help page).
^ abCite error: The named reference McDonald2012 was invoked but never defined (see the help page).
^Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
^Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).
7Draconis, also named Tianyi /tiænˈjiː/, is a single star in the northern circumpolar constellation of Draco. It is visible to the naked eye as a faint...
Thuban (/ˈθjuːbæn/), with Bayer designation Alpha Draconis or α Draconis, is a binary star system in the northern constellation of Draco. A relatively...
Gamma Draconis (γ Draconis, abbreviated Gamma Dra, γ Dra), formally named Eltanin /ɛlˈteɪnɪn/, is a star in the northern constellation of Draco. Contrary...
Sigma Draconis is a single star in the northern constellation of Draco. It has the proper name Alsafi /ælˈseɪfi/, while Sigma Draconis, which is latinised...
Draconis for PC Reviews". Metacritic. CBS Interactive. Archived from the original on 30 April 2019. Retrieved 30 May 2019. "Divinity II: Ego Draconis...
Mu Draconis (μ Draconis, abbreviated Mu Dra, μ Dra) is a multiple star system near the head of the constellation of Draco. With a combined magnitude of...
Derivations (2nd rev. ed.). Cambridge, MA: Sky Publishing. ISBN 978-1-931559-44-7. Rumrill, H. B. (June 1936). "Star Name Pronunciation". Publications of the...
Iota Draconis (ι Draconis, abbreviated Iota Dra, ι Dra), also named Edasich /ˈɛdəsɪk/, is a star in the northern circumpolar constellation of Draco. A...
Beta Draconis, a name Latinized from β Draconis, is a binary star system and the third-brightest star in the northern circumpolar constellation of Draco...
Nu Draconis (also known as 𝜈 Dra, 𝜈 Draconis, where 𝜈 is the Greek letter nu, or traditionally as Kuma /ˈkjuːmə/) is a double star in the constellation...
pre-World War II China Tianyi UAV Tianyi, the proper name of the star 7Draconis Tianyi bao, A Chinese anarchist publication in Japan Luo Tianyi, Chinese...
Eta Draconis (η Draconis, abbreviated Eta Dra, η Dra) is a binary star in the northern circumpolar constellation of Draco. Despite having an apparent visual...
Zeta Draconis (ζ Draconis, abbreviated Zet Dra, ζ Dra) is a binary star in the northern circumpolar constellation of Draco. With an apparent visual magnitude...
BY Draconis is a multiple star system in the constellation Draco, consisting of at least three components. Components A and B are main sequence stars,...
frigid, ice covered planet unnamed in Dune 2000 but later called Sigma Draconis IV in Emperor: Battle for Dune. As they import their goods from nearby...
Draconis, Latinized from ε Draconis, is a fourth-magnitude star in the constellation Draco. This star along with Delta Draconis (Altais), Pi Draconis...
Delta Draconis (δ Draconis, abbreviated Delta Dra, δ Dra), formally named Altais /ælˈteɪ.ɪs/, is a yellow star in the constellation of Draco. It has an...
Theta Draconis, a name Latinized from θ Draconis, is a binary star system in the northern circumpolar constellation of Draco. It is faintly visible to...
Kappa Draconis, Latinized from κ Draconis, is a blue giant star located in the northern circumpolar constellation of Draco. At an apparent magnitude of...
Pictoris is the south pole star of Mercury while Omicron Draconis is its north star. 42 Draconis is the closest star to the north pole of Venus. Eta1 Doradus...
Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra) is a double or binary star in the northern circumpolar constellation of Draco. It has an apparent visual...
Psi1 Draconis (ψ1 Draconis, abbreviated Psi1 Dra, ψ1 Dra), also designated 31 Draconis, is a triple star system in the northern constellation of Draco...
CX Draconis is an interacting binary star system in the northern constellation of Draco, abbreviated CX Dra. It has the designation HD 174237 in the Henry...
adopted the name Tianyi for 7Draconis, an alternative identification of this star. The IAU has adopted the name Taiyi for 8 Draconis, an alternative identification...
Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar (/ˈdʒɔːzɑːr/ JAW-zar), is a solitary, orange-red star in the northern circumpolar...
(Sirius) and its northern shaft, if extended, would point to Draconis' center. Alpha Draconis might have "a cultic significance with Rer or Tuart, the Hippopotamus-goddess...
CM Draconis using eclipse minima timing". Astronomy and Astrophysics. 358: L5–L8. arXiv:astro-ph/0003391. Bibcode:2000A&A...358L...5D. "CM Draconis 3"...
broadcasting channel. In January 2010, Larian released Divinity II: Ego Draconis - the sequel to Divine Divinity - to the U.S. market on Xbox 360 and Windows...
velocity measurements of 42 Draconis were inconsistent with the proposed planetary orbit, casting serious doubt on 42 Draconis b's existence, but with a...
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