7 Draconis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 12h 47m 34.3489s[1] |
| Declination | +66° 47′ 25.086″[1] |
| Characteristics | |
| Spectral type | K5III[1] |
| Astrometry | |
| Radial velocity (Rv) | +11.33[1] km/s |
| Parallax (π) | 4.40 ± 0.22 mas[1] |
| Distance | 740 ± 40 ly (230 ± 10 pc) |
| Details | |
| Other designations | |
| Database references | |
| SIMBAD | data |
7 Draconis (abbreviated 7 Dra), also named Tianyi,[2] is a star in the northern circumpolar constellation of Draco. Based upon an annual parallax shift of 4.40 mas as seen from the Earth,[1] the star is located approximately 740 light-years from the Sun.
Nomenclature
7 Draconis is the star's Flamsteed designation.
The star bore the traditional Chinese name of Tianyi.[3] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[4] to catalogue and standardize proper names for stars. The WGSN approved the name Tianyi for this star on 30 June 2017 and it is now so entered on the List of IAU-approved Star Names.[2]
References
- ^ a b c d e f g "7 Dra -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2018-01-16.
- ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
- ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 7. Retrieved 2018-07-14.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2018-01-16.
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