Phi Draconis
From Infogalactic: the planetary knowledge core
 Location of φ Draconis (next to χ Dra). |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 18h 20m 45.4304s[1] |
| Declination | 71° 20′ 16.132″[1] |
| Apparent magnitude (V) | 4.2004[2] |
| Characteristics | |
| Spectral type | A0sp[1] |
| U−B color index | -0.38[3] |
| B−V color index | -0.10[3] |
| Variable type | α² CVn[4] |
| Astrometry | |
| Radial velocity (Rv) | -16 [1] km/s |
| Proper motion (μ) | RA: -5.03[2] mas/yr Dec.: 37.86[2] mas/yr |
| Parallax (π) | 10.77 ± 0.38[2] mas |
| Distance | 300 ± 10 ly (93 ± 3 pc) |
| Absolute magnitude (MV) | +0.21[5] |
| Details | |
| Mass | 2.99 ± 0.10[5] M☉ |
| Radius | 2.7 ± 0.2[5] R☉ |
| Luminosity | 107[5] L☉ |
| Surface gravity (log g) | 4.21 ± 0.08[5] cgs |
| Temperature | 11,429[5] K |
| Rotation | 1.71649[5] |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi Draconis (φ Dra / φ Draconis) is a fourth-magnitude star in the constellation Draco. It has the Flamsteed designation 43 Draconis.
In Chinese astronomy, Phi Draconis is called 柱史, Pinyin: Zhùshǐ, meaning Official of Royal Archives, because this star is marking itself and stand alone in Official of Royal Archives asterism, Purple Forbidden enclosure (see : Chinese constellation).[6] Possibly, 柱史 (Zhùshǐ) westernized into Kwei She by R.H. Allen, with the unknown meaning, but it was for χ Dra[7]
See also
- Lists of stars in the constellation Draco
- Class A Stars
- Star system
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 10 日
- ↑ Star Name - R.H. Allen p.212
External links
- Jim Kaler's Stars, University of Illinois: PHI DRA (Phi Draconis)
- An Atlas of the Universe: Multiple Star Orbits
