Phi Draconis
 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 2 3 4 "V* phi Dra -- Variable Star of alpha2 CVn type". SIMBAD Astronomical Object Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-11-21.
- 1 2 3 4 van Leeuwen, F. (November 2007). "Hipparcos, the New Reduction" (VizieR). Astronomy and Astrophysics (Centre de Données astronomiques de Strasbourg) 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Retrieved 2010-11-22.
- 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. (PDF) origin: SIMBAD. Bibcode:1986EgUBV........0M.
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode:2009yCat....102025S.
- 1 2 3 4 5 6 7 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N
- ↑ (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
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Coordinates: 
18h 20m 45.43s, +71° 20′ 16.13″
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