Xi Draconis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 17h 53m 31.72962s[1] |
| Declination | +56° 52′ 21.5143″[1] |
| Apparent magnitude (V) | 3.75[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−B color index | +1.21[2] |
| B−V color index | +1.18[2] |
| Astrometry | |
| Radial velocity (Rv) | -26.38 ± 0.20[4] km/s |
| Proper motion (μ) | RA: 93.82 ± 0.14[1] mas/yr Dec.: 78.50 ± 0.12[1] mas/yr |
| Parallax (π) | 28.98 ± 0.12[1] mas |
| Distance | 112.5 ± 0.5 ly (34.5 ± 0.1 pc) |
| Details | |
| Mass | 1.45 ± 0.17[5] M☉ |
| Radius | 12[6] R☉ |
| Luminosity | 49 ± 4[5] L☉ |
| Surface gravity (log g) | 2.3[6] cgs |
| Temperature | 4,445[5] K |
| Metallicity [Fe/H] | –0.09[6] dex |
| Rotational velocity (v sin i) | 2.3[6] km/s |
| Other designations | |
Xi Draconis (ξ Dra, ξ Draconis) is the Bayer designation for a star in the northern circumpolar constellation of Draco. It has the traditional name Grumium or Genam. This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Erakis) and ν Dra (Kuma) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii.[7] This star has an apparent visual magnitude of 3.75.[2] Based upon parallax measurements, it is located at a distance of 112.5 light-years (34.5 parsecs) from Earth.[1] At this distance, the apparent magnitude is diminished by 0.03 from extinction caused by intervening gas and dust.[4]
In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of ξ Draconis, ν Draconis, β Draconis, γ Draconis and ι Herculis.[8] Consequently, δ Draconis itself is known as 天棓一 (Tiān Bàng yī, English: the First Star of Celestial Flail.)[9]
Structure
Xi Draconis is of spectral class K2-III.
Namesakes
USS Grumium (AK-112) was a United States Navy Crater class cargo ship named after the star.
References
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- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
