Xi Draconis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 17h 53m 31.72962s |
| Declination | +56° 52′ 21.5143″ |
| Apparent magnitude (V) | 3.75 |
| Characteristics | |
| Spectral type | K2 III |
| U−B color index | +1.21 |
| B−V color index | +1.18 |
| Astrometry | |
| Radial velocity (Rv) | -26.38 ± 0.20 km/s |
| Proper motion (μ) |
RA: 93.82 ± 0.14 mas/yr Dec.: 78.50 ± 0.12 mas/yr |
| Parallax (π) | 28.98 ± 0.12mas |
| Distance | 112.5 ± 0.5 ly (34.5 ± 0.1 pc) |
| Details | |
| Mass | 1.45 ± 0.17 M☉ |
| Radius | 12 R☉ |
| Luminosity | 49 ± 4 L☉ |
| Surface gravity (log g) | 2.3 cgs |
| Temperature | 4,445 K |
| Metallicity [Fe/H] | –0.09 dex |
| Rotational velocity (v sin i) | 2.3 km/s |
| Other designations | |
Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra), also named Grumium, is a star in the northern circumpolar constellation of Draco. It has an apparent visual magnitude of 3.75. Based upon parallax measurements, it is located at a distance of 112.5 light-years (34.5 parsecs) from the Sun. At this distance, the apparent magnitude is diminished by 0.03 from extinction caused by intervening gas and dust.
ξ Draconis (Latinised to Xi Draconis) is the star's Bayer designation.
It bore the traditional name Grumium (or Genam). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Grumium for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.
This star, along with Beta Draconis (Rastaban), Gamma Draconis (Eltanin), Mu Draconis (Erakis) and Nu Draconis (Kuma) were Al ʽAwāïd "the Mother Camels", which was later known as the Quinque Dromedarii.
In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of Xi Draconis, Nu Draconis, Beta Draconis, Gamma Draconis and Iota Herculis. Consequently, Xi Draconis itself is known as 天棓一 (Tiān Bàng yī, English: the First Star of Celestial Flail.)
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