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±0.12 mas |
| Distance | 112.5 ± 0.5 ly (34.5 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.06 |
| Details | |
| Mass | 1.45 ± 0.17 M☉ |
| Radius | 11.56±0.06 R☉ |
| Luminosity | 47.30±0.44 L☉ |
| Surface gravity (log g) | 2.3 cgs |
| Temperature | 4,451±7 K |
| Metallicity [Fe/H] | −0.09 dex |
| Rotational velocity (v sin i) | 2.3 km/s |
| Other designations | |
| 32 Dra, BD+56 2033, FK5 671, HD 163588, HIP 87585, HR 6688, SAO 30631, WDS 17535+5652. | |
| Database references | |
| SIMBAD | data |
Xi Draconis (ξ Draconis, abbreviated Xi Dra, ξ Dra) is a double or binary 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.
The two components are designated Xi Draconis A (officially named Grumium /ˈɡruːmiəm/, a traditional name for the system) and B.