Xi2 Sagittarii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 57m 43.80s |
| Declination | −21° 06′ 24.0″ |
| Apparent magnitude (V) | +3.51 |
| Characteristics | |
| Spectral type | G8/K0 II/III |
| U−B color index | +1.13 |
| B−V color index | +1.18 |
| Astrometry | |
| Radial velocity (Rv) | −20.10 km/s |
| Proper motion (μ) | RA: 33.52 mas/yr Dec.: -13.552 mas/yr |
| Parallax (π) | 8.4092±0.1972 mas |
| Distance | 388 ± 9 ly (119 ± 3 pc) |
| Absolute magnitude (MV) | −1.72 |
| Details | |
| Mass | 3.627±0.143 M☉ |
| Radius | 26.747±1.97 R☉ |
| Luminosity | 676 L☉ |
| Surface gravity (log g) | 2.39±0.19 cgs |
| Temperature | 4,682±75 K |
| Metallicity [Fe/H] | 0±0.5 dex |
| Age | 253±33 Myr |
| Other designations | |
| ξ2 Sgr, 37 Sgr, BD−21°5201, FK5 710, HD 175775, HIP 93085, HR 7150, SAO 187504 | |
| Database references | |
| SIMBAD | data |
Xi2 Sagittarii, Latinized from ξ2 Sagittarii, is a star in the zodiac constellation of Sagittarius. Data collected during the Hipparcos mission suggests it is an astrometric binary, although nothing is known about the companion. It is visible to the naked eye with a combined apparent visual magnitude of +3.51. Based upon an annual parallax shift of 8.4 mas as seen from Earth, this system is located around 390 light years from the Sun.
The spectrum of Xi2 Sagittarii yields a mixed stellar classification of G8/K0 II/III, showing traits of a G- or K-type giant or bright giant star. It has an estimated 3.6 times the mass of the Sun and about 27 times the Sun's radius. At an age of around 380 million years, it is radiating 676 times the Sun's luminosity from its photosphere at an effective temperature of 4,541 K.