Global InformationXi2 Sagittarii information
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 57m 43.80s[1] |
| Declination | −21° 06′ 23.97″[1] |
| Apparent magnitude (V) | +3.51[2] |
| Characteristics | |
| Spectral type | G8/K0 II/III[3] |
| U−B color index | +1.13[2] |
| B−V color index | +1.18[2] |
| Astrometry | |
| Radial velocity (Rv) | −20.10[4] km/s |
| Proper motion (μ) | RA: 33.52 mas/yr[1] Dec.: -13.552 mas/yr[1] |
| Parallax (π) | 8.4092 ± 0.1972 mas[1] |
| Distance | 388 ± 9 ly (119 ± 3 pc)[1] |
| Absolute magnitude (MV) | −1.72[5] |
| Details[6] | |
| Mass | 3.627±0.143 M☉ |
| Radius | 26.747±1.97 R☉ |
| Luminosity | 676[4] 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[7] | |
| 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.[8][9] It is visible to the naked eye with a combined apparent visual magnitude of +3.51.[2] Based upon an annual parallax shift of 8.4 mas as seen from Earth,[1] 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,[3] 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. [6] 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.[4]
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