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 | |
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]