Chi3 Sagittarii (χ3 Sagittarii) is a solitary,[11] orange-hued star in the zodiac constellation of Sagittarius. It is faintly visible to the naked eye with an apparent visual magnitude of +5.45.[2] Based upon an annual parallax shift of 6.53 mas as seen from Earth,[1] it is located roughly 500 light years from the Sun. It is receding from the Earth with a radial velocity of 39.6 km/s.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Sagittarius |
Right ascension | 19h 25m 29.65949s[1] |
Declination | −23° 57′ 44.8390″[1] |
Apparent magnitude (V) | +5.448[2] |
Characteristics | |
Spectral type | K3 III[3] |
U−B color index | +1.662[2] |
B−V color index | +1.443[2] |
Variable type | suspected[4] |
Astrometry | |
Radial velocity (Rv) | +39.6[5] km/s |
Proper motion (μ) | RA: −18.66[1] mas/yr Dec.: −12.73[1] mas/yr |
Parallax (π) | 6.53 ± 0.42 mas[1] |
Distance | 500 ± 30 ly (153 ± 10 pc) |
Absolute magnitude (MV) | −0.46[6] |
Details | |
Radius | 37[7] R☉ |
Luminosity | 301[8] L☉ |
Surface gravity (log g) | 1.860[9] cgs |
Temperature | 4,040[9] K |
Metallicity [Fe/H] | −0.10[9] dex |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved, K-type giant star with a stellar classification of K3 III.[3] It is a suspected optical variable star with a magnitude range of 5.42 to 5.46.[4] At infrared wavelengths, it shows large amplitude variation with a period of 505 days.[12] The star has expanded to about 37[7] times the Sun's radius and is radiating 301[8] times the solar luminosity from its photosphere at an effective temperature of 4,040 K.[9]
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