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Possible binary star system in the constellation Sagittarius From Wikipedia, the free encyclopedia
60 Sagittarii is a suspected binary star[10] system in the southern constellation of Sagittarius. It has the Bayer designation A Sagittarii, while 60 Sagittarii is the Flamsteed designation. This naked-eye object forms the northwest corner of the asterism called the Terebellum and, with an apparent magnitude of approximately 4.84,[2] it is the dimmest of the four stars in the Terebellum. It is located 379 light-years from the Sun, based on parallax, but is moving closer with a radial velocity of −51 km/s.[2]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Sagittarius |
Right ascension | 19h 58m 57.20292s[1] |
Declination | −26° 11′ 44.7585″[1] |
Apparent magnitude (V) | 4.84[2] |
Characteristics | |
Evolutionary stage | horizontal branch[3] |
Spectral type | G6 III[4] |
U−B color index | +0.55[5] |
B−V color index | +0.882±0.038[2] |
R−I color index | +0.47[5] |
Astrometry | |
Radial velocity (Rv) | −51.1±2.4[2] km/s |
Proper motion (μ) | RA: +35.31[6] mas/yr Dec.: +25.69[6] mas/yr |
Parallax (π) | 8.6025 ± 0.1732 mas[1] |
Distance | 379 ± 8 ly (116 ± 2 pc) |
Absolute magnitude (MV) | −0.07[2] |
Details | |
Radius | 17.42+0.68 −0.80[1] R☉ |
Luminosity | 170.3±4.0[1] L☉ |
Surface gravity (log g) | 2.78[7] cgs |
Temperature | 4,997+119 −96[1] K |
Metallicity [Fe/H] | −0.38[7] dex |
Other designations | |
Database references | |
SIMBAD | data |
The visible component is an aging G-type giant star with a stellar classification of G6 III,[4] having exhausted the supply of hydrogen at its core and expanded to 17[1] the Sun's radius. In the Bright Star Catalogue it was listed with a class of G6 III Ba0.2,[5] suggesting it is a mild barium star and thus might have a white dwarf companion.[10] It is a red clump giant, indicating it is on the horizontal branch and is generating energy through the fusion of helium at its core.[3] The star is radiating 170[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,997 K.[1]
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