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Delta Sagittarii
Double binary star in the constellation Sagittarius / From Wikipedia, the free encyclopedia
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Delta Sagittarii (δ Sagittarii, abbreviated Delta Sgr, δ Sgr), formally named Kaus Media /ˌkɔːs ˈmiːdiə/,[10][11] is a star in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of this star is +2.70,[2] making it easily visible to the naked eye. Parallax measurements place the distance at roughly 348 light-years (107 parsecs) from the Sun.[1]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 20m 59.64354s[1] |
Declination | −29° 49′ 41.1659″[1] |
Apparent magnitude (V) | +2.70[2] |
Characteristics | |
Spectral type | K3 III[3] |
U−B color index | +1.55[2] |
B−V color index | +1.38[2] |
Astrometry | |
Radial velocity (Rv) | –19.9[4] km/s |
Proper motion (μ) | RA: +32.54[1] mas/yr Dec.: −25.57[1] mas/yr |
Parallax (π) | 9.38 ± 0.18 mas[1] |
Distance | 348 ± 7 ly (107 ± 2 pc) |
Absolute magnitude (MV) | −1.99[5] |
Details | |
δ Sgr A | |
Mass | 3.21[6] M☉ |
Radius | 76.84[6][lower-alpha 1] R☉ |
Luminosity | 1,660[6] L☉ |
Surface gravity (log g) | 0.30[7] cgs |
Temperature | 4,203±69[6] K |
Metallicity [Fe/H] | −0.32[7] dex |
Rotational velocity (v sin i) | 3.6[8] km/s |
Age | 260[6] Myr |
Other designations | |
Database references | |
SIMBAD | Delta Sagittarii |
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