Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 16h 50m 09.8s[1] |
Declination | –34° 17′ 36″[1] |
Apparent magnitude (V) | +2.310[2] (2.24 - 2.35)[3]) |
Characteristics | |
Spectral type | K1 III[4] |
U−B color index | +1.147[2] |
B−V color index | +1.150[2] |
Variable type | suspected[3] |
Astrometry | |
Radial velocity (Rv) | –2.5[5] km/s |
Proper motion (μ) | RA: –614.85[1] mas/yr Dec.: –255.98[1] mas/yr |
Parallax (π) | 51.19 ± 0.22 mas[1] |
Distance | 63.7 ± 0.3 ly (19.54 ± 0.08 pc)[1] |
Absolute magnitude (MV) | 0.78 ± 0.04[6] |
Details[7] | |
Mass | 1.4±0.1 M☉ |
Radius | 15.5±0.5 R☉ |
Luminosity | 53.7±0.6 L☉ |
Surface gravity (log g) | 2.1±0.07 cgs |
Temperature | 4583±125 K |
Metallicity [Fe/H] | –0.17 dex |
Rotational velocity (v sin i) | 2.6 ± 0.5[8] km/s |
Age | 3.92[9] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Scorpii (ε Scorpii, abbreviated Eps Sco, ε Sco), formally named Larawag /ˈlærəwæɡ/,[11] is a star in the southern zodiac constellation of Scorpius. It has an apparent visual magnitude of +2.3,[2] making it the fifth-brightest member of the constellation. Parallax measurements made during the Hipparcos mission provide an estimated distance to this star of around 63.7 light-years (19.5 parsecs) from the Sun.[1]
Epsilon Scorpii has a stellar classification of K1 III,[4] which indicates it has exhausted the supply of hydrogen at its core and evolved into a giant star. Currently, it has expanded to 15.5 times the Sun's size and is emitting 54 times its luminosity.[7] Presently it is generating energy through the nuclear fusion of helium at its core, which, considering the star's composition, places it along an evolutionary branch termed the red clump.[12] The star's outer atmosphere has an effective temperature of 4,580 K,[7] giving it the orange hue of a cool K-type star.
ε Scorpii is classified as a suspected variable star,[3] although a study of Hipparcos photometry showed a variation of no more than 0.01–0.02 magnitudes.[12] It is an X-ray source with a luminosity of (1.5–1.6) × 1027 erg s−1.[6][13]
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