Upsilon Scorpii
Star in the constellation Scorpius / From Wikipedia, the free encyclopedia
Not to be confused with U Scorpii.
Upsilon Scorpii (υ Scorpii, abbreviated Upsilon Sco, υ Sco), formally named Lesath /ˈliːsæθ/,[9] is a star located in the "stinger" of the southern zodiac constellation of Scorpius, the scorpion. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 580 light-years from the Sun.[1] In the night sky it lies near the 1.6 magnitude star Lambda Scorpii, and the two form an optical pair that is sometimes called the "Cat's Eyes".[10]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Scorpius |
Right ascension | 17h 30m 45.83712s[1] |
Declination | –37° 17′ 44.9285″[1] |
Apparent magnitude (V) | 2.70[2] |
Characteristics | |
Spectral type | B2 IV[3] |
U−B color index | –0.854[2] |
B−V color index | –0.221[2] |
Astrometry | |
Radial velocity (Rv) | +8.0[4] km/s |
Proper motion (μ) | RA: –2.37[1] mas/yr Dec.: 30.09[1] mas/yr |
Parallax (π) | 5.66 ± 0.18 mas[1] |
Distance | 580 ± 20 ly (177 ± 6 pc) |
Absolute magnitude (MV) | −3.53[5] |
Details | |
Mass | 11.4 ± 0.5[6] M☉ |
Radius | 6.1[7] R☉ |
Luminosity | 7381[5] L☉ |
Temperature | 22,831 ± 169[7] K |
Age | 20.0 ± 2.6[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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