Upsilon Scorpii

Not to be confused with U Scorpii.
υ Scorpii
Location of υ Scorpii (circled)
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]
Distance580 ± 20 ly
(177 ± 6 pc)
Absolute magnitude (MV)−3.53[5]
Details
Mass11.4 ± 0.5[6] M☉
Radius6.1[7] R☉
Luminosity7381[5] L☉
Temperature22,831 ± 169[7] K
Age20.0 ± 2.6[6] Myr
Other designations
Lesath, υ Sco, 34 Sco, 34 Scorpii, CD-37° 11638, HD 158408, HIP 85696, HR 6508, SAO 208896.[8]
Database references
SIMBADdata

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]

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  2. ^ a b c Cite error: The named reference apjs15_459 was invoked but never defined (see the help page).
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  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference mnras189_601 was invoked but never defined (see the help page).
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  9. ^ "Naming Stars". IAU.org. Retrieved 18 June 2018.
  10. ^ Cite error: The named reference schaaf2007 was invoked but never defined (see the help page).