Delta Scorpii

δ Scorpii
Location of δ Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 00m 20.00528s[1]
Declination −22° 37′ 18.1431″[1]
Apparent magnitude (V) 1.59 - 2.32[2]
Characteristics
Spectral type B0.3 IV[3] + B1-3V[4]
U−B color index −0.920[5]
B−V color index −0.124[5]
Variable type γ Cas[6]
Astrometry
Radial velocity (Rv)−7[7] km/s
Proper motion (μ) RA: −10.21[1] mas/yr
Dec.: −35.41[1] mas/yr
Parallax (π)6.64 ± 0.89 mas[1]
Distance136.0[4] pc
Absolute magnitude (MV)−3.8[8]
Orbit[4][9]
Period (P)10.8092±0.0005 yr
Semi-major axis (a)0.09874±0.00007"
(13.5±0.1 AU)
Eccentricity (e)0.936±0.003
Inclination (i)36±1°
Longitude of the node (Ω)174.0±2.5°
Periastron epoch (T)2011 July 3rd
Argument of periastron (ω)
(secondary)		−2.3±3.8°
Semi-amplitude (K1)
(primary)		23.9±0.8 km/s
Details
δ Sco A
Mass13[4] M☉
Radius8.5[9] R☉
Luminosity38,000[10] L☉
Surface gravity (log g)3.92[8] cgs
Temperature27,400[10] K
Rotational velocity (v sin i)180[3] km/s
δ Sco B
Mass8.2[4] M☉
Temperature20-24,000[4] K
Age9-10[4][10] Myr
Other designations
Dschubba, Dzuba,[11] Al Jabba,[11] Iclarkrau,[11] 7 Scorpii, BD−22°4068, HD 143275, HIP 78401, HR 5953, FK5 594, SAO 184014, CCDM 16003-2237
Database references
SIMBADdata

Delta Scorpii (Latinised from δ Scorpii, abbreviated Delta Sco, δ Sco) is a binary star (the presence of a third star in the system is being debated[4]) in the constellation of Scorpius. The primary star is named Dschubba /ˈdʒʌbə/.[12][13]

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