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 .[13][14]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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 |
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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] |
Distance | 136.0[4] pc |
Absolute magnitude (MV) | −3.8[8] |
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Orbit[4][9] |
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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 |
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δ Sco A |
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Mass | 13[4] M☉ |
Radius | 6.7[10] R☉ |
Luminosity | 38,000[11] L☉ |
Surface gravity (log g) | 3.92[8] cgs |
Temperature | 27,400[11] K |
Rotational velocity (v sin i) | 180[3] km/s |
δ Sco B |
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Mass | 8.2[4] M☉ |
Temperature | 20-24,000[4] K |
Age | 9-10[4][11] Myr |
Other designations |
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Dschubba, Dzuba, [12] Al Jabba, [12] Iclarkrau, [12] 7 Scorpii, BD−22°4068, HD 143275, HIP 78401, HR 5953, FK5 594, SAO 184014, CCDM 16003-2237 |
Database references |
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SIMBAD | data |
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