Rho Scorpii
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Rho Scorpii (ρ Scorpii, abbreviated Rho Sco, ρ Sco) is a double star in the constellation of Scorpius. It has an apparent visual magnitude of +3.87, which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is located approximately 472 light years from the Sun.[1] At that distance, the visual magnitude of the system is reduced by 0.07 due to extinction from interstellar dust.[10] It is a member of the Upper Scorpius OB association.[11]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scorpius |
Right ascension | 15h 56m 53.07624s[1] |
Declination | −29° 12′ 50.6612″ [1] |
Apparent magnitude (V) | 3.86[2] |
Characteristics | |
Spectral type | B2 IV[3] |
U−B color index | -0.82[2] |
B−V color index | -0.20[2] |
Astrometry | |
Radial velocity (Rv) | −0.40[4] km/s |
Proper motion (μ) | RA: −15.68[1] mas/yr Dec.: −24.88[1] mas/yr |
Parallax (π) | 6.91 ± 0.19 mas[1] |
Distance | 470 ± 10 ly (145 ± 4 pc) |
Absolute magnitude (MV) | −1.93[5] |
Orbit[6] | |
Period (P) | 4.0033 d |
Eccentricity (e) | 0.27 |
Periastron epoch (T) | 2442178.6060 JD |
Argument of periastron (ω) (secondary) | 231° |
Semi-amplitude (K1) (primary) | 16.40 km/s |
Details | |
Mass | 7.94±0.55[3] M☉ |
Radius | 5.0[7] R☉ |
Luminosity (bolometric) | 3,432[3] L☉ |
Temperature | 21,150[3] K |
Rotational velocity (v sin i) | 113[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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It has two components, designated Rho Scorpii A and B. Rho Scorpii A is itself a single-lined spectroscopic binary whose components are designated Rho Scorpii Aa (formally named Iklil /ˈɪklɪl/, traditionally the name for several neighboring stars)[12] and Ab.