12 Scorpii
Star in the constellation Scorpius
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12 Scorpii is a probable triple star[2] system in the zodiac constellation of Scorpius, located about 300 light years away from the Sun. It has the Bayer designation c1 Scorpii; 12 Scorpii is the Flamsteed designation. This system is faintly visible to the naked eye with a combined apparent visual magnitude of 5.67.[2] It is a probable (82% chance) member of the Sco OB2 moving group.[8]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 12m 16.039s[1] |
| Declination | −28° 25′ 02.31″[1] |
| Apparent magnitude (V) | 5.67 (5.79 + 7.9 + 8.13)[2] |
| Characteristics | |
| Spectral type | B9V[3] + K7.9XR? + F3V[2] |
| U−B color index | −0.19[4] |
| B−V color index | +0.01[4] |
| Astrometry | |
| Radial velocity (Rv) | −0.2±1.8[5] km/s |
| Proper motion (μ) | RA: −23.68±0.76[1] mas/yr Dec.: −42.44±0.69[1] mas/yr |
| Parallax (π) | 10.75±0.80 mas[1] |
| Distance | 300 ± 20 ly (93 ± 7 pc) |
| Absolute magnitude (MV) | +0.56[6] |
| Details | |
| 12 Sco A | |
| Mass | 2.939±0.088[6] M☉ |
| Luminosity | 91[6] L☉ |
| Temperature | 11,402[6] K |
| Age | 150[6] Myr |
| Other designations | |
| c1 Sco, 12 Sco, CD−28°11962, FK5 3226, HD 145483, HIP 79399, HR 6029, SAO 184217[7] | |
| Database references | |
| SIMBAD | data |
The magnitude 5.79[2] primary component is a B-type main-sequence star with a stellar classification of B9V.[3] This star is 150 million years old with three times the mass of the Sun. It is radiating 91 times the Sun's luminosity from its photosphere at an effective temperature of 11,402 K.[6] At an angular separation of 0.20″ is a K7.9 type secondary companion, a possible X-ray source. The third component is an F-type main-sequence star of class F3V and magnitude 8.13, located at a separation of 3.84″.[2]