Back Girtab AST Kappa de l'Escorpió Catalan Girtab German Girtab Spanish کاپا کژدم Persian Kappa Scorpii French קפא בעקרב HE कापा स्कोर्पाए तारा Hindi Girtab Italian さそり座カッパ星 Japanese
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 42m 29.27520s[1] |
| Declination | −39° 01′ 47.9391″[1] |
| Apparent magnitude (V) | 2.41 - 2.42[2] |
| Characteristics | |
| Spectral type | B1.5 III[3] |
| U−B color index | −0.914[4] |
| B−V color index | −0.228[4] |
| Variable type | β Cephei[2] |
| Astrometry | |
| Radial velocity (Rv) | −14.0[5] km/s |
| Proper motion (μ) | RA: −6.05[1] mas/yr Dec.: −25.54[1] mas/yr |
| Parallax (π) | 6.75 ± 0.17 mas[1] |
| Distance | 480 ± 10 ly (148 ± 4 pc) |
| Absolute magnitude (MV) | −3.46[6] |
| Orbit[7] | |
| Period (P) | 195.65 days |
| Eccentricity (e) | 0.488±0.005 |
| Periastron epoch (T) | 92.7±0.5 |
| Semi-amplitude (K1) (primary) | 48.0±0.3 km/s |
| Details | |
| κ Sco A | |
| Mass | 17[7] M☉ |
| Radius | 6.8[7] R☉ |
| Luminosity | 6,911[6] L☉ |
| Surface gravity (log g) | 4.01[7] cgs |
| Temperature | 23,400[7] K |
| Rotation | 1.90 days[7] |
| Rotational velocity (v sin i) | 105[8] km/s |
| Age | 25.1±1.3[9] Myr |
| κ Sco B | |
| Mass | 12[7] M☉ |
| Radius | 5.8[7] R☉ |
| Surface gravity (log g) | 4.00[7] cgs |
| Temperature | 18,800[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Scorpii, Latinized from κ Scorpii, is a binary star system in the southern constellation of Scorpius. With an apparent visual magnitude of 2.4, this star system is readily visible to the naked eye. Parallax measurements place it at an estimated distance of roughly 480 light-years (150 parsecs) from the Earth.
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