Kappa Orionis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 47m 45.4s |
| Declination | -09° 40′ 11″ |
| Apparent magnitude (V) | 2.06 |
| Spectral Characteristics | |
| Spectral type | B0.5 Iavar |
| U-B color index | -1.03 |
| B-V color index | -0.17 |
| Variable type | Slightly |
| Astrometry | |
| Radial velocity (Rv) | 21 km/s |
| Proper motion (μ) | RA: 1.55 mas/yr Dec.: -1.20 mas/yr |
| Parallax (π) | 4.52 ± 0.77 mas |
| Distance | approx. 700 ly (approx. 220 pc) |
| Absolute magnitude (MV) | -4.66 |
| Physical Characteristics | |
| Mass | 15-17 M☉ |
| Radius | 11 R☉ |
| Luminosity | 57,500 L☉ |
| Temperature | 26,000 K |
| Metallicity | ? |
| Rotation | ~82 km/s. |
| Age | ? years |
| Other designations | |
Kappa Orionis (κ Ori / κ Orionis / 53 Orionis) is the sixth-brightest star in the constellation of Orion. It also has the traditional name Saiph.
The name is from the Arabic saif al jabbar, sword of the giant.
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