Iota Orionis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Orion |
| Right ascension | 05h 35m 26s |
| Declination | -05° 54′ 36″ |
| Apparent magnitude (V) | 2.77 |
| Characteristics | |
| Spectral type | O9 III/B1 III |
| U-B color index | -1.08 |
| B-V color index | -0.24 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | 22 km/s |
| Proper motion (μ) | RA: 2.27 mas/yr Dec.: -0.62 mas/yr |
| Parallax (π) | 2.46 ± 0.77 mas |
| Distance | approx. 1300 ly (approx. 400 pc) |
| Absolute magnitude (MV) | -5.3 |
| Details | |
| Mass | 15 M☉ |
| Radius | ? R☉ |
| Luminosity | 12,600 L☉ |
| Temperature | 31,500 K |
| Metallicity | ? |
| Rotation | 130 km/s. |
| Age | ? years |
| Other designations | |
Iota Orionis (ι Ori / ι Orionis) is the brightest star in Orion's sword. This system is at the tip of the sword. It also has the traditional names Hatsya (sometimes with the typographic error Hatysa), or in Arabic, Na’ir al Saif, which means simply "the Bright One of the Sword."
This is a quadruple system dominated by a massive spectroscopic binary with an eccentric (e=0.764), 29-day orbit. The collision of the stellar winds from this pair makes the system a strong X-ray source.
[edit] External links
- Iota Orionis by Dr. Jim Kaler.
- David Darling's encyclopedia entry
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