Iota1 Scorpii
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Scorpius |
| Right ascension | 17h 47m 35.1s |
| Declination | −40° 07′ 37″ |
| Apparent magnitude (V) | 3.02 |
| Characteristics | |
| Spectral type | F2 Iae |
| U-B color index | 0.27 |
| B-V color index | 0.51 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | −27.6 km/s |
| Proper motion (μ) | RA: 0.44 mas/yr Dec.: −6.40 mas/yr |
| Parallax (π) | 1.82 ± 0.73 mas |
| Distance | approx. 1800 ly (approx. 500 pc) |
| Absolute magnitude (MV) | -5.68 |
| Details | |
| Mass | 12 M☉ |
| Radius | 125 R☉ |
| Luminosity | 29,000 L☉ |
| Temperature | 6,700 K |
| Metallicity | ? |
| Rotation | 36 km/s |
| Age | ? years |
| Other designations | |
Iota-1 Scorpii is a yellow-white F-type supergiant with an apparent magnitude of +3.02. (Different sources give apparent magnitudes in the range 2.99–3.03.) It is approximately 1800 light years from Earth. It has a 13th magnitude companion 37.5 arcseconds, or at least 20,000 astronomical units (AU), away from it.
[edit] External links
- Iota-1 Scorpii by Dr. Jim Kaler.
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