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ι Aurigae |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Auriga |
| Right ascension | 04h 56m 59.6187s |
| Declination | +33° 09′ 57.925″ |
| Apparent magnitude (V) | 2.693 |
| Characteristics | |
| Spectral type | K3II |
| U−B color index | 1.78 |
| B−V color index | 1.53 |
| R−I color index | 0.82 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | 17.5 km/s |
| Proper motion (μ) | RA: 3.63 mas/yr Dec.: -18.54 mas/yr |
| Parallax (π) | 6.37 ± 0.96 mas |
| Distance | 512 ly (157 pc) |
| Absolute magnitude (MV) | 4.245 |
| Details | |
| Mass | 5.5[1] M☉ |
| Radius | 55[1] R☉ |
| Luminosity | 726 L☉ |
| Temperature | 4060[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Iota Aurigae (ι Aur, ι Aurigae) is a star in the constellation Auriga. It has the traditional name Al Kab, short for Kabdhilinan, from the Arabic الكعب ذي العنان al-kacb ðīl-cinān "the ankle of the rein holder (charioteer)". Under the name Alkab, this star is a marker on the astrolabe described by Geoffrey Chaucer in his Treatise on the Astrolabe in 1391. In Antonín Bečvář's atlas it has the traditional name Hassaleh.
Iota Aurigae is an orange K-type bright giant with an apparent magnitude of +2.69. It is approximately 512 light-years from Earth, and is dimmed by approximately 0.6 points of magnitude by interstellar dust.[2]
It is known as 五車一 ( the First Star of the Five Chariots) in Chinese.
During the Extreme Solar Systems conference held on June 25–29, 2007, in Santorini, Greece, Reffert et al. announced the detection of two substellar objects orbiting Iota Aurigae in 2:1 resonance. Such companions would be brown dwarfs with orbital periods of approximately 2 and 4 years. No minimum mass for the candidates was provided. So far the detection has not been confirmed, though Hekker et al. (2008) listed significant radial velocity variations at periods of 767 and 1586 days.[3][4]
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