Iota Arietis
 Location of ι Arietis (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 01h 57m 21.05476s[1] |
| Declination | +17° 49′ 03.1202″[1] |
| Apparent magnitude (V) | 5.117[2] |
| Characteristics | |
| Spectral type | K1 Vp[3] |
| U−B color index | +0.700[2] |
| B−V color index | +0.921[2] |
| Astrometry | |
| Radial velocity (Rv) | –4.9[4] km/s |
| Proper motion (μ) | RA: +34.76[1] mas/yr Dec.: –22.95[1] mas/yr |
| Parallax (π) | 6.27 ± 0.33[1] mas |
| Distance | 520 ± 30 ly (159 ± 8 pc) |
| Absolute magnitude (MV) | –0.4[5] |
| Details | |
| Surface gravity (log g) | 2.42[5] cgs |
| Temperature | 4,235[5] K |
| Metallicity [Fe/H] | –0.37[5] dex |
| Other designations | |
Iota Arietis (ι Ari, ι Arietis) is the Bayer designation for a binary star system in the northern constellation of Aries. It has an apparent visual magnitude of 5.117;[2] bright enough to be dimly seen with the naked eye. Parallax measurements made during the Hipparcos mission yield an estimated distance of 520 light-years (160 parsecs) from Earth.[1]
This is a spectroscopic binary system with an orbital period of 1,568 days (4.3 years) and an eccentricity of 0.36. The primary is a K-type main sequence star with a stellar classification of K1 Vp. (The 'p' indicates some type of peculiarity with the spectrum.) The companion is a suspected white dwarf.[3]
References
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