Kappa1 Ceti
 Location of κ1 Ceti (circled) |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Cetus |
| Right ascension | 03h 19m 21.6960s |
| Declination | +03° 22′ 12.712″ |
| Apparent magnitude (V) | 4.84 |
| Characteristics | |
| Spectral type | G5Vv |
| U−B color index | +0.185 |
| B−V color index | +0.674 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +19.9 km/s |
| Proper motion (μ) |
RA: 269.30 ± 0.24 mas/yr Dec.: 93.75 ± 0.22 mas/yr |
| Parallax (π) | 109.41 ± 0.27mas |
| Distance | 29.81 ± 0.07 ly (9.14 ± 0.02 pc) |
| Absolute magnitude (MV) | 5.16 |
| Details | |
| Mass | 1.037 ± 0.042 M☉ |
| Radius | 0.95 ± 0.10 R☉ |
| Luminosity | 0.85 L☉ |
| Surface gravity (log g) | 4.51 cgs |
| Temperature | 5,708 K |
| Metallicity [Fe/H] | +0.05 dex |
| Rotation | 9.2 days |
| Rotational velocity (v sin i) | 4.5 km/s |
| Age | 300–400 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Kappa1 Ceti (κ1 Cet, κ1 Ceti) is a yellow dwarf star approximately 30 light-years away in the equatorial constellation of Cetus. The star was discovered to have a rapid rotation, roughly once every nine days. Though there are no extrasolar planets confirmed to be orbiting the star, Kappa1 Ceti is considered a good candidate to contain terrestrial planets (like the Earth). The system is a candidate binary star, but has not been confirmed. The star should not be confused with the star Kappa2 Ceti, which is ten times as distant.
Kappa1 Ceti is a yellow dwarf star of the spectral type G5Ve. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. The star has roughly the same mass as the Sun, with 95% of the Sun's radius but only 85 percent of the luminosity. It is unclear whether the star is equal or is more enriched in elements heavier than hydrogen, but it is determined that the star has between 98 and 240 percent of the Sun's abundance of iron. Kappa1 Ceti is much younger than the Sun, and may only be around 800 million years old.
The rapid rotation rate of this star, approximately once every nine days, is indicative of a relatively youthful body several hundred million years in age. Due to starspots, the star varies slightly over the approximately the same period. The variations in period are thought to be caused by differential rotation at various latitudes, similar to what happens on the surface of the Sun. The star spots on Kappa1 Ceti range in latitude from 10° to 75° The magnetic properties of this star make it "an excellent match for the Sun at a key point in the Earth's past".
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