YZ Ceti

YZ Ceti

Location of YZ Ceti, click for larger image.
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 01h 12m 30.6369s[1]
Declination −16° 59′ 56.358″[1]
Apparent magnitude (V) 12.03 - 12.18[2]
Characteristics
Evolutionary stage red dwarf
Spectral type M4.0Ve[3]
U−B color index +1.430[4]
B−V color index +1.811[4]
Variable type Flare star[5]
Astrometry
Radial velocity (Rv)+28.09[6] km/s
Proper motion (μ) RA: 1,205.074[1] mas/yr
Dec.: 637.547[1] mas/yr
Parallax (π)269.0573 ± 0.0337 mas[1]
Distance12.122 ± 0.002 ly
(3.7167 ± 0.0005 pc)
Absolute magnitude (MV)14.30[3]
Details
Mass0.130±0.013[7] M☉
Radius0.168±0.009[7] R☉
Luminosity0.002195[8] L☉
Surface gravity (log g)5.20[8] cgs
Temperature3056±60[7] K
Metallicity [Fe/H]−0.26±0.08[7] dex
Rotation68.3 d[9]
Rotational velocity (v sin i)3.40[10] km/s
Age5.0±1.0[7] Gyr
Other designations
GCTP 248.01, GJ 54.1, HIP 5643, G 268-135, L 725-32, LHS 138, LTT 670, 2MASS J01123052-1659570
Database references
SIMBADdata

YZ Ceti is a red dwarf star in the constellation Cetus. Although it is relatively close to the Sun at just 12 light years, this star cannot be seen with the naked eye. It is classified as a flare star that undergoes intermittent fluctuations in luminosity. YZ Ceti is about 13 percent the mass of the Sun and 17% of its radius.

This star is unusually close to Tau Ceti, a star of spectral class G8. The two are only about 1.6 light years apart,[11] a little more than a third of the distance from the Sun to the Solar System's nearest neighbor, Proxima Centauri.

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