YZ Ceti

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YZ Ceti
YZ Ceti.png
Location of YZ Ceti, click for larger image.
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 01h 12m 30.64s[1]
Declination −16° 59′ 56.3″[1]
Apparent magnitude (V) 12.10
Spectral type M4.5V
U−B color index 1.35
B−V color index 1.83
Variable type Flare star
Radial velocity (Rv) +28.2 km/s
Proper motion (μ) RA: 1208.53 ± 5.57[1] mas/yr
Dec.: 640.73 ± 3.71[1] mas/yr
Parallax (π) 267.4 ± 3.0 mas
Distance 12.2 ± 0.1 ly
(3.74 ± 0.04 pc)
Absolute magnitude (MV) 14.25
Other designations
GCTP 248.01, GJ 54.1, G 268-135, LHS 138, LTT 670, L 725-32, HIP 5643.
Database references

YZ Ceti is a red dwarf star in the constellation Cetus. Although it is relatively close to the Sun at just 12 light years,[1] 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 8.5 percent the mass of the Sun, and is normally less than 1/5,000th as luminous.[citation needed]

This star is unusually close to Tau Ceti, a star of spectral class G8. The two are only about 1.6 light years apart,[2] a little more than a third of the distance from the Sun to the Solar System's nearest neighbor, Proxima Centauri.

See also[edit]


  1. ^ a b c d e van Leeuwen, F. (2007). "HIP 5643". Hipparcos, the New Reduction. Retrieved 2010-08-22. 
  2. ^ Page of Tau Ceti, see the chapter of Closest Neighbors, for YZ Ceti.

External links[edit]