9 Ceti

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Stellar characteristics
Right ascension (Epoch J2000)00h 22m 51.55s
Declination (Epoch J2000)−12° 12′ 34.5″
Spectral typeG2-3 V
Distance from Sol66.5 ly
Other designationsBE Cet, 9 Cet, HR 88, Gl 17.3 or Wo 9012, Hip 1803, HD 1835, BD-16 30, SAO 147237, LTT 193.
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9 Ceti is located about 66.5 light-years from Sol. It lies at the southwest corner of the constellation Cetus, the Whale or Sea Monster. 9 Ceti is a yellow-orange main sequence dwarf star of spectral and luminosity type G2-3 V. A little bigger and brighter than Sol, the star may have a mass similar to Sol's[1], 1.07 times its diameter[2][3], and 1.01 times its luminosity. It may be 1.45 times as enriched as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron[4]. A babe compared to Sol, analysis of isochrones suggests that 9 Ceti may only be around 600 million years old [5][1].

Past radial velocity analysis suggests that giant planets of one tenth to 10 times the mass of Jupiter do not exist within 0.1 to four AUs of 9 Ceti[6]. An Earth-type planet could have liquid water in a stable orbit centered around 1.0 AU from around 9 Ceti -- around the orbital distance of Earth in the Solar System. Such a planet would have an orbital period lasting close to one Earth year. As 9 Ceti is currently variable in luminosity, however, it may not provide the stable luminosity best suited to complex, Earth-type life. If the star is as young as 600 million years old, moreover, the crust of a rocky inner planet may be violently volcanic and undergoing heavy bombardment by large asteroids and comets.

(Data from SolStation.com)


  1. 1.0 1.1 (Guinan et al, 1999)
  2. (Pasinetti-Fracassini et al, 2001)
  3. (Perrin and Karoji, 1987)
  4. (B.J. Taylor, 2003)
  5. (Messina and Guinan, 2003)
  6. (Cummings et al, 1999)