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|Right ascension (Epoch J2000)||00h 22m 51.55s|
|Declination (Epoch J2000)||−12° 12′ 34.5″|
|Spectral type||G2-3 V|
|Distance from Sol||66.5 ly|
|Other designations||BE Cet, 9 Cet, HR 88, Gl 17.3 or Wo 9012, Hip 1803, HD 1835, BD-16 30, SAO 147237, LTT 193.|
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, 1.07 times its diameter, 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. A babe compared to Sol, analysis of isochrones suggests that 9 Ceti may only be around 600 million years old .
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. 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)
- (Guinan et al, 1999)
- (Pasinetti-Fracassini et al, 2001)
- (Perrin and Karoji, 1987)
- (B.J. Taylor, 2003)
- (Messina and Guinan, 2003)
- (Cummings et al, 1999)