58 Eridani

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58 Eridani
Stellar characteristics
Right ascension (Epoch J2000)04h 47m 36.30s
Declination (Epoch J2000)-16° 56' 04.00"
Spectral typeG1-3 V
Distance from Sol43.4 ly
Other designations58 Eri, HR 1532, Gl 177, Hip 22263, HD 30495, BD-17 954, SAO 149888, LTT 2088.
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58 Eridani is located about 43.4 light-years from Sol. It lies in the northwestern corner of the constellation Eridanus, the River. The star is a yellow-orange main sequence dwarf star of spectral and luminosity type G1-3 V. Similar to Sol[1], this "Solar analogue" may have roughly the same mass, around 96 to 99 percent of its diameter[2][3][4], and 96 percent of its luminosity. It appears to be around 97 percent as enriched than Sol in elements heavier than hydrogen ("metals") based on its abundance of iron[5].

The star is considered to be a nearby, young Solar analogue -- with a spectral type from G0 to K2 and a coronal x-ray luminosity suggesting an age of less than 800 million years[6][7]. Little 10-micron emission from silicate dust in a circumstellar disk around the star was found suggesting that 58 Eridani may be more than 400 million years old although significant excess infrared emission was detected[8].

An Earth-type planet with liquid water on its surface would require a stable orbit centered around 0.96 AU from 58 Eridani -- just under the orbital distance of Earth in the Solar System. Such a planet would have an orbital period lasting close to an Earth year. However, given its conjectured young age, an Earth-sized planet is not likely to have developed an oxygen-rich atmosphere but is likely to be under heavy bombardment by asteroids and comets.

(Data from SolStation.com)


  1. (Giusa Cayrel de Strobel, 1996)
  2. (Pasinetti-Fracassini et al, 2001)
  3. (Perrin and Karoji, 1987)
  4. (Johnson and Wright, 1983, page 655)
  5. (B.J. Taylor, 2003)
  6. (Gaidos and Gonalez, 2002)
  7. (Eric J. Gaidos, 1998)
  8. (Gaidos and Koresko, 2003)