Sigma Draconis

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Sigma Draconis
Stellar characteristics
Right ascension (Epoch J2000)19h 32m 21.5908s
Declination (Epoch J2000)+69° 39' 40.232"
Spectral typeK0 V
Distance from Sol18.81 ± 0.05 ly
Other designationsAlsafi, σ Draconis, 61 Draconis, HD 185144, HR 7462, BD+69°1053, GCTP 4607.00, GJ 764, LHS 477, HIP 96100
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Sigma Draconis is a K-type main sequence star, explored by the Juraians (Tenchi Muyo Fen) in 2011. It is located about 18.8 light-years (ly) away from our Sun, Sol, in the northwestern part of the constellation Draco, the Dragon.

Sigma Draconis is a main-sequence orange-red dwarf star of spectral and luminosity type K0 V. The star has about 89 percent of Sol's mass[1], 79 percent of its diameter[2], and 39 percent of its luminosity. Although the star may only be about 3.3 billion years old, it appears to be less enriched than Sol in elements heavier than hydrogen ("metals") with only about 56 to 59 percent of Sol's abundance of iron[3].

The distance from Sigma Draconis where an Earth-type planet would be "comfortable" with liquid water can be crudely estimated as centered around 0.62 AU -- inside the orbital distance of Venus in the Solar System -- where a planet would have an orbital period of only about 199 days, or over half an Earth year. At such a distance to Sigma Draconis, astronomers are hoping to use NASA's TPF and the ESA's Darwin planned groups of observatories to search for a rocky inner planet in the so-called "habitable zone" (HZ) around Sigma Draconis.

(Data from


  1. (RECONS)
  2. (Pasinetti-Fracassini et al, 2001)
  3. (Cayrel de Strobel et al, 1991, page 33)