Gliese 666
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| Gliese 666 A | |
| Stellar characteristics | |
|---|---|
| Constellation | Ara |
| Right ascension (Epoch J2000) | 07h 19m 63.84s |
| Declination (Epoch J2000) | -46° 38' 10.44" |
| Spectral type | G8-K0 V |
| Distance from Sol | 28.7 ly |
| Other designations | 41 Arae A, 41 Ara, HR 6416, Gl 666 A, Hip 84720, HD 156274, CD-46 11370, CP(D)-46 8513, SAO 227816, BSO 13 A, LHS 444, LTT 6886, LPM 636, LFT 1334, Brs 13. |
| Gliese 666 B | |
| Stellar characteristics | |
|---|---|
| Constellation | Ara |
| Right ascension (Epoch J2000) | 07h 19m 63.84s |
| Declination (Epoch J2000) | -46° 38' 10.44" |
| Spectral type | K7-M0 Vp |
| Distance from Sol | 28.7 ly |
| Other designations | 41 Arae B, Gl 666 B, BSO 13 B, LHS 445. |
This binary system is located only about 28.7 light-years away from our Sun, Sol. It lies in the north central part of the constellation Ara, the Altar.
According to Roland Wielen[1], who used a computer to mathematically iterate photographic observations to "best fit" estimates, AB travel in an extremely eccentric orbit (e= 0.901) that takes 2,200 years to complete, with a semi-major axis of 210 AUs.
On the other hand, N. Wieth-Knudsen[2] found that the orbit of the AB pair took only 693 years to complete, given a semi-major axis of 91.5 AUs with an eccentricity of 0.779.
Gliese 666 A
Gliese 666 A is a main sequence, yellow-orange dwarf (G8-K0 V). It has about 58 percent of Sol's diameter and around 42 percent of its luminosity. The star does not appear to be as enriched as Sol in elements heavier than hydrogen ("metals") because it has only 45 percent of Sol's abundance of iron[3]. Thus, Gliese 666 A may be a relatively old star. In addition to Star B, Gliese 666 A may also have two optical companions.
The distance from 41 Arae A where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.64 AU -- between at about the orbital distances of Mercury and Venus in the Solar System.
Gliese 666 B
This star is a main sequence, orange-red or red dwarf (K7-M0 Vp), with peculiar metal-weak spectrum for CA I, CA II, and CR triplet[4]. An Earth-type planet around Star B would have to be centered around 0.15 AU.
(Data from SolStation.com)
Notes
- ↑ (Wielen, 1962)
- ↑ (Inf. Circ. 13, 1957)
- ↑ (Cayrel de Strobel et al, 1991, page 301)
- ↑ (Christopher J. Corbally, S.J., 1984)
