CD -32°8179
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| CD-32 8179 A | |
| Stellar characteristics | |
|---|---|
| Constellation | Hydra |
| Right ascension (Epoch J2000) | 11h 34m 29.5s |
| Declination (Epoch J2000) | -32° 49' 52.8" |
| Spectral type | K0 V |
| Distance from Sol | 31.1 ± 0.002 ly |
| Other designations | HR 4458, Gl 432 A, Hip 56452, HD 100623, CP(D)-32 3122, SAO 202583, LHS 308, LTT 4280, LFT 823, LPM 389, E 439-246. |
| CD-32 8179 B | |
| Stellar characteristics | |
|---|---|
| Constellation | Hydra |
| Right ascension (Epoch J2000) | 11h 34m 29.5s |
| Declination (Epoch J2000) | -32° 49' 52.8" |
| Spectral type | M V |
| Distance from Sol | 31.1 ± 0.002 ly |
| Other designations | HR 4459 B, Gl 432 B, LHS 309, VB 4. |
The CD-32 8179 binary system is located about 31.1 light-years (ly) away from our Sol, in the south central edge of Constellation Hydra, the Water Serpent -- southwest of Xi Hydrae, west of Beta Hydrae, and southeast of Chi1 Hydrae. The system may be visible to many Humans without a telescope.
Its designation as CD-32 8179 came from a visual survey of southern stars begun in 1892 at the Astronomical Observatory of Cordoba in Argentina under the direction of its second director John M. Thome (1843-1908). Thome died before the completion of this southern sky atlas in 1914, when 578,802 stars from declination -22° to -90° were published as the Cordoba Durchmusterung ("Survey").
As a relatively bright star in Earth's night sky, Star A is catalogued as Harvard Revised (HR) 4458, a numbering system derived from the 1908 Revised Harvard Photometry catalogue of stars visible to many Humans with the naked eye. The HR system has been preserved through its successor, the Yale Bright Star Catalogue -- updated and expanded through the hard work of E. Dorrit Hoffleit and others.
CD-32 8179 A
CD-32 8179 is a main-sequence orange-red dwarf star of spectral and luminosity type K0 V. It may have around 87 percent of Sol's mass, 84 percent of its diameter (Johnson and Wright, 1983, page 673), and 31 percent of its luminosity.
Star A has an average separation of about 80.5 AUs from its binary companion "B" -- a semi-major axis of 16.2" at a HIPPARCOS distance estimate of 31.1 ly (Poveda et al, 1994, pp. 68-69). Given estimated masses of 0.87 Solar for Star A and 0.08 Solar for Star B, their orbital period may last some 741 years.
The distance from Star A where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.56 AU -- between the orbital distances of Mercury and Venus in the Solar System. An Earth-type in such a water-zone orbit would probably would have a period of around 164 days or roughly half of an Earth year.
CD-32 8179 B
Star B is a main-sequence orange-red dwarf of spectral and luminosity type M V. It may only have around 8 percent of Sol's mass, 15 percent of its diameter (Johnson and Wright, 1983, page 673), and only 76 millionths of its luminosity.
For Star B, an Earth-type planet would have to orbit at around 0.0087 AUs away with a period of about 18.4 hours. As relatively small planets at close distances to their host stars, astronomers would have great difficulty in detecting such planets around either star using present methods.
(Boilerplate from SolStation.com)
