HD 27894
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| Observation data Epoch 2000 |
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|---|---|
| Constellation | Reticulum |
| Right ascension | 4h 20m 47.05s |
| Declination | -59° 24' 39.01" |
| Apparent magnitude (V) | 9.42 |
| Distance | 138.1 ly (42.37 pc) |
| Spectral type | K2V |
| Other designations | |
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CD-59°829, HIP 20277
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HD 27894 is a 9th magnitude star in the constellation of Reticulum. It is an orange dwarf (spectral type K2 V), a type of stars dimmer and cooler than our Sun.
In 2005 the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.
[edit] HD 27894 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis | (a) | 0.122 AU |
| Eccentricity | (e) | 0.049 ± 0.008 |
| Orbital period | (P) | 17.991 ± 0.007 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 132.9 ± 9.7° |
| Time of periastron | (τ) | 2,453,275.46 ± 0.48 JD |
| Physical characteristics | ||
| Mass | >0.62 MJ | |
| Radius | ? RJ | |
| Density | ? kg/m³ | |
| Temperature | ? K | |
| Discovery | ||
| Discovery date | 2005 | |
| Detection method(s) | ||
| Discoverer(s) | Moutou, Mayor, Bouchy et al. |
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The planet, designated as HD 27894 b, is a gas giant with a mass at least two thirds that of Jupiter, or twice that of Saturn. The distance from the planet to the star is one third compared that of Mercury from our Sun, and it takes almost exactly 18 days to complete one roughly circular orbit.
[edit] References
- Moutou et al. (2005). "The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454". Astronomy and Astrophysics 439: 367-373.
[edit] External links
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