HD 74156
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 42m 25.1222s |
| Declination | +04° 34' 41.151" |
| Apparent magnitude (V) | 7.62 |
| Distance | 210.6 ly (64.56 pc) |
| Spectral type | G0V |
| Other designations | |
|
BD+05°2035,HIP 42723
|
|
HD 74156 is a yellow dwarf star (spectral type G0V) in the constellation of Hydra, 210 light years from our solar system. It is known to be orbited by two large planets.
Contents |
[edit] HD 74156 b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.294 AU |
| Eccentricity | (e) | 0.636±0.009 |
| Orbital period | (P) | 51.643±0.011 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 181.5±1.4° |
| Time of periastron | (τ) | 2,451,981.32±0.09 JD |
| Physical characteristics | ||
| Mass | (m) | >1.86±0.03 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2001 | |
| Discoverer(s) | Naef, Mayor et al. | |
| Detection method | Radial velocity | |
| Discovery status | Confirmed | |
HD 74156 b is an extrasolar planet at least 80% more massive than Jupiter that orbits very close to the star. Its surface temperatures must be high. It is most likely a gas giant.
[edit] HD 74156 c
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 3.40 AU |
| Eccentricity | (e) | 0.583±0.039 |
| Orbital period | (P) | 2025±11 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 242.4±4° |
| Time of periastron | (τ) | 2,450,901±10 JD |
| Physical characteristics | ||
| Mass | (m) | >6.17±0.23 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2001 | |
| Discoverer(s) | Naef, Mayor et al. | |
| Detection method | Radial velocity | |
| Discovery status | Confirmed | |
HD 74156 c is a large extrasolar planet at least six times the mass of Jupiter, with an eccentric orbit that occasionally passes through the star's habitable zone. It would thus be subject to extreme shifts of temperature. It is most likely a gas giant.
[edit] See also
[edit] References
- Naef et al. (2004). "The ELODIE survey for northern extra-solar planets III. Three planetary candidates detected with ELODIE". Astronomy and Astrophysics 414: L351-359.
[edit] External links
- HD 74156. SIMBAD. Retrieved on 14 April 2006.
- Notes for star HD 74156. The Extrasolar Planets Encyclopaedia. Retrieved on 14 April 2006.
- John Whatmough. HD 74156. Extrasolar Visions. Retrieved on 14 April 2006.
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