HD 81040
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Leo |
| Right ascension | 09h 23m 47.0873s |
| Declination | +20° 21' 52.034" |
| Apparent magnitude (V) | +7.74 |
| Distance | 106.2 ly (32.56 pc) |
| Spectral type | G2/G3 |
| Other designations | |
|
BD+20°2374, FK5 4836, GC 12951, HIP 46070, SAO 80800
|
|
HD 81040 is a star in the constellation of Leo. It is G-type yellow dwarf like our Sun. The Sun dwarfs HD 81040 in terms of physical characteristics. The age of the star is not precisely known, the ELODIE spectrograph suggested the age of 0.8 Gyr and found to have young dust disk. Later measurements by modelling chromosperic activity suggested the age of 4.18 Gyr.
On November 24, 2005, the date of Thanksgiving day, the superjovian planet was announced by Sozzetti.
[edit] HD 81040 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 1.94 AU | |
| Eccentricity e: | 0.526 ± 0.042 | |
| Orbital period P: | 1001.7 ± 7 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 59.582 mas | |
| Longitude of periastron ω: |
81.3 ± 7.2° | |
| Time of periastron τ: | 2452504 ± 12 JD | |
| Semi-amplitude K: | 168 ± 9 m/s | |
| Physical characteristics | ||
| Mass: | >6.86 ± 0.71 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | 170 K | |
| Discovery | ||
| Discovery date: | November 24, 2005 | |
| Discovery site: | ||
| Detection method(s): | Doppler Spectroscopy | |
| Discoverer(s): | Sozzetti et al. | |
| Other catalogue | ||
HD 81040 b is a massive, Jupiter-sized gas giant planet that orbits the star HD 81040. The period is just over 1000 days. It has semimajor axis of 1.94 AU. However, the orbit is extremely eccentric, little over 0.5 in value. The planet occasionally passes through the habitable zone. It is likely that it may have moons.
[edit] References
- Sozzetti, A.; Udry, S.; Zucker, S.; Torres, G.; Beuzit, J. L.; Latham, D. W.; Mayor, M.; Mazeh, T.; Naef, D.; Perrier, C.; Queloz, D.; Sivan, J.-P. (2006). "A massive planet to the young disc star HD 81040". Astronomy and Astrophysics 449: 417–424. doi:.
[edit] External links
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