HD 175541
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Serpens |
| Right ascension | 18h 55m 40.9s |
| Declination | +04º 15' 55.2" |
| Apparent magnitude (V) | 8.03 |
| Distance | 416 ly (127.55 pc) |
| Spectral type | G8IV |
| Other designations | |
HD 175541 is an intermediate-mass subgiant star in the constellation Serpens. That means when this star was a main-sequence, it was an A-type star.
It is an 8th magnitude star about 416 light years from Earth. Despite of its distance of over 100 ly, there is the Gliese number 736.
In April 2007, the planet was found orbiting around one of the three preferred intermediate-mass subgiants that has changes in radial velocity trends.
Contents |
[edit] HD 175541 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.03 AU |
| Eccentricity | (e) | 0.33 ± 0.2 |
| Orbital period | (P) | 297.3 ± 6 d |
| Angular distance | (θ) | 8.047 mas |
| Longitude of periastron |
(ω) | 183 ± 30° |
| Time of periastron | (T0) | 2,450,213 ± 20 JD |
| Semi-amplitude | (K) | 14 ± 2 m/s |
| Physical characteristics | ||
| Mass | (m) | >0.61 MJ |
| Discovery information | ||
| Discovery date | April 2007 | |
| Discoverer(s) | Johnson et al. | |
| Detection method | Doppler spectroscopy | |
| Discovery status | Published | |
HD 175541 b is a jovian planet. Despite the distance of planet to star slightly more than Earth to the Sun, the period is less than 300 days that orbits in an eccentric orbit.
The discovery of this planet and two others: HD 192699 b and HD 210702 b around intermediate-mass stars provide clues about the formation and history of migration of planets around the A-type stars.
[edit] References
- Johnson et al. (04-2007). "Three exoplanets orbiting intermediate-mass subgiants". The Astrophysical Journal 665: 31. doi:.
[edit] See also
[edit] External links
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