HD 192699
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Aquila |
| Right ascension | 20h 16m 06s |
| Declination | +04° 34′ 51″ |
| Apparent magnitude (V) | 6.45 |
| Distance | 219.8 ly (67.4 pc) |
| Spectral type | G8IV |
| Other designations | |
HD 192699 is a star in the Aquila constellation. It is a yellow subgiant with apparent magnitude 6.45, the distance is 220 ly. Based on its mass of 1.68 solar, it was an A-type star when it was a main-sequence.
In April 2007, a planet was announced orbiting the star, together with HD 175541 b and HD 210702 b.
Contents |
[edit] HD 192699 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.16 AU |
| Eccentricity | (e) | 0.149 ± 0.06 |
| Orbital period | (P) | 351.5 ± 6 d |
| Angular distance | (θ) | 17.313 mas |
| Longitude of periastron |
(ω) | 54 ± 30° |
| Time of periastron | (T0) | 2452994 ± 30 JD |
| Semi-amplitude | (K) | 48.1 ± 5 m/s |
| Physical characteristics | ||
| Mass | (m) | >2.5 MJ |
| Discovery information | ||
| Discovery date | April, 2007 | |
| Discoverer(s) | Johnson et al. | |
| Detection method | Doppler Spectroscopy | |
| Discovery status | Published | |
HD 192699 b is an exoplanet 2.5 times the mass of Jupiter. Despite of its orbital distance more than Earth, the orbital period is less than a year, that's because the parent star is more massive than the Sun.
It is one of the three planets that have indirect evidence for a planetary systems 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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