HD 210702
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Pegasus |
| Right ascension | 22h 11m 51.3s |
| Declination | +16° 02′ 26.0″ |
| Apparent magnitude (V) | 5.94 |
| Distance | 182.4 ly (55.9 pc) |
| Spectral type | K1IV |
| Other designations | |
HD 210702 is a subgiant star in the constellation Pegasus. With a mass of 1.8 times that of the Sun, the star spent its main-sequence life as an A-type star. The visual luminosity is 11.38 times that of the Sun and it is 182.4 light years away. The magnitude is near the naked-eye limit, but binoculars can easily see the star.
In April 2007, a planet was found orbiting the star.
Contents |
[edit] HD 210702 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.17 AU |
| Eccentricity | (e) | 0.152 ± 0.08 |
| Orbital period | (P) | 341.1 d |
| Angular distance | (θ) | 20.893 mas |
| Longitude of periastron |
(ω) | 301 ± 30° |
| Time of periastron | (T0) | 2453118 ± 40 JD |
| Semi-amplitude | (K) | 59 ± 18 m/s |
| Physical characteristics | ||
| Mass | (m) | >2 MJ |
| Discovery information | ||
| Discovery date | April 2007 | |
| Discoverer(s) | Johnson et al. | |
| Detection method | Doppler spectroscopy | |
| Discovery status | Published | |
HD 210702 b, together with HD 175541 b and HD 192699 b, are planets around intermediate mass stars that were announced in April 2007 by Johnson et al. It has twice the mass of Jupiter and it orbits with semimajor axis of 1.17 AU, corresponding to a period of 341.1 days.
Planets around intermediate mass subgiants provide clues for the history of formation and migration of planets around 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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