HD 188753 Ab
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| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
[[Image: |300px]] |
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| Parent star | ||
| Star | HD 188753 A | |
| Constellation | Cygnus | |
| Right ascension | (α) | 19h 54m 58.37s |
| Declination | (δ) | +41° 52′ 17.5″ |
| Spectral type | GV | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.0446 ± 0.001 AU |
| Eccentricity | (e) | 0.00 |
| Orbital period | (P) | 3.3481 ± 0.0009 d |
| Time of periastron | (T0) | 2,453,146.81 JD |
| Physical characteristics | ||
| Mass | (m) | >1.14 ± 0.1 MJ |
| Discovery information | ||
| Discovery date | 2005 | |
| Discoverer(s) | Konacki et al. | |
| Detection method | Doppler Spectroscopy | |
| Discovery status | Retracted | |
| Other designations | ||
|
Ho 581 Ab, BD+41°3535 Ab
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HD 188753 Ab is the name of a claimed extrasolar planet orbiting the star HD 188753 A.
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[edit] Discovery
HD 188753 Ab was claimed to be the first known exoplanet in a triple star system in 2005 by Dr. Maciej Konacki, a Polish astronomer working in the United States.[1][2] An attempt to confirm the discovery, however, failed. In 2007 a team at the Geneva Observatory concluded that the claimed planet does not, in fact, exist.[3] Konacki issued a response to this, claiming that the precision of the follow-up measurements was not in fact sufficient to confirm or deny the planet's existence.[4] Further observations of this system are planned over the course of 2007.
[edit] Radial velocity
The claimed planet, a gas giant slightly more massive than Jupiter, is thought to orbit the main star of the HD 188753 system (HD 188753A), in the constellation Cygnus. The stellar trio (yellow, orange, and red) is about 149 light-years from Earth. The claimed planet is at least 14% more mass than Jupiter, orbiting the main star (HD 188753 A) once every 80 hours or so (3.3 days), at a distance of about 8 Gm, a twentieth of the distance between Earth and the Sun. It is a Hot Jupiter, similar to HD 209458b.
[edit] See also
[edit] References
- ^ Access : The triple sunset that should not exist : Nature News
- ^ JPL.NASA.GOV: News Releases
- ^ [astro-ph/0702574] No evidence of a hot Jupiter around HD 188753 A
- ^ Maciej Konacki, Home Page
- Konacki M (2005). "An extrasolar giant planet in a close triple-star system". Nature 436 (7048): 230–3. doi:. PMID 16015323.
- Hatzes AP, Wuchterl G (2005). "Astronomy: giant planet seeks nursery place". Nature 436 (7048): 182–3. doi:. PMID 16015311.
- Eggenberger A, Udry S, Mazeh T, Segal Y, Mayor M. "No evidence of a hot Jupiter around HD 188753 A". astro-ph/070252.
