WASP-4b
| Exoplanet | List of exoplanets | |
|---|---|---|
 | ||
| Parent star | ||
| Star | WASP-4 | |
| Constellation | Phoenix | |
| Right ascension | (α) | 23h 34m 15.06s[1] |
| Declination | (δ) | −42° 03′ 41.1″[1] |
| Apparent magnitude | (mV) | 12.5[2] |
| Distance | 1000 ± 160 ly (300 ± 50[2] pc) | |
| Spectral type | G7V[2] | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.02255+0.00095 −0.00065[3] AU |
| Eccentricity | (e) | 0.0[3] |
| Orbital period | (P) | 1.3382324+0.0000017 −0.0000029[3] d |
| Inclination | (i) | 89.35+0.64 −0.49[3]° |
| Time of transit | (Tt) | 2454383.313070+0.000045 −0.000074 HJD[3] |
| Semi-amplitude | (K) | 247.6+13.9 −6.8[3] m/s |
| Physical characteristics | ||
| Mass | (m) | 1.21+0.13 −0.08[3] MJ |
| Radius | (r) | 1.304+0.054 −0.042[3] RJ |
| Temperature | (T) | 1650 ± 30[3] |
| Discovery information | ||
| Discovery date | October 31, 2007[4] | |
| Discoverer(s) | David. M. Wilson et al. (SuperWASP) | |
| Discovery method | Transit | |
| Discovery site | SAAO | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
WASP-4b is an extrasolar planet approximately 1,000 light-years away in the constellation of Phoenix.[2] The planet was discovered orbiting the star WASP-4 in October 2007. The planet's mass and radius indicate that it is a gas giant, similar to Jupiter.[4] WASP-4b is close enough to its star to be classified as a hot Jupiter and has an atmospheric temperature of approximately 1650 K.[2][3]
The radial velocity trend of WASP-4, caused by the presence of WASP-4 b.
The planet was the discovered by the SuperWASP project using cameras in South Africa.[4] After its discovery, the mass of the WASP-4 b was determined by measuring the radial velocity of WASP-4, which confirmed that the object that caused the transit was a planet.
References
- 1 2 WASP-4, entry, SIMBAD. Accessed on line June 19, 2008.
- 1 2 3 4 5 WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere, David. M. Wilson et al., Astrophysical Journal Letters 675, #2 (March 2008), pp. L113–L116. Bibcode: 2008ApJ...675L.113W. doi:10.1086/586735.
- 1 2 3 4 5 6 7 8 9 10 Table 3, Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b, M. Gillon et al., Astronomy and Astrophysics 496, #1 (2009), pp. 259–267, doi:10.1051/0004-6361:200810929, Bibcode: 2009A&A...496..259G.
- 1 2 3 UK planet hunters announce three new finds, press release, WASP project. Accessed on line June 19, 2008.
External links
Media related to WASP-4b at Wikimedia Commons
- "SuperWASP Homepage". Retrieved 2008-07-02.
- "UK planet hunters announce three new finds" (PDF). 2007-10-30. Retrieved 2008-07-02.
Coordinates: 
23h 34m 15.06s, −42° 03′ 41.1″
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