WASP-4
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Star WASP-4 |
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| AladinLite | |||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Phoenix | ||
| Right ascension | 23 h 34 m 15.06 s | ||
| declination | -42 ° 03 ′ 41.1 ″ | ||
| Apparent brightness | 12.6 mag | ||
| Typing | |||
| Known exoplanets | 1 | ||
| Spectral class | G7V | ||
| Astrometry | |||
| distance | 850 ly 260.5 pc |
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| Physical Properties | |||
| Dimensions | 0.9 (± 0.07) M ☉ | ||
| radius | 1.15 (± 0.28) R ☉ | ||
| Luminosity |
12.6 L ☉ |
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| Effective temperature | 5500 (± 150) K | ||
| Metallicity [Fe / H] | 0 (± 0.2) | ||
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Other names and catalog entries |
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WASP-4 is the name of one of the sun 260.5 Parsecs (approximately 850 light-years ) distant star, that of a Exoplaneten is encircled. The star in the constellation Phoenix is of the spectral type G7V and has an apparent magnitude of 12.6. With a surface temperature of approx. 5600 K, the star is similar to the sun.
The planet
Main article: WASP-4 b
Due to the large number of newly found, extrasolar planets, newly discovered companions are no longer given proper names. Therefore the planet orbiting WASP-4 is simply called “b”, that is, WASP-4b. WASP-4b has at least 1.34 masses of Jupiter, about one and a half times the radius of Jupiter and takes 1.34 days to orbit its star. Since direct observation of the planet is impossible with today's technical means due to the great distance and the great difference in brightness from its star, most sizes are minimum or maximum sizes. The distance of the planet to its star, which corresponds to about 2.3% of the distance that the earth has from the sun, is a result of the data and not a directly observed quantity.
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