WASP-2
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Star WASP-2 |
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|---|---|
| AladinLite | |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | dolphin |
| Right ascension | 20 h 30 m 54.1 s |
| declination | + 06 ° 25 ′ 46 ″ |
| Apparent brightness | 11.98 likes |
| Typing | |
| Known exoplanets | 1 |
| Spectral class | K1 V |
| Astrometry | |
| distance | approx. 420 ly approx. 130 pc |
| Visual absolute brightness M vis | approx. +6 mag |
| Physical Properties | |
| Dimensions | approx. 0.9 M ☉ |
| radius | approx. 0.8 R ☉ |
| Effective temperature | (5200 ± 200) K. |
WASP-2 is a star about 130 parsecs (around 420 light years ) away from the Sun and orbited by an exoplanet . It is located in the constellation Dolphin , is of the spectral type K1 V and has an apparent magnitude of 12 mag.
The planet
Due to the large number of newly found, extrasolar planets, newly discovered companions are no longer given proper names. Therefore the planet which orbits WASP-2 is simply called “b”, ie WASP-2b. WASP-2b has at least 88% of Jupiter's mass, has roughly the same radius as Jupiter, and takes a little more than two 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 3% of the distance that the earth has from the sun, is a result of the data and not a directly observed quantity.
literature
- Cameron et al .: WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE . In: Monthly Notices of the Royal Astronomical Society . 375, 2007, pp. 951-957. (Preprint arxiv : astro-ph / 0609688 )