WASP-8
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 23h 59m 36.070s[1] |
| Declination | −35° 01′ 52.92″[1] |
| Apparent magnitude (V) | 9.9 |
| Characteristics | |
| Spectral type | G6 |
| Astrometry | |
| Proper motion (μ) | RA: 110.4 ± 1.0[1] mas/yr Dec.: 9.8 ± 1.1[1] mas/yr |
| Distance | 284 ± 23[2] ly (87 ± 7[2] pc) |
| Details | |
| Mass | 0.93 M☉ |
| Radius | 0.93 R☉ |
| Luminosity | 0.79 L☉ |
| Temperature | 5600 K |
| Age | 3–5[2] Gyr |
| Other designations | |
WASP-8 is a magnitude 9.9 main sequence yellow dwarf star. It is reported to be a G type star of temperature 5600 K, mass of 0.93 solar masses, radius of 0.93 solar radius, and a luminosity of 0.79 of solar luminosity.
Planetary system
The star is orbited by two known extrasolar planet, designated WASP-8b and WASP-8c. They was cataloged as part of the SuperWASP mission and discovered by the astronomical transit method.[2] WASP-8c has the longest orbital period of any exoplanet discovered by WASP with a period of 4,323 days, over 400 times the period of the second furthest planet, WASP-117b with a period of 10.02 days.
Measurements of WASP-8b's radius and mass give it an estimated density of 2.53 g/cm3, about twice the density of Jupiter
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.23 MJ | 0.0793 | 8.16 | 0.3082 | 88.52° | 1.17 RJ |
| c | 9.45 MJ | 5.28 | 4323 | — | — | — |
See also
References
- ↑ 1.0 1.1 1.2 1.3 Zacharias, N. et al. (2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal 145 (2). 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44.Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Queloz, D. et al. (2010). "WASP-8b: a retrograde transiting planet in a multiple system". Astronomy and Astrophysics 517. L1. arXiv:1006.5089. Bibcode:2010A&A...517L...1Q. doi:10.1051/0004-6361/201014768.
- ↑ "NAME WASP-8 A -- Star in double system". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-29.
External links
- WASP planets
- "Notes for star WASP-8". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-07.
Coordinates: 
23h 59m 36.07s, −35° 01′ 52.9″
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