Extrasolar planet List of extrasolar planets
Size comparison of WASP-8b with Jupiter.
Parent star

<tr> <td colspan="2">Star</td> <td>WASP-8</td></tr><tr> <td colspan="2">Constellation</td> <td>Sculptor</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>23h 59m 36.07s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−35° 01′ 52.9″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>9.9</td></tr><tr><td colspan="2">Distance</td><td>160 ly
(49 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.00+0.02

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0793 AU</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>8.16 d</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>2.23 MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.17 Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>1.85[1] g cm-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>4.30 g</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>950 (varies)[2] K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 1, 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Cameron et al. (SuperWASP)</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</td></tr>

WASP-8b is an extrasolar planet discovered (with their stars) in the SuperWASP batch -6b to -15b. On 1 April 2008, Dr. Don Pollacco of Queen’s University Belfast announced them at the RAS National Astronomy Meeting (NAM 2008).[3]

At 49 parsecs away, this system is the closest of the WASP-discovered systems: closer to Earth than are HD 17156 and HD 149026. It is denser than Jupiter. If it were possible to stand on its surface, one would experience a gravitational pull of approximately Template:Fracg, resulting in difficulty breathing and eventual brain damage.

The planet orbits retrograde.[4][5]

The equilibrium temperature is 950 K, but this oscillates due to eccentricity.[2]

See alsoEdit


  1. Density is calculated from the mass and the radius, assuming a circular disc of eclipse relative to the Earth.
  2. 2.0 2.1 Patricio Cubillos et al., "The Characterization of the Cool and Eccentric Exoplanet WASP-8b with Spitzer" in DPS Annual Meeting session "103.Extrasolar Planets: Atmospheric Chemistry and Characterization" (Monday, Oct 15, 2012, 11:40 AM -11:50 AM).
  3. THE (SUPER)WASP FACTORY FINDS 10 NEW PLANETS IN THE LAST 6 MONTHS (2008). Retrieved 2009-05-13.
  4. European Southern Observatory. Artist’s impression of an exoplanet WASP 8b in a retrograde orbit.
  5. (2010). WASP-8b: a retrograde transiting planet in a multiple system. Astronomy and Astrophysics 517: L1.

External linksEdit


Coordinates: Sky map 23h 59m 36.07s, −35° 01′ 52.9″de:WASP-8 b

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