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- WASP-18b abstract "WASP-18b is an extrasolar planet that is notable for having an orbital period of less than one day. It has a mass equal to 10 Jupiter masses, just below the boundary line between planets and brown dwarfs, about 13 Jupiter masses. Due to tidal deceleration, it is expected to spiral towards and eventually merge with its host star, WASP-18, in less than a million years. The planet is approximately 3.1 million kilometres (1.9 million miles) from its star, which is about 325 light years from Earth. It was discovered by Coel Hellier, a professor of astrophysics at Keele University in England.Scientists at Keele and at the University of Maryland are working to understand whether the discovery of this planet so shortly before its expected demise (with less than 0.1% of its lifetime remaining) was fortuitous, or whether tidal dissipation by WASP-18 is actually much less efficient than astrophysicists typically assume. Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.The closest example of a similar situation in the Solar System is Mars's moon Phobos. Phobos orbits Mars at a distance of only about 9,000 km (5,600 mi), 40 times closer than the Moon is to the Earth, and is expected to be destroyed in about eleven million years.".
- WASP-18b thumbnail Exoplanet_Comparison_WASP-18_b.png?width=300.
- WASP-18b wikiPageID "24123147".
- WASP-18b wikiPageRevisionID "599828653".
- WASP-18b apastron "0.02045".
- WASP-18b appMag "9.29".
- WASP-18b argPeri "96".
- WASP-18b class "F9".
- WASP-18b constell Phoenix_(constellation).
- WASP-18b detectionMethods "Radial velocity".
- WASP-18b discoverers "Hellier et al.".
- WASP-18b discoveryDate "2009-08-27".
- WASP-18b discoveryMethod Transit_(astronomy).
- WASP-18b discoveryStatus "Published".
- WASP-18b distLy "330".
- WASP-18b distPc "100".
- WASP-18b eccentricity "0.0092".
- WASP-18b hasPhotoCollection WASP-18b.
- WASP-18b inclination "86".
- WASP-18b mass "1.25".
- WASP-18b minimumMass "10.3".
- WASP-18b periastron "0.02007".
- WASP-18b period "0.94145299".
- WASP-18b periodHour "22.59487".
- WASP-18b planet "b".
- WASP-18b radius "1.106".
- WASP-18b semimajor "0.02026".
- WASP-18b star WASP-18.
- WASP-18b star "WASP-18".
- WASP-18b tTransit "2454221.48163".
- WASP-18b subject Category:Exoplanets.
- WASP-18b subject Category:Exoplanets_discovered_in_2009.
- WASP-18b subject Category:Gas_giants.
- WASP-18b subject Category:Hot_Jupiters.
- WASP-18b subject Category:Phoenix_(constellation).
- WASP-18b subject Category:Transiting_exoplanets.
- WASP-18b comment "WASP-18b is an extrasolar planet that is notable for having an orbital period of less than one day. It has a mass equal to 10 Jupiter masses, just below the boundary line between planets and brown dwarfs, about 13 Jupiter masses. Due to tidal deceleration, it is expected to spiral towards and eventually merge with its host star, WASP-18, in less than a million years. The planet is approximately 3.1 million kilometres (1.9 million miles) from its star, which is about 325 light years from Earth.".
- WASP-18b label "WASP-18 b".
- WASP-18b label "WASP-18 b".
- WASP-18b label "WASP-18 b".
- WASP-18b label "WASP-18 b".
- WASP-18b label "WASP-18 b".
- WASP-18b label "WASP-18b".
- WASP-18b label "WASP-18b".
- WASP-18b label "WASP-18b".
- WASP-18b label "WASP-18b".
- WASP-18b label "WASP-18b".
- WASP-18b sameAs WASP-18_b.
- WASP-18b sameAs WASP-18b.
- WASP-18b sameAs WASP-18_b.
- WASP-18b sameAs WASP-18_b.
- WASP-18b sameAs WASP-18b.
- WASP-18b sameAs WASP-18b.
- WASP-18b sameAs WASP-18_b.
- WASP-18b sameAs WASP-18b.
- WASP-18b sameAs m.07k5fc9.
- WASP-18b sameAs Q1061955.
- WASP-18b sameAs Q1061955.
- WASP-18b wasDerivedFrom WASP-18b?oldid=599828653.
- WASP-18b depiction Exoplanet_Comparison_WASP-18_b.png.
- WASP-18b isPrimaryTopicOf WASP-18b.