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- Gravitational_keyhole abstract "A gravitational keyhole is a tiny region of space where a planet's gravity would alter the orbit of a passing asteroid such that the asteroid would collide with that planet on a given future orbital pass. The word \"keyhole\" contrasts the large uncertainty of trajectory calculations (between the time of the observations of the asteroid and the first encounter with the planet) with the relatively narrow bundle(s) of critical trajectories. The term was coined by P. W. Chodas in 1999. It gained some public interest when it became clear, in January 2005, that the Asteroid (99942) Apophis would miss the Earth in 2029 but may go through one or another keyhole leading to impacts in 2036 or 2037. Further research has since been done, however, which revealed the probability of the asteroid passing through the keyhole was extremely insignificant.Keyholes for the nearer or farther future are named by the numbers of orbital periods of the planet and the asteroid, respectively, between the two encounters (for example “7:6 resonance keyhole”). There are even more but smaller secondary keyholes, with trajectories including a less close intermediate encounter (bank shots). Secondary gravitational keyholes are searched for by importance sampling: Virtual asteroid trajectories (or rather their ‘initial’ values at the time of the first encounter) are sampled according to their likelihood given the observations of the asteroid. Very few of these virtual asteroids are virtual impactors.".
- Gravitational_keyhole wikiPageExternalLink 1999BAAS...31R1117C.
- Gravitational_keyhole wikiPageExternalLink tumblingstone.
- Gravitational_keyhole wikiPageExternalLink 3040.pdf.
- Gravitational_keyhole wikiPageID "14000306".
- Gravitational_keyhole wikiPageLength "6694".
- Gravitational_keyhole wikiPageOutDegree "23".
- Gravitational_keyhole wikiPageRevisionID "672677257".
- Gravitational_keyhole wikiPageWikiLink 99942_Apophis.
- Gravitational_keyhole wikiPageWikiLink Asteroid.
- Gravitational_keyhole wikiPageWikiLink Asteroid_impact_avoidance.
- Gravitational_keyhole wikiPageWikiLink Category:Asteroids.
- Gravitational_keyhole wikiPageWikiLink Category:Orbits.
- Gravitational_keyhole wikiPageWikiLink Celestial_mechanics.
- Gravitational_keyhole wikiPageWikiLink Confidence_region.
- Gravitational_keyhole wikiPageWikiLink Ernst_Öpik.
- Gravitational_keyhole wikiPageWikiLink Glossary_of_cue_sports_terms.
- Gravitational_keyhole wikiPageWikiLink Gravity_anomaly.
- Gravitational_keyhole wikiPageWikiLink Gravity_assist.
- Gravitational_keyhole wikiPageWikiLink Image_(mathematics).
- Gravitational_keyhole wikiPageWikiLink Importance_sampling.
- Gravitational_keyhole wikiPageWikiLink Impulse_(physics).
- Gravitational_keyhole wikiPageWikiLink Initial_value_problem.
- Gravitational_keyhole wikiPageWikiLink Interplanetary_Transport_Network.
- Gravitational_keyhole wikiPageWikiLink Likelihood_function.
- Gravitational_keyhole wikiPageWikiLink Magnitude_(astronomy).
- Gravitational_keyhole wikiPageWikiLink Orbital_resonance.
- Gravitational_keyhole wikiPageWikiLink Roche_limit.
- Gravitational_keyhole wikiPageWikiLink Semi-major_axis.
- Gravitational_keyhole wikiPageWikiLink Tidal_force.
- Gravitational_keyhole wikiPageWikiLink Yarkovsky_effect.
- Gravitational_keyhole wikiPageWikiLinkText "Gravitational keyhole".
- Gravitational_keyhole wikiPageWikiLinkText "gravitational keyhole".
- Gravitational_keyhole wikiPageUsesTemplate Template:Asteroids.
- Gravitational_keyhole wikiPageUsesTemplate Template:DOI.
- Gravitational_keyhole wikiPageUsesTemplate Template:More_footnotes.
- Gravitational_keyhole wikiPageUsesTemplate Template:Reflist.
- Gravitational_keyhole subject Category:Asteroids.
- Gravitational_keyhole subject Category:Orbits.
- Gravitational_keyhole hypernym Region.
- Gravitational_keyhole type Settlement.
- Gravitational_keyhole type Astrodynamic.
- Gravitational_keyhole comment "A gravitational keyhole is a tiny region of space where a planet's gravity would alter the orbit of a passing asteroid such that the asteroid would collide with that planet on a given future orbital pass. The word \"keyhole\" contrasts the large uncertainty of trajectory calculations (between the time of the observations of the asteroid and the first encounter with the planet) with the relatively narrow bundle(s) of critical trajectories. The term was coined by P. W. Chodas in 1999.".
- Gravitational_keyhole label "Gravitational keyhole".
- Gravitational_keyhole sameAs Q945126.
- Gravitational_keyhole sameAs Gravitational_keyhole.
- Gravitational_keyhole sameAs Gravita_serurtruo.
- Gravitational_keyhole sameAs Trou_de_serrure_gravitationnel.
- Gravitational_keyhole sameAs חור_מנעול_גרביטציוני.
- Gravitational_keyhole sameAs Gravitációs_kulcslyuk.
- Gravitational_keyhole sameAs Fenda_de_ressonância_gravitacional.
- Gravitational_keyhole sameAs m.03cqlyq.
- Gravitational_keyhole sameAs Q945126.
- Gravitational_keyhole sameAs 重力鎖眼.
- Gravitational_keyhole wasDerivedFrom Gravitational_keyhole?oldid=672677257.
- Gravitational_keyhole isPrimaryTopicOf Gravitational_keyhole.