Månens gravitasjonsfelt

Radial gravitetsanomali på overflaten av månen angitt i gal.

Månens gravitasjonsfelt har blitt bestemt etter sporing av radiosignaler sendt fra romsonder i bane rundt månen. Prinsippet som er brukt avhenger av Dopplereffekten, hvorved akselerasjonen til romsondene i en siktlinje kan måles ved små endringer i frekvensen til radiosignalet, og målingen av avstanden fra romsonden til en stasjon på jorden. Siden månens gravitasjonsfelt påvirker banen til et romfartøy, er det mulig å bruke disse sporingsdataene til å invertere for gravitetsanomalier. På grunn av månens bundne rotasjon er det imidlertid ikke mulig å spore romsonder over randen av månen, og baksidens gravitasjonsfelt er derfor lite kjent. Tyngdens akselereasjon på månens overflate er 1,6249 m/s², ca. 16,7 % av den på jordens overflate.[1] Over hele overflaten varierer tyngdekraften med ~0.0253 m/s² (1,6 & av tyngdekraftakselerasjonen). Fordi vekt er direkte avhengig av tyngdekraftakselerasjonen, vil ting på månen bare veie 16,7 % av hva de veier på jorden.

Referanser

  1. ^ C. Hirt and W. E. Featherstone (2012). «A 1.5 km-resolution gravity field model of the Moon». Earth and Planetary Science Letters. 329–330: 22–30. Bibcode:2012E&PSL.329...22H. doi:10.1016/j.epsl.2012.02.012. 

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