What is HED meteorite?
[[Image:JohnstownDiogenite.jpg|thumb|200px|right|Diogenite]] The '''HED meteorites''' are a group of [[achondrite]] meteorite types:<ref>http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1502.pdf OLIVINE DIOGENITE NWA 1459: PLUMBING THE DEPTHS OF 4 VESTA, A.J. Irving et al. 2003. Lunar and Planetary Science XXXIV</ref> * ''Howardites'' * ''Eucrites'' * ''Diogenites'' These are all thought to have come from the crust of the [[asteroid]] [[4 Vesta]]. Their differences are due to different geologic histories of the parent rock. Their crystallization ages are between 4.43 and 4.55 billion years ago, by their [[radionuclide|radioisotope]] ratios. ==References== {{Reflist}} {{sci-stub}} [[Category:Meteorites]]