HED meteorite

The HED meteorites are a group of achondrite meteorite types: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
 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 radioisotope ratios.

References

Category:Meteorites