[meteorite-list] Planet V (for Five)
From: David Weir <dgweir_at_meteoritecentral.com>
Date: Sun Apr 30 13:42:55 2006 Message-ID: <445250CB.2020300_at_earthlink.net> Sterling K. Webb wrote: > Maybe it hit Planet V-for-Five. Maybe it WAS > Planet V-for-Five or a good chunk of it. Or a satellite of Planet > V-for-Five dragged along for the ride when its > orbit became unstable. Or... I look at my little chunks of mesosiderite > with new respect. I sidle up to them at the bar and buy them a drink in > the hope that they will tell me their life story... Sterling, It may be just another one of those O-isotope coincidences, like the fact that E chondrites have O-isotopic values that are indistinguishable from those of the Earth, or that brachinites have values that are identical to the HEDs, but a new O-isotope study by Greenwood et al. (http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1768.pdf) of numerous mesosiderites demonstrates that their oxygen isotopic values are almost identical to those of the HED clan, which suggests that there may be a genetic link between them. The results suggest that both HEDs and mesosiderites may be derived from Vesta; or, if you want to speculate like me - I think the arrival of Dawn (in Sept. 2011) will reveal that HED and MES meteorites were derived from a separate, significantly disrupted, Vesta-like PB. This latter possibility may leave the door open for a possible Planet V origin for these two groups. David Received on Fri 28 Apr 2006 01:28:43 PM PDT |
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