Since this rock wasn't seen till it passed the earth and was effected by the earth's (and moon's) gravity then how close can you come to calculating it's original orbit? There could be many solutions of incoming orbits to produce the outgoing orbit. We can't know the original orbit.
Henry Spencer wrote: > On 21 Jun 2002, Sean R. Lynch KG6CVV wrote: > > It's not a matter of seeing the object "as it's approaching," but of > > discovering PHAs and characterizing their orbits well enough to be able > > to find potential impacts... > > There is one class of PHAs which will have to be seen as they approach: > long-period comets simply don't come around the Sun repeatedly in any > reasonable amount of time. They are a particularly ugly case: short > warning times, awkward orbits which render rendezvous-based deflection > methods unworkable, and some possibility that one could have an orbit > which would put it near or behind the Sun in our sky until it was quite > close. > > > "The Watch" or Skyguard survey would need to run for centuries before it > > got a good fraction of the PHAs out there. > > This really isn't true. Quite a modest effort (tens of millions, not > billions, per year) could fairly quickly (a decade or two) nail down > essentially all the short-period comets and NEAs which are big enough to > threaten the entire planet or large portions of it, and over a somewhat > longer period could do a respectable job on the ones that are big enough > to have wide-area effects. Tunguska-sized things would take a lot longer, > yes, but they are not the big worry. The level of resources currently > invested in this stuff is really ridiculously small. > > Henry Spencer > [EMAIL PROTECTED] > > _______________________________________________ > ERPS-list mailing list > [EMAIL PROTECTED] > http://lists.erps.org/mailman/listinfo/erps-list -- >>>>>>>>>>>>>>>>----<<<<<<<<<<<<<<<<< ........ Alex Fraser N3DER ......... ......... [EMAIL PROTECTED] ....... [~]_>^</\-[~]_>^</\-[~]_>^</\-[~]_>^< _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
