MPEC 2011-M31 was issued today with revised elements for C/2011 L4. The
inclination is indicated as 93.71, yet my own calculations with Find_Orb show
i=84.92+/-0.78. Likewise, the MPC gives the time of perihelion as 2013 Mar
26.4, yet Find_Orb computes 2013 Mar 11.6+/-1.4.

While I believe the MPC weights the astrometry according to observing site, it's
hard to imagine that there could be such a difference between the two sets of
calculations.

Anyone have an independent estimate of the inclination and perihelion date?

Andrew
http://members.shaw.ca/andrewlowe/home.htm