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Old 28-02-2013, 05:23 PM
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mithrandir (Andrew)
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Quote:
Originally Posted by carl37 View Post
That's a very cool graphic Andrew - I like it!

That looks about right using the MPC/JPL ephemeris, but my link a few posts ago is to a blog post by Leonid Elenin in which he states he has made new calculations including a further 6 days of observation arc.

These have not been published at the MPC yet, which is where the JPL data comes from.

Carl
Carl,

from JPL I get:

Code:
 EC= 1.000076483324882E+00 QR= 1.399572296215722E+00 IN= 1.290158988346881E+02
 OM= 3.009529751244577E+02 W = 2.438725831780988E+00 Tp=  2456956.205760196317
Using find_orb with all the observations in MPEC (last entries are in K13D50) I get mag 5.9 and:

Code:
 EC= 1.0001012017          QR= 1.3995560557          IN= 129.01549809
 OM= 300.95223725          W = 2.43718722            Tp=  2456956.189119
From 133 observations 2012 Dec. 8-2013 Feb. 20; RMS error 0.519 arcseconds.

Unfortunately find_orb won't generate an ephemeris with the necessary number of digits of precision to generate the graph. Trying those MPEC numbers in Starry Night it generates closest approach at 2014-10-19 23:21 UTC and 348526 km.
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