C/2010 X1 (Elenin)
Perihelion 2012 Jan 27.983941 TT; Constraint: e=0.45
Epoch 2010 Dec 17.0 TT = JDT 2455547.5 Ju: 0.1610 Sa: 0.3175
M 344.53277 (2000.0) P Q
n 0.03800449 Peri. 252.05467 -0.83638346 0.54788235
a 8.76151834 Node 321.16234 -0.49212478 -0.76417207
e 0.4530590 Incl. 1.54966 -0.24140401 -0.34039090
P 25.93 M(T) 8.6 K 10.0 q 4.79203343 Q 12.7310032
From 61 observations 2010 Dec. 10-17; RMS error 0.918 arcseconds
or even (but less likely, since it should have been found earlier):
C/2010 X1 (Elenin)
Perihelion 2010 May 11.199701 TT; Constraint: e=1
Epoch 2010 Dec 17.0 TT = JDT 2455547.5 Ju: 0.0681 Sa: 0.5178 Ur: 0.4231
q 5.31921545 (2000.0) P Q
M(T) 8.3 K 10.0 Peri. 185.45762 -0.83149409 -0.55528612
Node 320.79703 0.51067933 -0.75226971
e 1.0 Incl. 1.50307 0.21868742 -0.35460906
From 58 observations 2010 Dec. 10-17; RMS error 0.876 arcseconds
http://spaceobs.org/en/2010/12/13/c2010-x1-elenin-wj08b04/=>
http://familystar.org.tw/component/option,com_smf/Itemid,45/topic,13001.0