Elements and Ephemeris for C/2012 S1 (ISON) Orbital Elements The following orbital elements are taken from MPC 84317: C/2012 S1 (ISON) Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 T 2013 Nov. 28.7627 TT MPC q 0.012472 (2000.0) P Q z -0.000393 Peri. 345.5357 +0.3145534 +0.5164899 +/-0.000002 Node 295.6956 -0.7592179 -0.3667239 e 1.000005 Incl. 62.1076 -0.5697757 +0.7737905 From 3722 observations 2011 Dec. 28-2013 June 8, mean residual 0".4. ;;IDL: tperi=anytim('2013/11/28')+86400.*.7627 - 66.184 & q=0.012472 & O=295.6956 & i=62.1076 & w=345.5357 & e=1 ;;OR: ;elements={tperi_ET_ccsds:anytim(anytim('2013/11/28')+86400.*.7627,/CCSDS),q:0.012472,e:1.000005,O:295.6956,i:62.1076,w:345.5357}