After adding the recent measurements, taken by Tomas Vorobjov at Kitt Peak Observatory (March 1, 2013), the distance of closest approach increased to 0.00047 AU (70 500 km). CA time is October 19, 2014, 19:09:24.48 UT. I think what we can fairly accurately estimate these parameters, before the temporary pause in the observations of this comet, due to it’s low elongation. Thanks to Tomas!
If anyone have recent measurements of this comet, I will appreciate if you will send it to me. TIA!