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The SECCHI diagram is not using the most recent orbital elements for the comet. The JPL calculations are more accurate.
entered the asteroid belt, while it is in a rarefied part of it, near the far border. Due to the fact that the orbit of the comet is unique in its small inclination for long-period comets (the second example could be the comet C/2007 N3 (Lulin), it was decided to calculate the close encounters of the comet with the main belt asteroids. Search encounters held on the interval from 18 February to 18 June 2011, with the help of software package ArtemisSIMULATOR. Refine approach distances were held in the program EPOS. As a result, 4 were found convergence: - 28 February 1999 with the asteroid TV67, distance 1,774,707 km (0.012 AU); - April 7, with the asteroid 4336 Jasniewicz, distance of 1,119,713 km (0.008 AU); - April 19, with the asteroid 2009 TJ9, distance 325,428 km (0.002 AU); - May 20, with the asteroid 1999 RQ176, distance 338,403 km (0.002 AU) Of particular interest are the last two flights, astroid will pass through a sufficiently dense dust tail of a comet. Perhaps we will be able to capture the data closer to using large telescopes. Determine the influence of gravitational perturbations of a comet to an asteroid, using ground-based optical observations, unfortunately not succeed.
No at present its estimated 20 million 460,000 miles on closest but has changed by factors of 0.02 Au`s each month,so estimating 9 months of 0.02 au changes =minus 0.18 AU`s from current and could be,could be remember 3 million 720,000 miles,remember this is a unqualified speculation at present and add coronal mass ejections,solar wind and ,well I will remain optimistic,but ...mmm Really its some way to do with distance but comets are know to be the wandering objects and when closest to sun can on cme`s ,wildly angle of at tangents ,completly changing its trajectory away from the sun towards the earth equator as its on the same plane on its ecliptic away from the sun ssd.jpl.nasa.gov... Asteroid YU55 will be 0.0022 au`s 204,,600 miles from earth and is 1340 metres wide speeding in at 34,000mph.The 9th of november is its closest to earth and moon ssd.jpl.nasa.gov... og=0;cad=0#orb click the fast forward radial and see where it is on the 9th,yep two green dots merge.I hope that clears up any confusion.