Comet ISON, C/2012 S1 (ISON): April 18, 2013 Update. Past Jupiter Approaching Outskirts Of Main Asteroid Belt.
. by Anura Guruge
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So, Comet ISON is now 4.056 AU from the Sun.
So it has travelled 2.237 AU, 207.9 million miles since its discovery on Friday, September 21, 2012.
So that is 207.9 M miles in 209 days.
That is 0.995 million miles a day — and as shown in this post ISON’s speed continues to increase as it gets closer to the Sun. So its average speed since discovery has been around 41,000 miles per hour, or 11 miles per second.
Right now, ‘just past’ Jupiter it is on the very outskirts of the main asteroid belt. This diagram provides a good perspective as to where it is — using Jupiter’s orbit as a guide.
Here is a chart showing how the asteroids are distributed within the main belt — the lower axis showing the AU distance from the Sun. So the belt per se only really starts at around 3.25 AU. ISON won’t reach this edge till June. I will keep you updated.