Comet ISON, C/2012 S1 (ISON): April 18, 2013 Update. Past Jupiter Approaching Outskirts Of Main Asteroid Belt.


Anura Guruge

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Position on April 18, 2013 per JPL database. Click to access JPL database.

Position on April 18, 2013 per JPL database. Click to access JPL database.

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.

The densely packed white dots represent the main asteroid belt.

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.



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About Anura Guruge

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5 responses to “Comet ISON, C/2012 S1 (ISON): April 18, 2013 Update. Past Jupiter Approaching Outskirts Of Main Asteroid Belt.”

  1. robert says :

    thanks for the good information, do you possibly know when comet ison will be visible to naked eye and have a tail,,and what direction of the sky should we see it? near the north star? thank you very much.

    • aguruge says :

      It will be naked eye visible in October. Should have a tail or two by then. I have the entire observational schedule in my eBook. Why didn’t you get it while I was giving it away for FREE — till last night. No it won’t be near the North Star. It will start off in Leo.

  2. Kurt says :

    Is ICON capable of disrupting the sun to the extent that planet earth could be hit by a something like the Carrington event?

    • aguruge says :

      ISON as you know is a sungrazer. Quite a few times there have been corneal mass ejections (CMEs) from the Sun as a sungrazer is approaching the Sun. CMEs have also been known to occur when non-sungrazers, e.g., C/2010 X1 (Elenin), the ‘Doomsday comet of 2011’, was approaching perihelion. Astronomers are adamant that these CMEs are but coincidences. They do have a point. Comets, in the scheme of things, are small and as such have ‘insignificant’ mass. So it is a bit like a fly buzzing an elephant. But, out there in space anything is possible. Comets don’t even crash into the Sun per se. They get zapped by the heat. So that is the ‘official’ line. Hope that helps. Thanks. Anura

  3. Anonymous says :

    Is there a cover up about Comet Ison as it passes by earth’earth quakes’tunaumis and fragmements being pushed by the comet out of the kiper asteroid belt?planet xanother solar system comming in to ours.That’s why asteroids are hitting Russia and more are being spotted all over in the southern hemisphere of the earth.Another meteor streaking of the coast of california?Are we being told the truth.why would they stir the pot?why has the government been building bunkers for the past fifty years? It would start a lot of panic that’s why!Have you noticed the tempeture changes Alaska is as hot as the virgin islands and New england is colder than Alaska 54 degrees for a day time high .point being ….objects from space effect earth period, do your research folks.

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