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Topic: Coincidence of meteor strike and close asteroid approach at same time.
Replies: 36   Last Post: Oct 4, 2013 6:26 PM

 Messages: [ Previous | Next ]
 Robert Clark Posts: 68 Registered: 12/13/04
Re: Coincidence of meteor strike and close asteroid approach at same time.
Posted: Mar 6, 2013 12:27 PM

On Feb 28, 2:38 pm, Robert Clark <rgregorycl...@yahoo.com> wrote:
...
>  If there is an association with the 2012 DA14 asteroid, then since
> it  has approximately a year long orbit, this could explain why the
> fireballs  are seen frequently in February. Note it was discovered
> last year in February also during a close approach.
> ...

On Mar 5, 11:31 am, Robert Clark <rgregorycl...@yahoo.com> wrote:
> Speculation here that such an impact could make Mars habitable:
>
> Rush to Mars: Comet impact could make Red Planet inhabitable.
> Published time: February 28, 2013 16:32
> http://rt.com/news/mars-comet-tito-flyby-601/
>
>   Bob Clark

Assuming comet C/2013 A1 misses Mars by 37,000 km how much delta-v
would you need to nudge it to hit Mars?

This might not be purely of academic interest. Already we've seen two
Earth encounters whose likelihood together was one in hundreds of
millions.

This comet to make a close encounter to Mars is *huge*. To put it
perspective it dwarfs the asteroid that destroyed the dinosaurs. Such
close encounters to any of the terrestrial planets must be very rare.

For instance the puny, in comparison, asteroid 2012 DA14 would be
expected to get so close to the Earth once in 40 years. That such a
large comet would get so close to Mars must be much rarer than this.
So the chance is less than 1 in 40 in a year. Say it happens for
either of two planets; that's a chance of less than 1 in 20 in a year.
Say then it happens within a 2 year period; that's 1 chance in 10.

Now the chance of the three encounters occurring within such a close
time span is greater than one in several billion. The unlikelihoods
begin piling up greater and greater.

Then we are left with the disturbing possibility there is a physical
phenomenon causing these large, close encounters. And the possibility
arises there is another large, close encounter to the Earth that may
be upcoming.

It would really become important to know then not what's the delta-v
needed to turn a close miss to an impact, but in fact the reverse.

Bob Clark

Date Subject Author
2/19/13 Robert Clark
2/20/13 David Bernier
2/20/13 Richard Tobin
2/20/13 Jeff Findley
2/20/13 Robert Clark
2/20/13 Robert Clark
2/23/13 Robert Clark
2/23/13 Robert Clark
2/27/13 Robert Clark
2/28/13 Robert Clark
10/3/13 David Staup
10/3/13 Mike Collins
10/4/13 David Staup
10/4/13 Mike Collins
2/28/13 Davoud
2/28/13 Robert Clark
2/28/13 Greg \(Strider\) Moore
3/6/13 Robert Clark