[meteorite-list] Did a Collision Cause Comet 17P/Holmes'MysteriousOutburst?

From: lebofsky at lpl.arizona.edu <lebofsky_at_meteoritecentral.com>
Date: Fri, 9 Nov 2007 10:24:11 -0700 (MST)
Message-ID: <1557.128.196.250.86.1194629051.squirrel_at_timber.lpl.arizona.edu>

Hi List:

I am trying this again since my previouys forward did not appear to go
through.

On November 13, this newly-discovered asteroid (only about 20 meters
diameter) will pass within 2 Earth radii of the CENTER of the Earth (that
is close). It will be 9th magnitude (about 50-100 times too faint to see
with the naked eye), but show be observable with a small telescope (if it
is night where you are when it comes by and you know were to look).

Go to the cfa.harvard site for coordiantes, etc. I can interpret columns
if you are interested.

I am sure there will be more about this in the coming days.

LArry

Begin forwarded message:

> From: Alan W Harris <awharris at spacescience.org>
> Date: November 8, 2007 5:15:19 PM MST
> To: "Peter Birtwhistle" <peter at birtwhi.demon.co.uk>
> Cc: mpml at yahoogroups.com
> Subject: Re: {MPML} 2007 VN84 incoming
>
> 2007 VN84 is significant in that it not only comes closer, it is much
> bigger, around 20 m in diameter, compared to 2004 FU162 only about
> 1/3 that
> size. Based on our recent population estimates, we expect an object
> the
> size of 2004 FU162 to pass within a couple Earth radii about once a
> year,
> and to actually impact (actually, blow up in the upper atmosphere)
> about
> once in five years, so the only thing unusual about 2004 FU162 is
> that we
> saw it as it passed by. 2007 VN84, on the other hand, is so large
> that we
> expect omething that big to come as close as 2 radii only about
> once in 20
> years, so it is a remarkable event in itself, in addition to the
> fact that
> it was discovered and can be watched flying by. Congratulations to
> Richard
> Kowalski and the Catalina Sky Survey.
>
> Cheers,
>
> Alan
>
> P.S. I second his request and interest for a lightcurve, but it
> will be a
> real challeng on account of its rate of motion. Plenty bright
> enough, but
> really truckin'.
>
> At 03:57 PM 11/8/2007, Peter Birtwhistle wrote:
> >Take a look at MPEC 2007-V69 just announced...
> >
> >http://www.cfa.harvard.edu/mpec/K07/K07V69.html
> >
> >"The minimum distance from the geocenter is 0.000081 AU (1.89 Earth
> >radii) on Nov 13.844 UT"
> >
> >just beating the previous record close approach of 2004 FU162, but
> >this time we have 5 days lead time.
> >
> >Peter

>
> *******************************************************************
> Alan W. Harris
> Senior Research Scientist
> Space Science Institute
> 4603 Orange Knoll Ave. Phone: 818-790-8291
> La Canada, CA 91011-3364 email: awharris at SpaceScience.org
> *******************************************************************
>
>
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Received on Fri 09 Nov 2007 12:24:11 PM PST