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

From: Jerry <grf2_at_meteoritecentral.com>
Date: Fri, 09 Nov 2007 17:08:54 -0500
Message-ID: <DFA858EB4C45410CB43E62FF8ED83240_at_Notebook>

WOW. Glad you reposted this!
Jerry Flaherty
----- Original Message -----
From: <lebofsky at lpl.arizona.edu>
To: <lebofsky at lpl.arizona.edu>
Cc: "Jerry" <grf2 at verizon.net>; "Meteorite Mailing List"
<meteorite-list at meteoritecentral.com>; "Ron Baalke"
<baalke at zagami.jpl.nasa.gov>
Sent: Friday, November 09, 2007 12:24 PM
Subject: Re: [meteorite-list] Did a Collision Cause Comet
17P/Holmes'MysteriousOutburst?


> 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 05:08:54 PM PST