[meteorite-list] Russian meteor composition

From: Dennis Miller <astroroks_at_meteoritecentral.com>
Date: Sat, 16 Feb 2013 14:57:19 -0700
Message-ID: <BAY405-EAS7F7E01C2D9A74A5C87D0CB10D0_at_phx.gbl>

The Science Channel is airing a special on the Russian meteorite event, tonight at 8:00PM.
Dennis

Sent from my iPhone

On Feb 16, 2013, at 2:51 PM, "Galactic Stone & Ironworks" <meteoritemike at gmail.com> wrote:

> Hi Rob and List,
>
> Good points, and some of those same thoughts had crossed my mind.
> Namely, where are the meteorites? If this had been a Sikhote Alin
> type of fall, we would have seen many meteorites recovered by now.
> Bogus eBay-offerings aside, nothing has been recovered yet - or, if
> any recoveries have been made, they have not been publicly announced.
>
> Is there spectral data on this object? And if so, can someone provide a link?
>
> Best regards,
>
> MikeG
>
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>
> On 2/16/13, Rob Matson <mojave_meteorites at cox.net> wrote:
>> Hi All,
>>
>> Getting back to the Russian meteor itself, what I find most surprising so
>> far is
>> that after two full days of daylight hours to search for fragments against
>> a
>> fairly white background, not one meteorite has been found. The prevailing
>> wisdom ~had~ been that this was an iron, given the deep penetration and
>> seemingly minimal deceleration. But with nothing found so far -- in spite
>> of
>> the relatively low entry velocity, shallow trajectory, and huge initial mass
>> --
>> I begin to question that initial compositional assumption. Maybe this was
>> closer to Tunguska-like than it was Sikhote-Alin-like (i.e. cometary). That
>> said, the initial estimate of the orbit doesn't appear to be very
>> comet-like
>> (low semi-major axis). The period is lower than that of even 2P/Encke.
>>
>> --Rob
>>
>>
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Received on Sat 16 Feb 2013 04:57:19 PM PST