[meteorite-list] re: meteorite lands near Mt. Fuji Japan

From: E. L. Jones <jonee_at_meteoritecentral.com>
Date: Fri Aug 19 23:29:33 2005
Message-ID: <4306A397.1080708_at_epix.net>

Dirk can add to this as he wishes, however Mt Fuji is around
12,400ft?--(I walked up part of it and am still out of breath 2 years
later) Any trail falling below the near crest would indicate
incandescence below 12,000. (2miles?) and would be sufficient for
estimating 10k ft.

 Somewhere, I read that active incandescence can't exist below 5 miles
as the air is too dense for your typical meteoroid to maintain
incandescence generating velocity I however, observed a bolide that may
have exploded at certainlky less than 4 and possibly around 3 miles
using artillery observer methods and from which a 2kg meteorite was
recovered. So I am not sure how valid the 5 mile barrier is. I hope we
get some more data. Does anyone have a reference to altitudes where
incandescence is extinguished?

Recovering a meteorite from that vicinity is problematic owing that it
is a series of lava flows and part of it is a US Marine tank gunnery range.

Elton

Marco Langbroek wrote:

> Dirk, I am wondering: how can you know the end altitude? You have to
> triangulate photographs or video images taken from at least 2
> well-separated locations to know that. Also, this end altitude would
> be quite low for a meteorite, although not entirelly impossible.
>
> - Marco
>
> -----
> Dr Marco Langbroek
> Dutch Meteor Society (DMS)
Received on Fri 19 Aug 2005 11:29:27 PM PDT