Equivalent to 1,800 tonnes of TNT: what we now know about the meteor that lit up the daytime sky above New Zealand

Wed, 3 Aug 2022 11:05:22 +1000

Andrew Pam <xanni [at] glasswings.com.au>

Andrew Pam
<https://theconversation.com/equivalent-to-1-800-tonnes-of-tnt-what-we-now-know-about-the-meteor-that-lit-up-the-daytime-sky-above-new-zealand-186636>

"Meteorites hit New Zealand three or four times a year, but the fireball that
shot across the sky above Cook Strait last week was unusual.

It had the explosive power of 1,800 tonnes of TNT and was captured from space
by US satellites. It set off a sonic boom heard throughout the southern parts
of the North Island.

Witnesses described a “giant bright orange fireball” and a flash that left a
“trail of smoke that hung around for a few minutes”.

The fireball was most likely caused by a small meteor, up to a few metres in
diameter, traversing Earth’s atmosphere. It was one of only five impacts of
greater than a thousand tonnes of energy globally in the past year. Most
meteors are tiny, creating “shooting stars” that only briefly skim the
atmosphere.

The fragmentation of the meteor produced a shock wave strong enough to be
picked up by GeoNet, a network of earthquake seismometers, with a flash bright
enough to be recorded by a global lightning-tracking satellite. The
Metservice’s Wellington radar picked up the leftover smoke trail south of the
tip of the North Island.

But what is the chance of finding any of the its fragments, or meteorites, that
dropped to Earth?"

Cheers,
       *** Xanni ***
--
mailto:xanni@xanadu.net               Andrew Pam
http://xanadu.com.au/                 Chief Scientist, Xanadu
https://glasswings.com.au/            Partner, Glass Wings
https://sericyb.com.au/               Manager, Serious Cybernetics

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