[Rockhounds] Asteroid the size of a house set for near miss with Earth

[Paul]

Big asteroid to sweep close September
By Eddie Irizarry in Astronomy Essentials,  August 13, 2017
http://earthsky.org/astronomy-essentials/asteroid-1981-et3-3122-florence-pass-earth-2017-binoculars. 
Big asteroid to sweep close September
By Eddie Irizarry in Astronomy Essentials,  August 13, 2017
http://earthsky.org/astronomy-essentials/asteroid-1981-et3-3122-florence-pass-earth-2017-binoculars.
https://cneos.jpl.nasa.gov/news/news198.html

"Asteroid 3122 Florence is the biggest near-Earth
object to pass this close since this category of objects
was discovered over a century ago."

Close encounter: asteroid the size of a house set for
near miss with Earth Space rock 2012 TC4 expected
to zoom by harmlessly, coming within 27,300 miles –
an eighth of the distance from the Earth to the Moon
The Guardian, Agence France-Presse, August 10, 2017
https://www.theguardian.com/science/2017/aug/11/close-encounter-asteroid-2012-tc4-size-of-a-house-near-miss-with-earth

Another news article is:

Could asteroids bombard the Earth to cause a mass
extinction in ten million years? Asteroids have hit
Earth throughout its history, but there’s no way to
know when the next big one is likely. Sanna Alwmark,
Lund University, Cosmos, August 14, 2017
https://cosmosmagazine.com/space/could-asteroids-bombard-the-earth-to-cause-a-mass-extinction-in-ten-million-years

The paper is:

Matthias M. M. Meier  and Sanna Holm-Alwmark,
2017, A tale of clusters: no resolvable periodicity in
the terrestrial impact cratering record. Monthly Notices
of the Royal Astronomical Society, Volume 467,
Issue 3, 1 June 2017, Pages 2545–2551,
https://doi.org/10.1093/mnras/stx211
https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx211

Yours,

Paul H.