Despite being large (390 ft, or ~130 meters for us using the metric system), its composition (mostly solid ice) makes it so that in the case of the wrong trajectory and an impact on Earth, most of it is supposed to evaporate and burn; it would quickly be fragmented in thousands of pieces, and have huge impacts in a small area, and almost no impact to the Earth's ecosystem. This is AFAIK, and I am not an astronomer or an expert. Please correct me if I am wrong. Unfortunately there's no Palermo Hazard scale for this particular asteroid [0].
There's some very relevant Wikipedia pages about the subject [1], [2].
People would definitely notice. A 390 foot meteor bursting into many smaller meteors is still going to be a spectacular show (and likely cause some damage.)
It's just not going to be an extinction level event.
Vulcanism has a ... generally ... bounded upper scale,[1] astronomical impactors do not, and demonstrably modest impactors have had devastating results, with numerous candidates existing. Fortunately they're sparsely distributed.
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Notes:
1. Volcanic traps caused by flood basalt eruptions being an extreme outlier upper bound, see the Siberian Traps, 500 million ya, as a notable example.
There have been 18 identified, most 100s of millions to billions of years ago, though as recently as 10 mya. Yellowstone is among the younger (17 mya). The events may be associated with meteor impacts as well -- evidence is poorly preserved.
Thanks for that, very interesting. Couldn't quite figure out whether I'd be able to see/photograph it from Australia during the night but then again I'm pretty clueless.
There's some very relevant Wikipedia pages about the subject [1], [2].
[0]: https://en.wikipedia.org/wiki/Palermo_Technical_Impact_Hazar...
[1]: https://en.wikipedia.org/wiki/Impact_event#Geological_signif...
[2]: https://en.wikipedia.org/wiki/Asteroid_impact_avoidance
It's just not going to be an extinction level event.
Is this rare or pretty common?
Along with a more level-headed collection of facts about the asteroid, which is not classified as Potentially Hazardous: https://www.spacereference.org/asteroid/2019-od
In the past 1500 years, at least three eruptions have caused global crop failures: Tambora, Samalas, Ilopango.
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Notes:
1. Volcanic traps caused by flood basalt eruptions being an extreme outlier upper bound, see the Siberian Traps, 500 million ya, as a notable example.
https://en.wikipedia.org/wiki/Siberian_Traps
There have been 18 identified, most 100s of millions to billions of years ago, though as recently as 10 mya. Yellowstone is among the younger (17 mya). The events may be associated with meteor impacts as well -- evidence is poorly preserved.
https://en.wikipedia.org/wiki/Flood_basalt