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Asteroid ZTm0038 with a >3% impact probability

newton.spacedys.com

41–50 of 252 posts

Re: Asteroid ZTm0038 with a >3% impact probability

#41

How long ago was it spotted. That's what I'm curious about, did we have any lead time?

According to https://www.projectpluto.com/neocp2/mpecs/ZTm0038.htm#elemen... the observations were taken a few days ago, August 12-13. I don't know when someone calculated the future trajectory and impact probability though.

Re: Asteroid ZTm0038 with a >3% impact probability

#42

I'm aware that it already passed its closest approach, but what does >3% even mean? 100% is >3%, but 3.000001% is >3% too. Was an impact certain at some point and the probability degraded to a bit above 3% over the course of the asteroid's trajectory? If so, I think I'd like to have a heads up when the probability is still closer to 100%, before it drops?

[deleted]

Re: Asteroid ZTm0038 with a >3% impact probability

#43

I'm aware that it already passed its closest approach, but what does >3% even mean? 100% is >3%, but 3.000001% is >3% too. Was an impact certain at some point and the probability degraded to a bit above 3% over the course of the asteroid's trajectory? If so, I think I'd like to have a heads up when the probability is still closer to 100%, before it drops?

Think of it as the most sensational number you can write without lying. So it's between 3% and 4%.

Re: Asteroid ZTm0038 with a >3% impact probability

#46
post #35

Looks pretty bad in this asteroid impact simulator: https://neal.fun/asteroid-launcher/

How accurate is this? I just feel implicitly that a 1mi asteroid would leave a creater bigger than 30mi wide upon direct max impact ;)

I also wouldn't expect an impact in rural Kansas to create a 2,500 foot tall tsunami.

Re: Asteroid ZTm0038 with a >3% impact probability

#48
post #35

Looks pretty bad in this asteroid impact simulator: https://neal.fun/asteroid-launcher/

How accurate is this? I just feel implicitly that a 1mi asteroid would leave a creater bigger than 30mi wide upon direct max impact ;)

If you scroll you'll see that the fireball is much larger than the crater.

Re: Asteroid ZTm0038 with a >3% impact probability

#49
Is there an english / eli5 if you like, summary of what this means?

I gather that today or yesterday an asteroid ~400m along it's biggest dimension ultimately came within x km of earth, that was close enough there was a nontrivial chance it would hit us? And this is big enough to make a 30 mile crater? And we only found out it was coming a couple days ago? Sounds like a pretty big deal if that's accurate.

Re: Asteroid ZTm0038 with a >3% impact probability

#50
post #9

Impact time is in the past. Mission accomplished, everyone!

Am I reading this data correctly?:

https://cneos.jpl.nasa.gov/scout/#/object/ZTm0038

Because it looks like today is the most probable day of impact at 10%, but there is a good 25%+ chance it will impact sometime in the next two weeks.

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