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Asteroids, meteors, and meteorites
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| steeljaw354 | Date: Thursday, 11.08.2016, 23:57 | Message # 211 |
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| How would it impact humanity? Will humanity survive?
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| Watsisname | Date: Friday, 12.08.2016, 01:47 | Message # 212 |
 Galaxy Architect
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| Quote steeljaw354 (  ) What happens when a 1km wide pure ice comet hits the earth in the Saharan desert?
http://impact.ese.ic.ac.uk/ImpactEffects/
It would be a pretty big event -- about one in a million years. Radiation from the fireball would be lethal to a couple hundred km. Seismic shaking and ejecta reach even farther. The sound of the blast would be heard across Europe.
Quote steeljaw354 ( ) How would it impact humanity? Will humanity survive?
Absolutely. There'd be some short term climatic effects, but nothing too serious. This isn't even approaching the scale of the dinosuar-killer. A plus is that if it hits the Sahara, there's not much nearby vegetation to spread fire and smoke.
There would probably be a lot of desert glass.
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| steeljaw354 | Date: Friday, 12.08.2016, 02:02 | Message # 213 |
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| Didn't expect that from a big ice cube, was expecting it to melt or vaporize, I was thinking something 100% pure water ice would just appear out of no where and fall to earth.
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| Watsisname | Date: Friday, 12.08.2016, 02:12 | Message # 214 |
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Galaxy Architect
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| Lol, not a chance.  Think of the kinetic energy of that much mass moving that quickly -- over a hundred thousand megatons of TNT! And it reaches the ground just seconds after hitting the top of atmosphere.
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| DoctorOfSpace | Date: Friday, 12.08.2016, 05:02 | Message # 215 |
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| A friend and I drove around for a couple hours and saw quite a few streaks in the sky. Didn't take any pictures or anything though, sadly night got cut short when the clouds rolled in. 
Intel Core i7-5820K 4.2GHz 6-Core Processor
G.Skill Ripjaws V Series 32GB (4 x 8GB) DDR4-2400 Memory
EVGA GTX 980 Ti SC 6GB
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| midtskogen | Date: Friday, 12.08.2016, 05:51 | Message # 216 |
 Star Engineer
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Norway
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| Quote spacer ( ) in norway i guess its much more clear and beautiful.
Actually, the Perseids, though one of the showers that never fail, have limited visibility from Norway. Even in southern Norway we only have 3 hours of reasonable darkness in mid August. The picture above was taken 23:36 local time and the sky wasn't yet properly dark.
Quote Watsisname ( ) Now the question is... do I watch from my home where there's more light pollution, but clear skies forecast, or go to the mountains where it's dark, but partly cloudy forecast?
I would go for the clear forecast, unless the light pollution is like central Tokyo.
The Perseids have been active for several weeks, so I don't think it's critical to watch during the estimated peak hour. But there definitely was more activity last night than the night before.
Quote steeljaw354 ( ) What happens when a 1km wide pure ice comet hits the earth in the Saharan desert?
It will hit the ground with nearly the same speed and mass as it had before atmospheric entry., and the local effect will be equally catastrophic whether it's Sahara or Antarctica (the crater will be different, though). It will not have time to slow down. There will be no global effects to worry about, and the radius of the catastrophic local effects will depend a lot of the impact speed.
Another one from last night, which I didn't see myself, though:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Friday, 12.08.2016, 05:53 |
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| midtskogen | Date: Friday, 12.08.2016, 11:22 | Message # 217 |
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Star Engineer
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Norway
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| A one hour composite:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Friday, 12.08.2016, 11:23 |
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| steeljaw354 | Date: Friday, 12.08.2016, 14:09 | Message # 218 |
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| So I heard that in the 1960's there was a small asteroid which dived into Earth's atmosphere and came out, how big was it?
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| spacer | Date: Friday, 12.08.2016, 14:25 | Message # 219 |
 Star Engineer
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Israel
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| steeljaw354, just a few meters
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
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| Watsisname | Date: Friday, 12.08.2016, 17:22 | Message # 220 |
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Galaxy Architect
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| Quote spacer ( ) wats, go to the mountains!! it may not be clear but its gonna be worth it!!
Soo... I was actually pretty much decided on staying home for the clear forecast, and the general convenience of not having to drive. But I saw your post and went for it.
spacer...
you're the greatest.  It was perfect up there, and I had the best night under the stars ever. Photos to come!
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| spacer | Date: Friday, 12.08.2016, 17:28 | Message # 221 |
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Star Engineer
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Israel
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| Watsisname, yoohoo!! awesome!! dont forget there is still 1 more night to watch a peak!!
in few hours if i have luck i will go outside to my balcony to lay down and maybe watch some more.
at your place i guess you have to wait 14 more hours so the peak will be less for you but still will be great even if you stay to watch it from home!!
cant wait to watch your images!
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
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| midtskogen | Date: Friday, 12.08.2016, 19:28 | Message # 222 |
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Norway
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| Quote Watsisname ( ) It was perfect up there, and I had the best night under the stars ever.
A good thing that you didn't follow my advice on the safest bet on clear skies, then. :)
I made a video of the brightest Perseids of last night.
The hourly rate was about 40-50 from my [light polluted] location, but I might have missed the anticipated peak.
Quote spacer ( ) dont forget there is still 1 more night to watch a peak!!
I think tonight would be better here, but I consider myself lucky to have got last night after 188 mm rain in 7 days, clearing briefly yesterday, going back to rain today. The rain has stopped now, but the fog remains, so I can't see whether there is clear sky ahead, and it's dark in two hours [followed by three hours of useful darkness].
NIL DIFFICILE VOLENTI
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| spacer | Date: Friday, 12.08.2016, 20:03 | Message # 223 |
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Star Engineer
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Israel
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| yeah i saw that some articles say that saturday night will be better so lets hope!
yesterday i saw 8 meteors in 2 hours. 4 per hour...pretty low but good for polluted place with naked eye
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
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| steeljaw354 | Date: Friday, 12.08.2016, 20:06 | Message # 224 |
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| What is the asteroid that has the most moons? What would a terraformed asteroid look like?
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| midtskogen | Date: Friday, 12.08.2016, 20:21 | Message # 225 |
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Star Engineer
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Norway
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| Quote spacer ( ) yesterday i saw 8 meteors in 2 hours. 4 per hour...pretty low but good for polluted place with naked eye
I think you were unlucky. Many more were visible over Oslo yesterday, which is also light polluted. But even if the rate is 50 per hour, you wont see that many, not just because of light pollution, but because you're not able to watch the entire sky all the time. Most will be missed, and a lot will only be seen from the corner of your eye. Perseids are very fast and few last more than a second.
The activity is really gaining momentum now.
NIL DIFFICILE VOLENTI
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