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Asteroids, meteors, and meteorites
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| Watsisname | Date: Sunday, 25.10.2015, 22:44 | Message # 196 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Wow, I never realized just how extreme the accelerations of bolides in the atmosphere can be. Thousands of g's!
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| midtskogen | Date: Monday, 26.10.2015, 06:06 | Message # 197 |
 Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| Don't take the accelleration graph especially towards the end too seriously. It's based on simple curve fitting of the observed trajectories in the videos and not on a proper atmospheric model. We run more realistic simulations including dark path simulations, but these require much manual guidance. There are a lot of unknowns, like density, mass and drag. In this case the exact entry speed is a bit unclear. Most cameras were far away (500 km) and those nearby were overexposed.
The exploding nature of the bolide is better seen in this video from Uppsala. The bright spot near the bolide is the Moon (-12.5, which also gives an idea of the brightness of the meteor).
The entry mass was likely around 100 kg.
NIL DIFFICILE VOLENTI
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| JohnVV | Date: Saturday, 31.10.2015, 06:29 | Message # 198 |
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Space Tourist
Group: Users
United States
Messages: 36
Status: Offline
| Quote
Ceres needs to have a makeover in future versions of Space Engine. How about using John Van Vliet's texture of that dwarf planet using data from Dawn?
mine is only the early OpenNAV5 image that was released ( with the poles fixed )
the rc3 data is NOW in PDS
as to a "shape file" for a 3d mesh
the 32 bit .cub on my gdrive ( links on many sites ) is currently the only height map in the public , but it is extracted from "ceres_opnav5_512.txt" ( a port of the ceres_opnav5_512.bds )
and VERY soon to be out of date
Edited by JohnVV - Saturday, 07.11.2015, 07:42 |
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| midtskogen | Date: Sunday, 22.11.2015, 19:47 | Message # 199 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| Daytime bolide in Norway. This is the first we've photographed in full sunshine. Unfortunately, only the closest camera was able to record it in the glare of the sun.
NIL DIFFICILE VOLENTI
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| midtskogen | Date: Sunday, 13.12.2015, 16:01 | Message # 200 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| It's time for the Geminids again.
The weather gas been mixed here, but I got one on video a couple of days ago: http://norskmeteornettverk.no/meteor/20151212/033227/
NIL DIFFICILE VOLENTI
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| midtskogen | Date: Sunday, 24.04.2016, 16:46 | Message # 201 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| The Lyrids have just peaked. These are fast meteors (~48 km/s) but sometimes they produce bright fireballs leaving a glowing trail lasting several seconds.
Here's a couple from the past two nights:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Sunday, 24.04.2016, 16:47 |
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| midtskogen | Date: Sunday, 15.05.2016, 09:26 | Message # 202 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| The nights are no longer completely dark anywhere in Norway, but we still record some meteors against the bright sky. Here's what we've got so far in May:
NIL DIFFICILE VOLENTI
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| butterarmyxjrblx | Date: Sunday, 26.06.2016, 00:06 | Message # 203 |
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Astronaut
Group: Users
Pirate
Messages: 71
Status: Offline
| Apparently, for the moment, we have 2 moons. One as our main moon, the other is 2016 H 03. Here's a picture of the surface:
I also added it in in SE:
this moon will eventually escape though.
"You can't spell Challenge without change. You need to change to overcome challenges." -Bo Dallas
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| midtskogen | Date: Thursday, 30.06.2016, 16:00 | Message # 204 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| Our network is featured on EPOD today. 
NIL DIFFICILE VOLENTI
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| spacer | Date: Thursday, 11.08.2016, 20:43 | Message # 205 |
 Star Engineer
Group: Users
Israel
Messages: 1258
Status: Offline
| so disappointing. so many clouds right now...its 23:42 now. there is all night ahead. but meanwhile there seems to be no ending clouds  the last 3 years was like that. i guess i will never see persaids 
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
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| midtskogen | Date: Thursday, 11.08.2016, 22:25 | Message # 206 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| I just spent 20 minutes watching. Not a lot of activity, but I saw at least this one:
NIL DIFFICILE VOLENTI
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| spacer | Date: Thursday, 11.08.2016, 22:45 | Message # 207 |
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Star Engineer
Group: Users
Israel
Messages: 1258
Status: Offline
| midtskogen, ohh wow! nice picture! so i succeed to watch 2 in 40 minutes!
and its impressive for light polluted town like mine. also dust from the desert.
in norway i guess its much more clear and beautiful.
the problem right now is that clouds coming and going away so you cant watch it in row
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
Edited by spacer - Thursday, 11.08.2016, 22:45 |
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| Watsisname | Date: Thursday, 11.08.2016, 23:15 | Message # 208 |
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Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Nice capture, midtskogen!
The shower's expected to peak tonight at 13:00-15:30 UTC. That's a bit after sunrise for me, but close enough. I'll plan to watch it. 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?
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| steeljaw354 | Date: Thursday, 11.08.2016, 23:22 | Message # 209 |
 World Builder
Group: Users
Pirate
Messages: 862
Status: Offline
| What happens when a 1km wide pure ice comet hits the earth in the Saharan desert?
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| spacer | Date: Thursday, 11.08.2016, 23:31 | Message # 210 |
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Star Engineer
Group: Users
Israel
Messages: 1258
Status: Offline
| steeljaw354, well when it enter the atmosphere some of it will melt. but we talking about 1 kilometer so some if not most of it will survive. but the impact itself will be super hot, so if your question is if the desert will be covered in ice, the answer is no.
wats, go to the mountains!! it may not be clear but its gonna be worth it!!
now when i live its cloudy, imagine cloudy+pollution and i still got to see 2 of them allready!!
take the risk and go to the mountains! ^_^
edit: just saw 5 more in 20 minutes!! and there is tomorrow night too!!
gonna be awesome if sky will be clear
"we began as wanderers, and we are wanderers still"
-carl sagan
-space engine photographer
Edited by spacer - Thursday, 11.08.2016, 23:55 |
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