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Asteroids, meteors, and meteorites
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| Watsisname | Date: Wednesday, 19.11.2014, 19:02 | Message # 181 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Once during a winter storm with low cloud cover I saw a similar effect from a burning transformer substation about a half mile away. It produced, for about half a minute, a huge amount of light... at first blue from the electric discharges, but then an angry fiery red which illuminated the whole sky.
This may or may not have a similar cause, but whatever it is, the latter vids do seem to strongly indicate that the illumination source is at ground level and being reflected off the cloud deck from below.
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| midtskogen | Date: Wednesday, 03.12.2014, 20:36 | Message # 182 |
 Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| The national meteor camera network in Norway will become a reality. We applied for funds to purchase cameras, accessories and to hire someone to do the work we don't have time for in our spare time, 1,000,000 kroner (US$140,000), and we got the reply today - we got 1,000,000 kroner!!
This is really cool. Our plan is to finish the technical solutions (we're getting close), buy cameras and deploy them in schools nationwide. My prototype camera system is working well, and we should be operational nationwide in time for the dark season next year.
NIL DIFFICILE VOLENTI
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| SpaceEngineer | Date: Friday, 06.02.2015, 09:31 | Message # 183 |
 Author of Space Engine
Group: Administrators
Russian Federation
Messages: 4800
Status: Offline
| Dawn approaches Ceres, new images:
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| midtskogen | Date: Tuesday, 28.04.2015, 06:55 | Message # 184 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| The Annama meteorites are now official: http://www.lpi.usra.edu/meteor/metbull.php?code=61696
I was involved in locating the fall site. 
Added: A recently publish paper on the fall.
Added (28.04.2015, 06:55)
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I'm very happy with this shot taken last night from a site 30 km north of Oslo:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Tuesday, 28.04.2015, 12:57 |
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| midtskogen | Date: Thursday, 13.08.2015, 09:39 | Message # 185 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| A very nice 9 second fireball last night near the Norwegian/Swedish border:
Not a perseid. Video:http://norskmeteornettverk.no/meteor....nic.mp4
It faded 30 km up in the atmosphere. About -14 magnitude.
NIL DIFFICILE VOLENTI
Edited by midtskogen - Thursday, 13.08.2015, 09:41 |
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| Fireinthehole | Date: Thursday, 13.08.2015, 12:19 | Message # 186 |
 Pioneer
Group: Translators
Sweden
Messages: 356
Status: Offline
| midtskogen, where along the border and what time? I live about 90 km from the border but didn't see anything.
Love SpaceEngine!
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| midtskogen | Date: Thursday, 13.08.2015, 15:50 | Message # 187 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| See http://norskmeteornettverk.no/wordpress/?p=2112 for preliminary analysis.
Also check this video:
NIL DIFFICILE VOLENTI
Edited by midtskogen - Thursday, 13.08.2015, 15:51 |
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| jjliang | Date: Friday, 16.10.2015, 00:25 | Message # 189 |
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Space Tourist
Group: Users
United States
Messages: 20
Status: Offline
| 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?
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| midtskogen | Date: Sunday, 25.10.2015, 20:21 | Message # 190 |
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Star Engineer
Group: Users
Norway
Messages: 1674
Status: Offline
| Meteorite dropping bolide south of Stockholm.
NIL DIFFICILE VOLENTI
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| Watsisname | Date: Sunday, 25.10.2015, 22:44 | Message # 191 |
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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 # 192 |
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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 # 193 |
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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 # 194 |
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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 # 195 |
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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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