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Forum » SpaceEngine » Science and Astronomy Discussions » Comets thread (Anything and everything to do with comets)
Comets thread
midtskogenDate: Sunday, 01.12.2013, 10:36 | Message # 211
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Tomorrow ISON will rise when the sun is 12 degrees below the horizon, but it's expected to be visible around 8-9 mag, so it's going to be hard to spot.




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borek555Date: Sunday, 01.12.2013, 13:05 | Message # 212
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Voekoevaka, I had a similar idea biggrin

Edited by borek555 - Sunday, 01.12.2013, 13:06
 
midtskogenDate: Monday, 02.12.2013, 12:59 | Message # 213
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COR2 Ahead animation:





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FrostbreathDate: Tuesday, 03.12.2013, 13:41 | Message # 214
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ISON is now confirmed to be dead by NASA, or so I heard. I made this little video about its life:
https://www.youtube.com/watch?v=Lcah0gtqRaI





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SolarisDate: Saturday, 14.12.2013, 02:46 | Message # 215
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Comet ISON from ISS, November 23 2013 :
 
SolarisDate: Saturday, 08.03.2014, 20:32 | Message # 216
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Comet Lovejoy the 13/12/2013 :

From Gerald Rhemann
 
WatsisnameDate: Monday, 10.03.2014, 02:55 | Message # 217
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Breathtaking image; love the ion tail structure. cool




 
SolarLinerDate: Wednesday, 06.08.2014, 18:21 | Message # 218
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Rosetta successfully rendezvous'd with 67P/Churyumov–Gerasimenko!






Click on images to see full res





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Antza2Date: Thursday, 07.08.2014, 22:41 | Message # 219
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Wow! I didn't expect the geology to look anything like that. smile




Go to antza2.deviantart.com for cool photos!
 
Tank7Date: Friday, 08.08.2014, 07:26 | Message # 220
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I like the crazy shape of Chup./Gerasimenko. It would be fun to control a rover on that, preferrably one that can flip like those Sidewinder remote control cars that were cool in the... 90s?
 
midtskogenDate: Friday, 08.08.2014, 07:35 | Message # 221
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Of the 6 comets now visited by space probes, most of them are peanut shaped, suggesting that big comets usually get this shape, which is interesting.




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HarbingerDawnDate: Friday, 08.08.2014, 08:53 | Message # 222
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Quote Tank7 ()
It would be fun to control a rover on that

It doesn't have enough gravity for a rover to work.





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SHWDate: Friday, 08.08.2014, 16:21 | Message # 223
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Quote HarbingerDawn ()
It doesn't have enough gravity for a rover to work.

It is possible to use propulsion engine, pointed to space, to simulate gravity.
But in practice it is useless.





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Tank7Date: Saturday, 09.08.2014, 07:02 | Message # 224
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Wikipedia gives escape velocity as 0.46 m/s. This is 1656 meters per hour (1.656 Km / h)
While this is extremely low, couldn't a rover slowly rove below those speeds safely? On Wikipedia for the Curiosity rover, top speed is 90 meters per hour (0.09 Km / h) while average speed is 30 meters per hour (0.03 Km / h)

I could see the wheels just spinning with insufficient traction perhaps. They might need some cleats or spikes, or maybe a comet-rover could use something that resembles tank tracks for improved traction.

Again I imagine this more for fun than science. What I am imagining though is like... Go off a bump and you get a nice sub-orbital flight for the camera to record. That's kinda what I meant by "fun".

It would be fun to land a manned mission (think KSP EVA) and get out in a space suit on one of these... see if you can "jump" off the ground in such a way that you do exactly 1 orbit and land back where you were biggrin Would need jetpack in case you screw up ofcourse. Effortless orbits, gliding over the surface at 1 Km / hour, taking some... 5 or 6 hours to orbit. And virtually no risk of damage from colliding with higher ground or other objects at that speed!
 
midtskogenDate: Saturday, 09.08.2014, 08:30 | Message # 225
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Quote Tank7 ()
Wikipedia gives escape velocity as 0.46 m/s. This is 1656 meters per hour (1.656 Km / h)
While this is extremely low, couldn't a rover slowly rove below those speeds safely?

No, it's not that simple. By that logic, you could say that we can operate a rover safely on Earth as long as its speed is below 11 km/s.

A rover on a comet just wouldn't be anywhere near practical.





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