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Comets thread
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| midtskogen | Date: Sunday, 01.12.2013, 10:36 | Message # 211 |
 Star Engineer
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Norway
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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.
NIL DIFFICILE VOLENTI
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| borek555 | Date: Sunday, 01.12.2013, 13:05 | Message # 212 |
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Space Tourist
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Poland
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| Voekoevaka, I had a similar idea 
Edited by borek555 - Sunday, 01.12.2013, 13:06 |
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| midtskogen | Date: Monday, 02.12.2013, 12:59 | Message # 213 |
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Star Engineer
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Norway
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| COR2 Ahead animation:
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| Frostbreath | Date: Tuesday, 03.12.2013, 13:41 | Message # 214 |
 Space Pilot
Group: Translators
Netherlands
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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
Amateur astronomer. Owner of a Celestron C8 telescope and, of course, Space Engine. Translator for Dutch.
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| Solaris | Date: Saturday, 14.12.2013, 02:46 | Message # 215 |
 World Builder
Group: Global Moderators
France
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| Comet ISON from ISS, November 23 2013 :
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| Solaris | Date: Saturday, 08.03.2014, 20:32 | Message # 216 |
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World Builder
Group: Global Moderators
France
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Status: Offline
| Comet Lovejoy the 13/12/2013 :
From Gerald Rhemann
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| Watsisname | Date: Monday, 10.03.2014, 02:55 | Message # 217 |
 Galaxy Architect
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United States
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| Breathtaking image; love the ion tail structure. 
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| SolarLiner | Date: Wednesday, 06.08.2014, 18:21 | Message # 218 |
 Explorer
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France
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| Rosetta successfully rendezvous'd with 67P/Churyumov–Gerasimenko!
Click on images to see full res
custom landing page to share: http://bit.ly/spaceengine
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| Antza2 | Date: Thursday, 07.08.2014, 22:41 | Message # 219 |
 World Builder
Group: Global Moderators
Finland
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| Wow! I didn't expect the geology to look anything like that. 
Go to antza2.deviantart.com for cool photos!
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| Tank7 | Date: Friday, 08.08.2014, 07:26 | Message # 220 |
 Space Tourist
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Canada
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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?
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| midtskogen | Date: Friday, 08.08.2014, 07:35 | Message # 221 |
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Star Engineer
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Norway
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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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| HarbingerDawn | Date: Friday, 08.08.2014, 08:53 | Message # 222 |
 Cosmic Curator
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United States
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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.
All forum users, please read this!
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| SHW | Date: Friday, 08.08.2014, 16:21 | Message # 223 |
 Astronaut
Group: SE team
Pirate
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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.
Your mind is software. Program it.
Your body is a shell. Change it.
Death is a disease. Cure it.
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| Tank7 | Date: Saturday, 09.08.2014, 07:02 | Message # 224 |
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Space Tourist
Group: Users
Canada
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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 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!
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| midtskogen | Date: Saturday, 09.08.2014, 08:30 | Message # 225 |
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Star Engineer
Group: Users
Norway
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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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