Is there a KSP-OPM planet orbit simulator?

[LtChambers]

I'd like to be able to fast-forward/rewind time and see where the planets are for lining up a multi-outer-planet non-flyby probe mission, preferably returning to Kerbin at the end. I guess this is sort of Voyager 2 style but I plan to carry enough delta V to go into elliptical orbit around each planet instead of just flying by (trying to align the ellipse to make the most of the Oberth effect when jumping to the next planet). I could do this with an empty sandbox save but wouldn't be able to rewind if I went forward too far. I've seen the universe sandbox threads but those say it's an unstable system (although I'm not sure if that's only for the moons or also for the planets).

[swjr-swis]

3 hours ago, LtChambers said:

I could do this with an empty sandbox save but wouldn't be able to rewind if I went forward too far.

No real rewind, but you can still do this two ways: by saving a game state at a certain date and time you wish to be able to go back to, and reverting to it or loading it. Or by editing the persistent.sfs in the save to fill in an arbitrary time (it's a text file). The value you're looking for is 'UT = xxx.xxxxxxxxxxxxxx' with xxx.xxxxxxxxxxxxxx being a floating point value between 0 and 19760285526235197 (at this point, less than a second to in-game year 2147483647, the game starts going crazy).

[LtChambers]

1 hour ago, swjr-swis said:

No real rewind, but you can still do this two ways: by saving a game state at a certain date and time you wish to be able to go back to, and reverting to it or loading it. Or by editing the persistent.sfs in the save to fill in an arbitrary time (it's a text file). The value you're looking for is 'UT = xxx.xxxxxxxxxxxxxx' with xxx.xxxxxxxxxxxxxx being a floating point value between 0 and 19760285526235197 (at this point, less than a second to in-game year 2147483647, the game starts going crazy).

Thanks. For seeing the system at many time points that would have been way too tedious so I just modded hyperedit instead: https://github.com/Ezriilc/HyperEdit/pull/67 

Turns out that Plock gets really close to Neidon in the year 23251. Lining all the planets up only happens on the order of thousands of years. They start out with a really good alignment actually and it takes over a hundred years to get back to something resembling that, excluding Plock.

[Gargamel]

Moved to Add-on Discussion. 

[Poodmund]

@LtChambers, it sounds as though you want this mod:

 

[BadModder54]

Would this work for RSS/Principia?

[LtChambers]

On 10/5/2019 at 1:04 AM, BadModder54 said:

Would this work for RSS/Principia?

Which one? The HyperEdit mod I did? I expect certainly for RSS, perhaps not for Principia.