are "unknown objects" the same in every game?

[Brainlord Mesomorph]

Normally I play career mode, but I launched sandbox mode to test something, and as I’m time warping to get to a particular launch window, I noticed one of those NKOs swing ridiculously close to Kerbin. I noted the date.

My question is, now that the date is approaching in my career game, is that same NKO going to do the same thing again?

Or are those unknown objects random from game to game?

(obviously planets aren't random or those online launch window calculators wouldn't work)

[Pecan]

Asteroids are random but, in any case, do not 'exist' unless you track them in the TC.

[Brainlord Mesomorph]

Asteroids are random but, in any case, do not 'exist' unless you track them in the TC.

Oh, That's why they keep disappearing on me.

[deepspacecreeper]

I notice that every new save game has the asteroid "HSJ-227", but i am not sure if the trajectory will always be the same.