KSP Glitch

[CharlesLEC]

Idk if I fudged up or something but whenever I get an eve encounter, I get captured back into kerbin orbit, I did not flyby any moons and i’ve tried multiple times

Edited January 31, 2023 by CharlesLEC

[James Kerman]

Welcome to the forum @CharlesLEC, your issue has been moved from KSP Discussion to Gameplay Questions.

Just for a bit more clarity, are you entering Eve's sphere of influence at any point?

[CharlesLEC]

How [snip] am I supposed to enter eve soi if I cant even leave the kerbin soi? Use some common sense

25 minutes ago, James Kerman said:

Welcome to the forum @CharlesLEC, your issue has been moved from KSP Discussion to Gameplay Questions.

Just for a bit more clarity, are you entering Eve's sphere of influence at any point?

 

Edited January 31, 2023 by Vanamonde
Mind the language, please.

[Vanamonde]

We can't help if we're not clear about the problem. 

At a guess, I'd say you're leaving Kerbin at the wrong angle and the planet is catching up with you. Can you share a screenshot of your trajectory as you attempt to depart Kerbin? 

[CharlesLEC]

You move faster than the planet once escape velocity is reached so the planet can't be moving faster than you

Edited February 1, 2023 by CharlesLEC

[CharlesLEC]

On 1/31/2023 at 5:36 PM, Vanamonde said:

We can't help if we're not clear about the problem. 

At a guess, I'd say you're leaving Kerbin at the wrong angle and the planet is catching up with you. Can you share a screenshot of your trajectory as you attempt to depart Kerbin? 

You will always leave the SOI if escape velocity is reached unless you flyby a moon

[jimmymcgoochie]

On 2/1/2023 at 7:04 AM, CharlesLEC said:

You move faster than the planet once escape velocity is reached so the planet can't be moving faster than you

That’s not how orbital mechanics works, at all. In fact to travel to Eve you have to move slower than Kerbin to drop your perihelion down towards Eve’s orbit.

Take a screenshot once the transfer burn is complete and another when this glitch occurs, upload them to a file sharing site (e.g. imgur) and post them here using the “insert image from URL” button in the bottom right of the text box.

[CharlesLEC]

I'm pretty sure once you reach escape velocity, you will escape the SOI. You cant be captured again, and if this was possible then Pioneer 10 or 11 (one of the 2) would be in the suns orbit, but we all know P10 and 11 will escape the sun's soi

 

 

 

 

 

 

[jimmymcgoochie]

4 hours ago, CharlesLEC said:

I'm pretty sure once you reach escape velocity, you will escape the SOI. You cant be captured again

Yes you can- you’re fundamentally not understanding how orbital mechanics work. In space, EVERYTHING is moving and when you leave the gravity of one body you’re in orbit of its parent body e.g. Kerbin > sun (Kerbol) or Earth > Sun (Sol).

Even in the simplified single body patched conics system used by KSP, where you’re only affected by the gravity of one body at a time, it’s pretty easy to eject from e.g. Kerbin’s SOI into an orbit that will bring you right back to Kerbin after a while.

Many real missions (especially going to Mercury or even closer to the sun) use repeated flybys of Earth and/or Venus for gravity assists to reduce the delta-V and therefore fuel required, with BepiColombo doing six flybys of Mercury to gradually match orbits before capturing.

Now, how about those screenshots?

[Kerbart]

5 hours ago, CharlesLEC said:

I'm pretty sure once you reach escape velocity, you will escape the SOI.

True. I'm sure there are soome caveats, but yes...

5 hours ago, CharlesLEC said:

You cant be captured again

Leaving one SOI simply means entering another SOI, usually of the parent body. Consider setting up a return trajectory from the Mun to Kerbin. It's really not that hard to come up with one where eventually you'll be recaptured by the Mun. Extending that to Kerbin/Kerbol is just a matter of scale.

You leave Kerbin SOI. Now you're orbiting the sun. Kerbin is orbiting the sun. At least part of your orbits is shared; there's a good chance that en encounter might happen.

5 hours ago, CharlesLEC said:

, and if this was possible then Pioneer 10 or 11 (one of the 2) would be in the suns orbit, but we all know P10 and 11 will escape the sun's soi

They had encounters with other planets, altering their course and velocity

 

On 2/1/2023 at 2:04 AM, CharlesLEC said:

You move faster than the planet once escape velocity is reached so the planet can't be moving faster than you

Orbits are cyclical, not linear. What's behind you now will eventually be in front of you. Just because something foes faster doesn't automatically mean you won't see it ever again.

[Scarecrow71]

On 1/31/2023 at 11:11 PM, CharlesLEC said:

You will always leave the SOI if escape velocity is reached unless you flyby a moon

This isn't accurate in the least.  You can actually achieve escape velocity by using a slingshot (gravity assist) with a lunar flyby.  In KSP, you can get ejected from Duna's SOI simply by passing by Ike whether you want to be ejected or not.  Same goes for Tylo.

To put my own 2 cents in this:  Picture Kerbin as it orbits the sun in a circle.  Eve is orbiting the sun in the same direction, but closer to the sun.  The circles are concentric, meaning one inside the other.  Now put your spacecraft in orbit of the sun, heading from Kerbin to Eve.  This isn't concentric to the other two, but rather intersecting both.  At some point, your craft will intersect Eve's orbit.  And unless you get captured in orbit of Eve, you will continue back towards and intersect with Kerbin's orbit.  And after enough time and passes elapse, without any other interference, you very well can and will end up in Kerbin's SOI.  How?  Because Kerbin continues to move on its orbit while you are moving on yours.

I hope that helps explain it.  As others have said, if you can provide a acreenshot or two, we can provide some more in-depth analysis to help figure out what is happening and how to get you safely to Eve.

Edited February 3, 2023 by Scarecrow71

[king of nowhere]

On 2/3/2023 at 2:03 AM, CharlesLEC said:

I'm pretty sure once you reach escape velocity, you will escape the SOI. You cant be captured again, and if this was possible then Pioneer 10 or 11 (one of the 2) would be in the suns orbit, but we all know P10 and 11 will escape the sun's soi

wrong.

you can very well escape kerbin and get ejected into an orbit that crosses kerbin again; it all depends on the direction you get ejected. oh, you won't get captured; you'll make a flyby of kerbin and be ejected again - unless you crash on the planet. still, the change of influence can be jarring.

[snip]

Anyway, probably solution. I surmise that you are trying to escape kerbin's SoI first, get into solar orbit, then get an intercept for Eve. And it's failing because you keep getting captured back by Kerbin. Putting aside that this is a terrible way to make interplanetary transfer, as you lose all Oberth effect AND all the excess speed you had exiting kerbin, you can eject from kebin in a trajectory that will get you captured again. Specifically, you are ejecting either forward and upward, or backwards and downwards. In the first case, now that your orbit is higher than kerbin you slow down compared to it, and kerbin catches up to you. In the second, now that your orbit is lower than kerbin, you will catch kerbin. This kind of stuff happens in real life too, look for quasi-satellite or horseshoe orbit. In any case, if you don't want to fall back towards kerbin, you have to either learn proper interplanetary transfers, or eject with a different angle, or eject with some more speed - because really, this is only happening because your speed relative to kerbin is very low, as you're ejecting with the least possible speed to save fuel.

I hope I correctly guessed what you were doing.

Edited February 5, 2023 by Snark
Redacted by moderator

[Scarecrow71]

@CharlesLEC

So...did you solve the issue?

If not, can you provide a screenshot or two showing the craft and the orbit you are trying to achieve and what happens?  I'm trying to wrap my head around what is going on here, but without more info I'm not sure I or anyone else here on the forum can answer or point you in the right direction.

[Gargamel]

Some content has been removed.     On these forums we do not attack the person, only their arguments.