# Problem with Jupiter's Atmosphere

## Recommended Posts

Hey

I have ksp 1.8.1, RSS 18.1.3, and i have a little problem.

I was going to be out of fuel with my ship & so i decided to make an aerobraking in the very high jupiter's atmosphere (~1530km)

I was very surprised to see that my ship was accelerating. Obviously, all engines off.

I am also surprised to see that the Jupiter's atm is lower than Saturn's one, it does not make sense but in the datas i can find Saturn atm = 2000km & Jupiter atm = 1550 km , is it normal?

Is it the proof of dark energy?

##### Share on other sites

uhhh jupiter is larger than saturn so this should be normal more importantly how the heck are you surviving any kinda areobreaking in saturn or jupiter's atmospere?

##### Share on other sites

Posted (edited)

Jupiter is larger so it's atmoshere should be larger than Saturn's one..

In the very high atmopshere it's possible. Pressure is very low so not much overheat.

The doesn't explain why Jupiter's atmosphere is making my ship accelerate

Edited by Nopitch_
##### Share on other sites

Posted (edited)
22 hours ago, Nopitch_ said:

I was going to be out of fuel with my ship & so i decided to make an aerobraking in the very high jupiter's atmosphere (~1530km)

I was very surprised to see that my ship was accelerating. Obviously, all engines off.

That's not to be expected that high up in the atmosphere.  Even though you are inside the atmosphere, gravity is still accelerating your vessel toward periapsis.  The vessel is subjected to drag forces, but in the thin air of the upper atmosphere, the deceleration produced by drag is much less than the acceleration produced by gravity.  Therefore your vessel wil continue to pick up speed (but not as much as it would if there were no atmosphere).  It is not until you descend deeper into the atmosphere that drag begins to dominate over gravity and your vessel's speed will actually begin to decrease.

22 hours ago, Nopitch_ said:

I am also surprised to see that the Jupiter's atm is lower than Saturn's one, it does not make sense but in the datas i can find Saturn atm = 2000km & Jupiter atm = 1550 km , is it normal?

It is not an uncommon occrrence.  Jupiter's surface gravity is about 2.4 times greater than Saturn's, therefore its atmosphere is much more highly compressed.  Saturn's atmosphere, on the other hand, is more extended because of its lower gravity.  Although Jupiter's atmopshere is not as tall, it is much more dense and more massive than Saturn's.

Edited by OhioBob
spelling
##### Share on other sites

The fact my aposapsis increases still makes no sense, the trajectory before aerobraking was already taking account of the gravity of jupiter, so when i enter the atmosphere, YES i am accelerating, but there's no way my apoapsis increases..

In comparison making an aerobraking on Saturn or Venus in the very high atmosphere worked correctly, the ship was accelerating cuz of gravity but the apoapsis was decreasing..

For the atmophere height comparizon, this makes sense

thx

##### Share on other sites

3 hours ago, Nopitch_ said:

The fact my aposapsis increases still makes no sense, the trajectory before aerobraking was already taking account of the gravity of jupiter, so when i enter the atmosphere, YES i am accelerating, but there's no way my apoapsis increases.

I didn't realize your apoapsis was increasing.  (That's my fault for not watching the video.)  I don't know what's happening in that case, clearly something glitchy.  You might try asking about it in the RSS thread, maybe it's a known issue that other RSS players can explain.

##### Share on other sites

• 2 weeks later...

Thanks!

So it was real Dark Energy

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.