Accuracy mode not being accurate...

[DreamSphinx]

Hello. I seem to be having a problem with the accuracy mode. I'm pretty sure I'm using default settings on everything to do with the actual simulation, but no matter what, from 2009-2016, Mercury gets sucked into the Sun, which sends everything into chaos, which causes the Sun to start sucking up everything in the Solar System.

Anyone have any ideas as to how to fix this?

[abort_user]

how fast is your simulation? the faster it is the less accurate its going to be. you may be running to fast for the kind of accuracy you are looking for.

[Dan Dixon]

From the FAQ:
http://universesandbox.com/faq/#sim

As you turn up the time step you lower the accuracy of the simulation. If the accuracy is too low bodies will get thrown out of the system. The numbers: Mercury takes about 88 days to make a single orbit around the sun. A time step of 22 days would only be calculating a new position for Mercury 4 times in that period. This isn't enough accuracy to maintain a stable orbit. The Earth is further out and takes 365 days to orbit the sun. This same time step of 22 days results in about 16 position calculations for the Earth which is enough to maintain an orbit.
We're working on fixing this in the next version so that it automatically sub divides the time step if you turn it up too high.

We're working on fixing this in the next version so that it automatically sub divides the time step if you turn it up too high.

[DreamSphinx]

Oh, okay, that makes sense. Thanks for acknowledging this problem! Yeah, I had the simulation running a lot faster than normal, so that explains it. Thanks again!

[regurge]

From the FAQ:
http://universesandbox.com/faq/#sim

As you turn up the time step you lower the accuracy of the simulation. If the accuracy is too low bodies will get thrown out of the system. The numbers: Mercury takes about 88 days to make a single orbit around the sun. A time step of 22 days would only be calculating a new position for Mercury 4 times in that period. This isn't enough accuracy to maintain a stable orbit. The Earth is further out and takes 365 days to orbit the sun. This same time step of 22 days results in about 16 position calculations for the Earth which is enough to maintain an orbit.
We're working on fixing this in the next version so that it automatically sub divides the time step if you turn it up too high.

We're working on fixing this in the next version so that it automatically sub divides the time step if you turn it up too high.

that explain some things, i loaded the standard solar system and entered a 50 day time step and followed the earth - i had always another result. Sometime the earth gets kicked out of the solar system in 2050 sometimes in 2100 etc.

The funniest thing, after i changed to the accurate mode (should be more exactly?) the earth left the solar system in 2013 :D