Newbie here

Spaceman · Post #1by **Spaceman** » 11.02.2007, 08:48

Hello my friends

. My name is Elias Loukas and i am a new user of Celestia. This programe is great and i love it

. Of course i have lots of questions about Celestia and add-ons. I also would like to create new add-ons, so i need your help.

First question. Some days ago i downloaded the Moonships from Motherlode. I like them, but not orbiting around Earth. So i but them around Moon :mrgreen:

. Now i would like to put them closer to the Moon. How can i do this?

bh · Post #2by bh » 11.02.2007, 11:55

Have a look at 'spacecraft.ssc'... that should give you some clues. Glad you're enjoying Celestia spaceman!

Post #3by **selden** » 11.02.2007, 12:35

Spaceman,

The size of an orbit is specified with the SSC variable SemiMajorAxis

When a body orbits closer to another object, you should decrease its Period, too: it orbits faster. But if you don't want to calculate the correct period,] you can pretend the spacecraft are under power.

Spaceman · Post #4by **Spaceman** » 11.02.2007, 19:58

I find it

I notice that in SemiMajorAxis 5000 the moonship-1 is now 3.262 Km from the Moon. I guest that the distance (5000) is from the center of the object, not the surface.

When a body orbits closer to another object, you should decrease its Period, too: it orbits faster.

Third Law of Kepler, isn't?

Post #5by **selden** » 11.02.2007, 20:32

Center & 3rd, yes.

Spaceman · Post #6by **Spaceman** » 11.02.2007, 20:43

Thanks for the help