Custom Expressions for Orbital Mechanics (No Mods)

Theres so much dude how does all of this work pls explain

@Tweedle_Aerospace ok

@Vedhaspace it defines the angular position of an orbit along with true anomaly and eccentric anomaly

@Tweedle_Aerospace what is mean anomaly?

@sflanker does the m in the true anomaly stand for the mean anomaly?

@sflanker yep. At first I accidentally told it to rotate 180 radians which was a horrible mistake. Then I converted to degrees and inputed 3.142. It ended up getting the same result. I will try 90 and see what happens.

@Tweedle_Aerospace I'm not sure what the result would be, it should probably be the same as the original value, but I haven't tested it.

@sflanker one last one: can I rotate a point on the surface around (0, 0, 0) and it succeed.

@sflanker it seems that worked. Although now I am trying to calculate the hohmann transfer. It seems when I use the vis viva equation it comes back with either NaN or a rapidly shrinking number that turns into NaN.

@Tweedle_Aerospace Certainly, if you know eccentricity and periapsis you can find SMA by simply rearranging the terms: a = P / (1 - e)

@sflanker could I “reverse engineer” the periapsis equation to find the semi-major axis?

@sflanker thanks! I knew how to calculate them. I am going to use it for a custom career mode I have been working for a while. I started it out as a little building that just displayed the missions. But MFD’s have made it possible to add points and upgrades. (Trust me this wasn’t taken from Gonzonya. I am not going to release it because people will say it is though.)

Here is a link with some more information.

@Tweedle_Aerospace Yes, the periapse distance, or perigee, is equal to the semi-major axis times one minus eccentricity P = a * (1 - e), and the apoapse distance, or apogee, is equal the semi-major axis times one plus eccentricity. This holds true for both elliptical and hyperbolic orbits (for hyperbolic orbits (1 - e) becomes negative because e > 1, but semi-major axis is also negative for hyperbolic orbits). Parabolic orbits are special snowflake, but I just pretend they don't exist. You can use the custom expressions on this craft to get semi-major axis and eccentricity from velocity and position.

Is there any way to calculate a crafts perigee from just altitude, velocity, and position?

@Kulkule i miss the old command pod to.

We miss you old command pod

This is the root of all vizzy

AAAA, LIKE A LOT OF ITEMS

this is very helpful.
Thank you very much (sflanker)