Mun to Minmus Polar Orbit Transfer

[Waxing_Kibbous]

Currently I have a Scansat in a polar orbit around the Mun and it still has quite a bit of fuel left, I'm thinking of sending it to Minmus when it is done scanning. I've done this before but it's usually really sloppy and wasteful- does anyone have any tips and tricks for such a transfer?

[Superfluous J]

Leave Mun when your polar orbit is perpendicular to Kerbin. When you can see Kerbin the entire time. Burn so you go prograde to Mun's orbit upon leaving Mun's SOI. You should only have to burn a TINY bit more than what you need to leave Mun's SOI.

Make your maneuver node so you just touch Minmus' orbit, and once in Kerbin's SOI make a maneuver node at that apoapsis to speed up or slow down a little (Speeding up is better but slowing down isn't that bad, so long as it's just a little bit) until you get a connection with Minmus. It helps if you set Minmus as a target, and remember Minmus' orbit is tilted so you may need to correct for that.

All told, everything after ejection from Mun should cost less than the ejection from Mun did.

[Reactordrone]

Since you're in a polar orbit you'll have to wait until you're at the right point in the Mun's orbit so that your Mun escape trajectory is tangential to the Mun's orbit (should be less than half a month). Raise your apoapsis to about the same as Minmus' orbit, adjust your plane to match Minmus when you're out there and then raise your periapsis to get an intercept with Minmus. it'll take a while but has fairly low delta-v (less than 250m/s).

[Palaceviking]

10 hours ago, Reactordrone said:

Since you're in a polar orbit you'll have to wait until you're at the right point in the Mun's orbit so that your Mun escape trajectory is tangential to the Mun's orbit (should be less than half a month). Raise your apoapsis to about the same as Minmus' orbit, adjust your plane to match Minmus when you're out there and then raise your periapsis to get an intercept with Minmus. it'll take a while but has fairly low delta-v (less than 250m/s).

This ^ plus(assuming a 50x50 orbit)- try to time your ejection as close to the ascending /descending node as possible,  fire 196ms (ish)prograde when going over the equator on the trailing side of the mun(forgot mun in 12 o'clock position, minmus at 5 o'clock)  should need about 80 ms to capture at minmus. 

Edit: mid course plane change about 6-10ms.

Total 270-350ms

Edited January 3, 2017 by Palaceviking
Math out, misplaced decimal,possible waffle bit drunk.

[Allocthonous]

Adding on to the previous posters, who all gave excellent advice, give yourself some lead time. Depending on the height of your orbit, if you plan your maneuver node when your orbit is perpendicular to kerbin, it may take so long to get around to the node that you're pointed significantly off from where you want to be when you make the burn. Before you reach a perpendicular orbit, plot a prograde maneuver node sufficient to eject you from munar orbit, then delay it by right clicking on the node and clicking the right hand button. If you look at the effect each delay (one orbit) has on your orbit around kerbin, you should be able to figure out exactly where the optimum ejection time is. Once you have that, you can go ahead and do the other adjustments to the node that are needed to reach minmus.