Retrograde orbit dv.

[CaptainKipard]

I started capturing asteroids, and I've discovered that a retrograde orbit insertion requires a bit more dv than a regular one.

Is there a rough ratio or calculation that would let me judge how much I need for each planet and moon?

Edited April 27, 2014 by Cpt. Kipard

[Kasuha]

You don't need different dv to insert into retrograde orbit from space. From surface, the difference is about twice the body's surface rotation speed (sidereal rotational velocity) which can be found on Wiki. For instance Kerbin has surface rotation speed 174.53 m/s so to launch into retrograde orbit you need about 350 m/s more than to launch into prograde orbit.