My Mun encounter trajectory intersects the Mun. Is this optimal?
My encounter trajectory is pictured below. From a fuel-efficiency standpoint, is it optimal for my encounter burn to intersect the Mun, then perform another burn to curve my periapsis out to a reasonable height, or should I attempt to avoid intersecting the Mun on future encounter burns?
Best Answer
MBraedley pretty much nailed it, but I wanted to add a visual representation for reference. This is a screenshot of an image taken from An Idiot Proof Guide to Landing on the Mun. Basically, you'll want to setup a maneuver while you are still in Kerbin's orbit (which is easier if you set the Mun as your "target"):
As you can see, this particular maneuver will bring the spacecraft in question within 243,355m of the Mun. You definitely do not want your trajectory to intersect the Mun. It will also become increasingly difficult (and require more fuel) to alter your course as you get closer to the Mun.
Once you create a maneuver node to plan your burn, make note of the estimated burn time. You'll want to start your burn at half of that time to hit your target exactly.
If you have completed your burn, and your periapsis is not quite where you want it, it is usually safe to make an adjustment. I have had success with making small adjustments to my intended orbit using RCS. But these are all things that you'll want to do before entering the Mun's sphere of influence.
Pictures about "My Mun encounter trajectory intersects the Mun. Is this optimal?"
How do you land efficiently on Mun?
If you want to reach the Mun on the first swing around, wait until Mun rises just above the horizon. A good rule of thumb is for each 100 km you are above Kerbin, wait another 2 seconds. Once it does, begin a forward burn, and keep an eye on your map, as the apoapsis moves out towards Munar orbit.How close can you orbit the MUN?
There are anomalous geological formations that can be found on the surface of the Mun. Synchronous orbit around the Mun is not possible, since it would have to occur at an altitude of 2 970.58 km, beyond the Mun's sphere of influence.How much delta v Do you need to get back from the MUN?
Specifications. Recommended Delta-V: ~ 6,500 for Orbit and Return. ~ 7,500 for Landing and Return.Kerbal Space Program 0.23 - Beginners Guide \u0026 Tutorial - Part 4 Orbiting the Mun
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Tom Fisk, Tom Fisk, RODNAE Productions, Antony Trivet