Cant get into Moho Orbit

[JNA Space Program]

Now What. I cant and i dont know how. Ive tried everytjing that i know but i just cant. Need your Help Guys 

[nathan1]

Moho is tricky because it's both small and near the sun. The combination of these two things makes Moho have a very small sphere of influence, and on top of that KSP likes to just not tell you how close you are to an actual encounter when your orbit isn't close.

A couple things you can do:

1. Drop a maneuver at your apoapsis, right click on it to switch modes, then move it forward one orbit at a time. If your periapsis is close enough to Moho's orbit it should eventually give you a marker telling how close you'll get, but this could take a long time.
2. Make sure you perform your ejection burn from Kerbin at an appropriate transfer window (according to a transfer window calculator, such as here). Transfer windows will be at least a day long, so there is not a particular exact second when you need to do it.
3. When setting up your transfer maneuver for leaving Kerbin a mod that helps you fine-tune your maneuver node (such as Precise Node) can help.
4. In order to actually encounter Moho you'll need to be crossing Moho's orbit at the same time as either your ascending node or descending node (unless your relative inclination matches Moho's orbit), so you may need to perform another maneuver at one of those nodes to reduce your relative inclination to almost zero.

From the picture it looks like your periapsis may still be a little bit too far away from the sun to get an encounter with Moho.

[Scotius]

1. Leave Kerbin's SoI and enter Kerbol's orbit.

2. Set Moho as your target, and check where Ascending and Descending nodes are.

3. Depending on which one is closer, set a maneuver node and match your inclination with Moho's orbit.

4. When both orbits are on the same plane, drag Retrograde marker until your orbit intersects the orbit of Moho. Not by much, mind you - the bigger the angle of intersection, the bigger relative velocity of encounter will be.

5. Click-grab the newly created node, and drag it slowly back and forth along the orbit until you get encounter with Moho. Aim for longest encounter possible. Short encounter means high relative velicity, and less time for braking burn.

Couple of tips:

Try to get encounter near or at Moho's Apoapsis. The planet will move a bit slower there.

Pack plenty of dV and an engine with decent TWR. If TWR of your ship will be too low, you will zip past the Moho despite braking frantically all the way, and return to solar orbit.

NERV's are your friends - but you the bigger your ship, the more engines you will need to have high enough TWR.

Don't wait with the start of braking burn to the last moment. Start burning retrograde immediately after entering the SoI, and then set a maneuver node at Pe. This will give you a bit more time inside the SoI.

Moho is a nasty, vicious son of a Kraken and it hates you with a burning passion. Everyone loses ships going to Moho. Don't give up

[Vanamonde]

Since your question is not about real spaceflight, the thread has been moved to Gameplay Questions. 

[Plusck]

 

11 hours ago, JNA Space Program said:

Now What. I cant and i dont know how. Ive tried everytjing that i know but i just cant. Need your Help Guys 

From here, your main problem is that AN/DN are far from your Pe/Ap. This means that whatever you do, it'll be relatively expensive.

However, your AN doesn't look to be too far from Moho's Pe (the map doesn't actually tell you Moho's Pe relative to the sun, but you have to guessstimate). That means that if you burn right now - or ideally about an eighth of an orbit earlier than where you are - you should get an encounter at AN.

 

Getting a good encounter, however, will be necessarily slow and a touch compicated.

1) simplest option: place a maneuvre node behind you (I'd guess about halfway between your ship and DN) and pull retrograde until you get the target chevrons appearing on the orbit. Then drop a second node just after your ship's position chevron which should be near AN. Then add a third node about where your ship is now. This third node is 2 orbits later than where you are. If the target chevrons are close, great. If not, add orbits to the third node until it they are relatively close. Then go back to the second node and add prograde/retrograde until you get an encounter.

2) better option: it looks like you should be able to get an encounter within two orbits from here. Place a first node between AN and Pe. Leave it be for now. Place a second node between your ship and DN. Add retrograde on this until the target chevrons appear, then back up a bit until they disappear and add some anti-normal (not too much, you want this to be a small fraction of the total cost of the burn) until the target chevrons reappear; this should move AN a touch closer to Pe. Again, remove some of the retrograde until the chevrons just disappear, then drag the node around that part of the orbit until they appear again (the idea is to get the most efficient location for the burn in that area). If they are close, go back to the first node and add pro/retrograde; if they are far, right-click and add an orbit (or two) to the second node before going back to the first node. You should now have an encounter.

 

However, to avoid great problems wth Moho, you should start off with a better approach:

• forget about launch windows - they are unlikely to give the best result
• for a cheap trip, launch when opposite to the part of Moho's orbit which is closest to the sun. It is much more expensive if Moho is at its furthest from the sun when you intercept.
• transfer from Kerbin when Kerbin's orbit crosses Moho's orbit. Launch at midday or midnight into an orbit which is angled in the opposite direction to Moho's, by about 15°. Do NOT leave Kerbin's SOI before doing the transfer burn.
• plot your burn until you get the target chevrons to appear.
• drop a node at Pe (next to those target chevons); drop a second node a quarter of an orbit later; go back to first node and plot a retrograde burn until you get an encounter (which will be one orbit later).

[Aethon]

What's your relative inclination with Moho?

How much fuel do you have?

The best way is to leave for Moho when Kerbin crosses Moho Ascending node.  You can combine your inclination burn with your Kerbin escape burn and save dv.  

Scroll down this links page and read Maccollos post : 

 

[Plusck]

15 minutes ago, Aethon said:

What's your relative inclination with Moho?

How much fuel do you have?

The best way is to leave for Moho when Kerbin crosses Moho Ascending node.  You can combine your inclination burn with your Kerbin escape burn and save dv.  

Scroll down this links page and read Maccollos post : 

 

Absolutely agree.

The only problem with that thread you linked is that there are a bunch of people saying completely wrong things for the first half of the thread. You have to go to near the end of the thread to get the right info.

When you burn from Kerbin, your speed at your solar Pe is going to be high. If you dip deeper down to Moho's Pe, it will be higher still.

However, Moho's orbital velocity varies enormously too.

And it turns out that - in all cases and for all planets - if you are trying to intercept a planet on an eccentric orbit you want to do this at the point that is furthest from your starting orbit.

So for Moho, that means intercepting at Moho's Pe gives the smallest capture burn. And conversely for Eeloo, the smalllest capture burn is when Eeloo is at its Ap.

[Foxster]

I'd use MechJeb. It's like what real astronauts would use.