Help with putting an satelite in fixed position for contract

[magnemoe]

Contract was to put an satellite directly above an marker in geostationary orbit.
From LKO the burn to geo was 1:30, kerbin uses 6 hour to rotate so it should rotate 90 degree in 1:30, I messed this up somehow so I ended behind by around 120 degree. 

Now I thought I could lower Pe, giving me an 4 hour orbit and I would catch up with the position and circulate but I ended up 60 degree ahead. 
What is I doing wrong.

[DrLicor]

13 minutes ago, magnemoe said:

From LKO the burn to geo was 1:30, kerbin uses 6 hour to rotate so it should rotate 90 degree in 1:30, I messed this up somehow so I ended behind by around 120 degree. 
 

1minutes and 30 secs burntime I suppose? In that burn, kerbin doesn't rotate 90 degree, it does rotate 90 degree in 1hour and 30 minutes.

Lowering you Pe to an orbital time is indeed the right way to give get sat 120 degree forward.

 

Edited September 29, 2016 by DrLicor

[steuben]

You may have to wait a bit.

What I end up doing is getting the satellite's AP up to the right height, and my PE down around 80-70 km. Then I sit and wait for the sat to be at AP and the visibility location in line of sight. Then I just burn to raise the PE. That's the simple way.

The NASA way is to launch to parking orbit. Wait to raise your AP until it will be over the location. Then burn to circularize when it gets up there.  But that requires either some heavy planning and/or orbit tools, or quicksave/reverts.

[eddiew]

37 minutes ago, steuben said:

What I end up doing is getting the satellite's AP up to the right height, and my PE down around 80-70 km. Then I sit and wait for the sat to be at AP and the visibility location in line of sight. Then I just burn to raise the PE. That's the simple way.

This would be my method too. You don't have to do it with a planned manoeuvre, you can just timewarp for a few loops until the ground is in the right place, then circularise  

[magnemoe]

1 hour ago, DrLicor said:

1minutes and 30 secs burntime I suppose? In that burn, kerbin doesn't rotate 90 degree, it does rotate 90 degree in 1hour and 30 minutes.

Lowering you Pe to an orbital time is indeed the right way to give get sat 120 degree forward.

 

Yes its obvious 1:30:00
 

[DrLicor]

@magnemoe haha still don't understand, is it 1u30min? or 1min30sec?

Because how can you burn for 1,5 hours?

[magnemoe]

1 hour ago, steuben said:

You may have to wait a bit.

What I end up doing is getting the satellite's AP up to the right height, and my PE down around 80-70 km. Then I sit and wait for the sat to be at AP and the visibility location in line of sight. Then I just burn to raise the PE. That's the simple way.

The NASA way is to launch to parking orbit. Wait to raise your AP until it will be over the location. Then burn to circularize when it gets up there.  But that requires either some heavy planning and/or orbit tools, or quicksave/reverts.

I used an parking orbit first, however I think I launched wrong, 30 degree ahead not 90. 

Now I have to wait, don't have fuel to do much more than circulating. 

[DrLicor]

When launching more than one sat in 1 orbit, I always use 1 rocket to carry them all. So there parking orbit is the same, most of the time AP on 2683.3 and orbital time of 4 hours, every orbit I launch a sat to a circulair orbit so they are all 120 degree apart.

In your case I would have launched the sat in a parking orbit with Ap on 2683.3 and an orbital period of 350min=5hours and 50min (so every orbit the sat has moved 10 degree) Than wait till its above the objective, and it circulair

[magnemoe]

9 hours ago, DrLicor said:

@magnemoe haha still don't understand, is it 1u30min? or 1min30sec?

Because how can you burn for 1,5 hours?

It takes one and an half hour for probe to reach Ap after burn, 
Since Kerbin will rotate 90 degree before you reach Ap the burn should be timed so. 
A lot like setting an deorbit burn to land at position and have to adjust it as Kerbin or Mun rotates.