IMFD Target a vessel in DRO around Moon

Abdullah Radwan

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Hello,

I am trying to assemble LOP in a DRO around the Moon. I sent PPE in a stable DRO around the Moon. Now I want to send the HAB module to it. I am following this video:


The problem now I have to reference the Moon in Map program, but when I set it I can't target PPE. I can target it only if the Earth is the reference.

My plan is to set the line of nodes above my periapse (Not sure if this useful), then make a burn to reduce the apoapsis to 70M. At apoapsis, I'll set the target intercept program to target the PPE. To go into DRO (Without targeting anything) I need to have an inclination of 180 degrees, burn at periapsis to reduce apoapsis to 70M, then burn at apoapsis to enter a stable DRO using Lagrange MFD. I want to do the same with targeting PPE, how I can do it?

Here is a video showing the problem:

https://drive.google.com/file/d/1OmgoHGLrqzbxoO1xmgHw874n2qGR34-g/view?usp=sharing

Thanks in advance.
 

BrianJ

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Hi,
trying to intercept a vessel in a perturbed orbit (DRO) - sounds like an interesting problem. Maybe IMFD "Map" can be useful?
Can you post a scenario where you are planning the intercept?
Thanks,
BrianJ
 

Abdullah Radwan

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Hi,
trying to intercept a vessel in a perturbed orbit (DRO) - sounds like an interesting problem. Maybe IMFD "Map" can be useful?
Can you post a scenario where you are planning the intercept?
Thanks,
BrianJ
Thanks for replay.

The scenario is attached below. It's an Orion docked with HAB module after TLI. The target is PPE_MODULE orbiting in Moon DRO. You'll need to have SLS installed.
 

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BrianJ

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Hi,
I had a look at the scenario - and I have to say that I have found no way to even get close to an intercept! We need a navigation tool that can do numerical trajectory propagation for both focus vessel and target (IMFD Map only does that for focus vessel).

So, we need to look outside Orbiter for software to do this.

Although, I wonder if it might be possible to get into a roughly similar DRO to the target, and then creep up on it in a "phasing orbit" manner.

Interesting Orbiter problem, though :)

Cheers,
BrianJ
 

dgatsoulis

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I agree with Brian in the strategy he proposed. The best you can do is arrive at the Moon in an orbit with similar characteristics as the target and set it up in such a way that your arrival gets you close to it.

 
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Abdullah Radwan

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I agree with Brian in the strategy he proposed. The best you can do is arrive at the Moon in an orbit with similar characteristics as the target and set it up in such a way that your arrival gets you close to it.

SlaveMFD is extremely helpful in this situation, since you can open an IMFD instance "hooked" at the target, showing you its real perturbed trajectory around the Moon using the Map program.

Video of the flight below:

Rendezvous with a target in a Distant Retrograde Orbit (DRO) around the Moon - YouTube

Thanks a million! You are a genius, man!


I'll try to re-do this. Can you share the spreadsheet link so I can use it? It will be better if you shared the whole folder contains the spreadsheets.
 

dgatsoulis

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Thanks a million! You are a genius, man!


I'll try to re-do this. Can you share the spreadsheet link so I can use it? It will be better if you shared the whole folder contains the spreadsheets.

Here is the link to the spreadsheet.
To be able to use it, press File→Create copy

It's been many years since I first started it and there are a lot of different calculations in each tab. It was for personal use, so it's not very user-friendly, but hopefully you'll find a few handy things in there.

:cheers:
 

Abdullah Radwan

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Here is the link to the spreadsheet.
To be able to use it, press File→Create copy

It's been many years since I first started it and there are a lot of different calculations in each tab. It was for personal use, so it's not very user-friendly, but hopefully you'll find a few handy things in there.

:cheers:

Thanks for sharing it.


I've tried to make it in another scenario but I failed.


First I switched to PPE_MODULE to see what's the best time. the result was stage 5 which is ~1.276M seconds away and 93.69M altitude. I switched to Orion and start to prepare. I was ~841K seconds away from PeA. I entered the number in the modified sheet. That gives me I'll arrive after ~1.321M seconds at ApA. I made the burn and lowered the PeA to 60K and 175 degrees Rinc to Equator. At PeA I made the breaking burn which took ~175 DV. But the ApT was ~800K seconds, not 480K seconds as calculated in the sheet! I gnored this and wait until ApA. I noticed that I was moving in and out of PPE_MODULE. At ApA I used velocity match program but I was too far away (80M). I waste all of my fuel trying to go there (Closest approach was 53M). What's the mistake I did?
 

dgatsoulis

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Thanks for sharing it.


I've tried to make it in another scenario but I failed.


First I switched to PPE_MODULE to see what's the best time. the result was stage 5 which is ~1.276M seconds away and 93.69M altitude. I switched to Orion and start to prepare. I was ~841K seconds away from PeA. I entered the number in the modified sheet. That gives me I'll arrive after ~1.321M seconds at ApA. I made the burn and lowered the PeA to 60K and 175 degrees Rinc to Equator. At PeA I made the breaking burn which took ~175 DV. But the ApT was ~800K seconds, not 480K seconds as calculated in the sheet! I gnored this and wait until ApA. I noticed that I was moving in and out of PPE_MODULE. At ApA I used velocity match program but I was too far away (80M). I waste all of my fuel trying to go there (Closest approach was 53M). What's the mistake I did?

The orbital period calculation in the spreadsheet is strictly 2 body Keplerian. The 93.69M ApA that you aimed for is so far outside the Moon's SOI that produces that large discrepancy you saw.

If a direct (or in this case 2 burns) approach doesn't get you near your target, you can treat this as any other phasing problem. If you are arriving "ahead" of your target, go higher and let it catch up to you and if you are arriving "behind", go lower and catch up to it.

When you can, post the scenario to have a better look.
 

Abdullah Radwan

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The orbital period calculation in the spreadsheet is strictly 2 body Keplerian. The 93.69M ApA that you aimed for is so far outside the Moon's SOI that produces that large discrepancy you saw.

If a direct (or in this case 2 burns) approach doesn't get you near your target, you can treat this as any other phasing problem. If you are arriving "ahead" of your target, go higher and let it catch up to you and if you are arriving "behind", go lower and catch up to it.

When you can, post the scenario to have a better look.

Thanks for the explanation. I don't actually know how to treat this. Would be great if you explain it.


The scenario is attached. Orion with HAB and PPE module in DRO just after MCC to 100K PeA at Moon.
 

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dgatsoulis

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Thanks for the scenario, I'll have a look later. Would you mind also posting a scenario before the TLI burn at LEO parking orbit? I don't see why you can't just go directly for the target, so I want to give it a try from your starting point.

I've already done a couple of tests, (launch from KSC on a random date) and so far I've been successful at arriving directly within 5M from the target. DV expenditure after TLI is in the 700 m/s range.

EDIT: I don't have the SLS installed and I don't want to install it just for this. The scenario you posted is a bit confusing with too many vessels in it. Would you mind setting up a scenario with just 2 DeltaGliders in the same trajectories as the "source" and "target" vessels?
 
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Abdullah Radwan

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Thanks for the scenario, I'll have a look later. Would you mind also posting a scenario before the TLI burn at LEO parking orbit? I don't see why you can't just go directly for the target, so I want to give it a try from your starting point.

I've already done a couple of tests, (launch from KSC on a random date) and so far I've been successful at arriving directly within 5M from the target. DV expenditure after TLI is in the 700 m/s range.

EDIT: I don't have the SLS installed and I don't want to install it just for this. The scenario you posted is a bit confusing with too many vessels in it. Would you mind setting up a scenario with just 2 DeltaGliders in the same trajectories as the "source" and "target" vessels?

Sorry for this. I don't know how to replace vessels. Anyway here is a scenario with Orion in LEO and the PPE module in Moon DRO. Thanks for help.
 

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BrianJ

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That's some awesome Orbiter astrogation, dgatsoulis! :thumbup:
Many thanks.
 

Donamy

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Did that really take 2 years ?
 

dgatsoulis

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Did that really take 2 years ?

Two years? to what are you referring? This is a 7 - 10 day flight.

Sorry for this. I don't know how to replace vessels. Anyway here is a scenario with Orion in LEO and the PPE module in Moon DRO. Thanks for help.

Here is a video of the flight from LEO to the target from the scenario you posted. Added a lua script showing dV expenditure and time.


The scenario is attached. Orion with HAB and PPE module in DRO just after MCC to 100K PeA at Moon.

The scenario attached on that post doesn't have a single vessel in a Trans lunar trajectory. Some vessels are landed on Earth, others are on LEO and the PPE module is in the DRO. So can't help with that particular question.

I've been thinking of a different way to perform this flight using two or three instances of Lagrange MFD. I'll give it a shot later and see how it goes.
 

Abdullah Radwan

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Here is a video of the flight from LEO to the target from the scenario you posted. Added a lua script showing dV expenditure and time.

Rendezvous with a target in a Distant Retrograde Orbit (DRO) around the Moon 2 - YouTube

I've been thinking of a different way to perform this flight using two or three instances of Lagrange MFD. I'll give it a shot later and see how it goes.

Thanks for doing the video! I've applied it and I successfully meet with PPE and dock the first piece of LOP!

orbiter_2018-09-28_09-29-29.png


But I didn't succeed with another flight (Deliver airlock module). I end up with 32M away and very little fuel (1000 KG) wasted while trying to approach. I add a 10 m/s and after some time it got back to zero. In the sucessfull attempt, I end up also 32M away but with much more fuel (4000 KG) and when add 10 m/s it increases to 20 m/s (So like free boost). Note that Orion has got 1160dv after TLI burn (After separate from SLS). The scenario is attached before TLI burn.
 

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dgatsoulis

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Thanks for doing the video! I've applied it and I successfully meet with PPE and dock the first piece of LOP!

orbiter_2018-09-28_09-29-29.png


But I didn't succeed with another flight (Deliver airlock module). I end up with 32M away and very little fuel (1000 KG) wasted while trying to approach. I add a 10 m/s and after some time it got back to zero. In the sucessfull attempt, I end up also 32M away but with much more fuel (4000 KG) and when add 10 m/s it increases to 20 m/s (So like free boost). Note that Orion has got 1160dv after TLI burn (After separate from SLS). The scenario is attached before TLI burn.

As I've mentioned before, I don't have the SLS installed, so I can't note the Orion's dv at any point.

To try this, I need a scenario with two Deltagliders in it. One that is the "source" vessel and one that is the "target" vessel. I also need a dv budget for the "source" vessel (which you kind of provided: "1160dv after the TLI burn").

You mentioned here that:
I don't know how to replace vessels.

I'll show you how to do it here, so that in the future, you can provide example scenarios without other people needing to download and install addons that they might not want or need.

Two notes before we proceed:

1. I don't mean to sound patronizing or anything like that. This is just to make it easier for you to get help when you post a navigation problem in Orbiter Forum.

2. I don't mean any disrespect to the SLS team. It's a magnificent, very well made addon and a great many thanks to all involved in creating it. It's just that it doesn't "fit" in my current Orbiter installation and I don't want to have to download it, just to solve a navigation problem.

With that said, let's begin. Here is the scenario you posted. I've added comments on what "stays", what "goes" and what changes. Here is a brief summary:
1. Between the BEGIN_DESC - END_DESC lines, enter a simple description of what the objective is.
2. The solar system in the BEGIN_ENVIRONMENT-END_ENVIROMENT lines is addon-specific, so it needs to change to Orbiter's default Sol system.
3. Everything with a "Landed" status needs to go. No need for those ships in the scenario.
4. If there are any ships attached or docked to each other, just keep one of them. The first in scenario order.

Code:
BEGIN_DESC ; 
StateSaver Autosave:


System Time:

Fri Sep 28 14:39:22 2018


Simulator MJD:

61396.242742


Focus Vessel:

SLS


Relative Body:

Earth


Altitude:

244.359k



END_DESC

[COLOR="Red"];The lines above should change to:
;BEGIN_DESC
;Rendezvous with the Target vessel
;END_DESC[/COLOR]

BEGIN_ENVIRONMENT
  System Sol_SLS
  Date MJD 61396.2427453525
  Help SLS Block 1B Cargo Launch Pad
END_ENVIRONMENT

[B];The lines above should change to:
;BEGIN_ENVIRONMENT
;  System Sol
;  Date MJD 61396.2427453525
;END_ENVIRONMENT[/B]

BEGIN_FOCUS
  Ship SLS [COLOR="red"]; Change to Ship Source[/COLOR]
END_FOCUS

BEGIN_SHIPS
SLS:Multistage2015 [COLOR="red"]; Change to  Source:Deltaglider[/COLOR]
  STATUS Orbiting Earth
  RPOS 3575537.738 -246687.364 -5560232.611
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -0.623
  VROT -0.0049 0.0467 0.0000
  AFCMODE 7
  PRPLEVEL 0:0.680146 [COLOR="red"];Everything below this line can go[/COLOR]
  THLEVEL 0:1.000000 1:1.000000 2:1.000000 3:1.000000
  NAVFREQ 0 0 0 0
  XPDR 0
  CONFIG_FILE Config\Multistage2015\SLS_BLOCKIBTESTNEW.ini
  GUIDANCE_FILE Config\Multistage2015\Guidance\SLS_EM2_Orion_GNC.txt
  CONFIGURATION 1
  COMPLEX 
  CURRENT_BOOSTER 7
  CURRENT_STAGE 2
  CURRENT_INTERSTAGE 1
  CURRENT_PAYLOAD 1
  FAIRING 0
  MET 3484.245
  GROWING_PARTICLES 
  STAGE_IGNITION_TIME 477.073395
  STAGE_STATE 2
  TELEMETRY_FILE Config\Multistage2015\Telemetry\SLS_EM1_Orion_GNC.txt
  ALT_STEPS 200.0,350.0,1400.0,35000.0
  PEG_PITCH_LIMIT 35.000
  PEG_MC_INTERVAL 0.100
END
vab:SLSVABEM2 [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6515520 28.5843740
  HEADING 76.01
  ALT -0.284
  AROT 37.074 -69.680 25.299
  AFCMODE 7
  NAVFREQ 0 0
  XPDR 0
  Light 1350565888 
  DOOR1 0 0.0000
  DOOR2 0 0.0000
  DOOR3 0 0.0000
  DOOR4 0 0.0000
  DOOR5 0 0.0000
  DOOR6 0 0.0000
  EM1A 0 0.0000
  EM1B 0 0.0000
  EM1C 0 0.0000
  EM1D 0 0.0000
  EM1E 0 0.0000
  EM1F 0 0.0000
  EM1G 0 0.0000
  EM1H 0 0.0000
  EM1J 0 0.0000
  EM1K 0 0.0000
END
SLSTOWER2016EM2:SLSTOWER2016EM2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6208906 28.6272639
  HEADING 180.26
  ALT 75.714
  AROT -117.993 -4.170 171.728
  AFCMODE 7
  NAVFREQ 0 0
  XPDR 0
  CAA 0 0.0000
  LAUNCH 0 0.0000
  TOUCH -75.9000 
  BEACON 0 
END
LP39_SLS:SLS_PadA  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6208910 28.6267320
  HEADING 270.00
  ALT 1.997
  AROT -180.000 80.621 118.627
  AFCMODE 7
  NAVFREQ 0 0
END
SPOTLIGHT1:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -29.1959147 2.4561787
  HEADING 66.68
  ALT 0.186
  AROT 25.070 -22.265 75.772
  ATTACHED 0:0,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 1.0472
  PAT 28.0000 24.0000 47.7000 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.48971 0.51309
END
SPOTLIGHT2:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -29.3783550 2.4074486
  HEADING 66.68
  ALT 0.186
  AROT 25.110 -22.449 75.730
  ATTACHED 0:1,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 1.0472
  PAT 94.2500 40.0000 50.2500 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.52019 0.65339
END
SPOTLIGHT3:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -29.8439529 2.2257810
  HEADING 66.66
  ALT 0.186
  AROT 25.244 -22.932 75.661
  ATTACHED 0:2,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 1.5708
  PAT -36.0000 40.0000 55.0000 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.58580 0.39287
END
SPOTLIGHT4:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -30.5357169 1.9577504
  HEADING 66.64
  ALT 0.186
  AROT 25.437 -23.652 75.557
  ATTACHED 0:3,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 1.0472
  PAT -36.0000 40.0000 -57.5000 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.67167 0.16119
END
SPOTLIGHT5:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -35.1000667 0.9537060
  HEADING 66.58
  ALT 0.186
  AROT 26.650 -28.108 74.141
  ATTACHED 0:4,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 0.3491
  PAT 57.0000 24.0000 -56.5000 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.69450 0.96209
END
SPOTLIGHT6:spotlight2  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -36.6896990 0.5215900
  HEADING 66.57
  ALT 0.186
  AROT 27.139 -29.681 73.670
  ATTACHED 0:5,LP39_SLS
  AFCMODE 7
  NAVFREQ 0 0
  SPT 1 300.0000 1.0472
  PAT 95.5000 37.0000 -54.7500 0.0000 1.0000 0.0000 0.0000 0.0000 1.0000
  GBL 0.58791 0.88999
END
WATERTOWER:SLS\WATERTOWER  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6198650 28.6281920
  HEADING 0.00
  ALT 1.997
  AROT 61.695 4.479 8.250
  AFCMODE 7
  NAVFREQ 0 0
END
LIGHTNING1:SLS\LIGHTNINGTOWER  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6221750 28.6274220
  HEADING 0.00
  ALT -0.194
  AROT 61.308 4.534 8.218
  AFCMODE 7
  NAVFREQ 0 0
  XPDR 0
END
LIGHTNING2:SLS\LIGHTNINGTOWER  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6194350 28.6275920
  HEADING 0.00
  ALT -0.194
  AROT 61.308 4.535 8.220
  AFCMODE 7
  NAVFREQ 0 0
  XPDR 0
END
LIGHTNING3:SLS\LIGHTNINGTOWER  [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6198650 28.6257520
  HEADING 0.00
  ALT -0.194
  AROT 61.310 4.534 8.220
  AFCMODE 7
  NAVFREQ 0 0
  XPDR 0
END
Orion:Orion-MPCV\Orion-MPCV  [COLOR="red"];This is attached to the SLS. We have kept the SLS, so this can go. [/COLOR]
  STATUS Orbiting Earth
  RPOS 3575555.646 -246685.316 -5560222.555
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -0.623
  VROT -0.0049 0.0467 0.0000
  ATTACHED 1:0,SLS
  AFCMODE 7
  PRPLEVEL 0:1.000000
  NAVFREQ 0 0
  XPDR 468
  MODE 0
END
CRAWLER:SLSCRAWLERNEW [COLOR="red"];Status landed, This goes[/COLOR]
  STATUS Landed Earth
  POS -80.6209190 28.6170143
  HEADING 358.05
  ALT -0.137
  AROT 60.670 6.591 7.487
  AFCMODE 7
  NAVFREQ 0 0
END
PPE_MODULE:NEWPPB [COLOR="red"];This is the Target. Change to: Target:Deltaglider[/COLOR]
  ANT1 1 0.0000[COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  AIRLOCK 1 0.0000 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  IONARM 1 0.0000 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  PANEL1 1 1.0000 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  SOLP 0 0.0000 1 0.7913 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  PANELEXT 1 1.0000 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  PANELEND 1 1.0000 [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  eng_conf 0  [COLOR="red"] ;this line goes (addon-specific)[/COLOR]
  STATUS Orbiting Sun
  RPOS 115242127.272 15130892.303 147424553167.389
  RVEL -31584.6029 9.9831 459.2309
  AROT 72.521 81.738 -7.939
  VROT 0.0177 0.0030 -0.0000
  AFCMODE 7
  PRPLEVEL 0:0.875865
  DOCKINFO 0:1,HAB_MODULE [COLOR="red"] ;this line goes [/COLOR]
  NAVFREQ 0 0
  XPDR 0
END
HAB_MODULE:HAB1 [COLOR="red"];Docked to PPE_MODULE. This goes, we have kept the PPE as the Target[/COLOR]
  STATUS Orbiting Sun
  RPOS 115242119.580 15130893.369 147424553167.724
  RVEL -31584.6031 9.9831 459.2285
  AROT 72.521 81.738 -7.939
  VROT 0.0177 0.0030 -0.0000
  AFCMODE 7
  DOCKINFO 1:0,PPE_MODULE
  NAVFREQ 0 0
END
[COLOR="red"];The rest of the ships go. Either addon-specific or attached to vessels already kept.[/COLOR]
sls_2016/spacecraftadapter:Stage
  STATUS Orbiting Earth
  RPOS 3575554.084 -246685.495 -5560223.432
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -90.623
  VROT 0.0467 0.0049 0.0000
  ATTACHED 0:1,SLS
  AFCMODE 7
  NAVFREQ 0 0
END
SLS_2016\NEWUSA1:Stage
  STATUS Orbiting Earth
  RPOS 3575544.019 -246686.646 -5560229.083
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -90.623
  VROT 0.0467 0.0049 0.0000
  ATTACHED 0:2,SLS
  AFCMODE 7
  NAVFREQ 0 0
END
AIRLOCK_MODULE:dsg1
  STATUS Orbiting Earth
  RPOS 3575544.887 -246686.546 -5560228.596
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -90.623
  VROT 0.0467 0.0049 0.0000
  ATTACHED 0:3,SLS
  AFCMODE 7
  NAVFREQ 0 0
END
Orion-LAS:Orion-MPCV\Orion-MPCV-LAS
  STATUS Landed Earth
  POS -71.1824254 28.1278706
  HEADING 98.85
  ALT 1.988
  AROT -28.481 -73.471 89.066
  AFCMODE 7
  NAVFREQ 0 0
END
Wreck:AresWreck
  STATUS Orbiting Earth
  RPOS -55515261.866 64002497.845 -7946202.336
  RVEL -26945.8024 35265.1233 -5453.0618
  AROT 21.344 -12.900 1.646
  VROT 0.4458 -0.9763 -1.6906
  AFCMODE 7
  PRPLEVEL 1:0.997920
  THLEVEL 1:1.000000
  NAVFREQ 0 0
END
END_SHIPS

[COLOR="Red"];no need for any of these lines below[/COLOR]
BEGIN_DX9ExtMFD
END

BEGIN_ReFuelMFD
  SCENARIO_TREE 
    NAMED Computers
    END_NODE 
  END_NODE 
END

So the scenario above turns into:

Code:
BEGIN_DESC
Rendezvous with the Target vessel
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 61396.2427453525
END_ENVIRONMENT

BEGIN_FOCUS
  Ship Source
END_FOCUS

BEGIN_SHIPS
Source:Deltaglider
  STATUS Orbiting Earth
  RPOS 3575537.738 -246687.364 -5560232.611
  RVEL 7604.1184 872.4548 4301.0132
  AROT 11.507 -60.186 -0.623
  VROT -0.0049 0.0467 0.0000
  AFCMODE 7
  PRPLEVEL 0:0.680146
END
Target:Deltaglider
  STATUS Orbiting Sun
  RPOS 115242127.272 15130892.303 147424553167.389
  RVEL -31584.6029 9.9831 459.2309
  AROT 72.521 81.738 -7.939
  VROT 0.0177 0.0030 -0.0000
  AFCMODE 7
  PRPLEVEL 0:0.875865
  NAVFREQ 0 0
  XPDR 0
END
END_SHIPS

One last step. Here is where you provide the dv budget for the "Source" ship. If you have BurnTimeCalcMFD installed, run the scenario you created, open BTC and set the fuel of the "Source" ship with the scenario editor.
Also add a few kg of RCS. Exit and open the (Current State).scn file.
Find the line that starts with PRPLEVEL in the "Source" ship, copy it and paste it over the same line in the scenario you created.

If you don't have BTC or don't know how to set the fuel, that's fine. A simple "Please set the 'Source' vessel's fuel for a dv of x m/s" will be enough.

There is no need to do any of this for this scenario, since I've already done it. As a dv budget for the "Source" Deltaglider, I am using 3150 (typical Earth-Moon TLI burn) + 1160 (which you provided in the previous post) = 4310 m/s.

Now a question, Why is your parking orbit like this?
NrT9BE.jpg


Can you walk me through your launch process? Why select this particular date to launch and why this particular parking orbit?
 

Abdullah Radwan

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One last step. Here is where you provide the dv budget for the "Source" ship. If you have BurnTimeCalcMFD installed, run the scenario you created, open BTC and set the fuel of the "Source" ship with the scenario editor.
Also add a few kg of RCS. Exit and open the (Current State).scn file.
Find the line that starts with PRPLEVEL in the "Source" ship, copy it and paste it over the same line in the scenario you created.

If you don't have BTC or don't know how to set the fuel, that's fine. A simple "Please set the 'Source' vessel's fuel for a dv of x m/s" will be enough.

There is no need to do any of this for this scenario, since I've already done it. As a dv budget for the "Source" Deltaglider, I am using 3150 (typical Earth-Moon TLI burn) + 1160 (which you provided in the previous post) = 4310 m/s.

Now a question, Why is your parking orbit like this?
NrT9BE.jpg


Can you walk me through your launch process? Why select this particular date to launch and why this particular parking orbit?

Thanks for posting the way. Sorry for any inconvinience caused.

I attached the wrong scenario :facepalm:. This is in the half of TLI burn. The correct scenario is attached below. The reason of the time is because it's the scheduled time for the airlock module.
 

Attachments

  • Before TLI.scn
    860 bytes · Views: 1

dgatsoulis

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Thanks, much easier and cleaner to work with now. You didn't enter the correct fuel, so I'll use the 4310 m/s posted previously.

The reason that I am asking is this:
LljAP0.jpg


As you can see in the left, the Moon is ~ 90° away from the intercection of the parking orbit an Moon orbit planes. That means that it will get there in ~7 days. A normal (non-free return) trajectory from LEO to the Moon takes about 5 days.

The RInc is small enough, so I can add a bit of plane change in the TLI to push the node closer. Anyway, I'll give it a try some time later and get back here with the results.

---------- Post added at 22:31 ---------- Previous post was at 18:17 ----------

Here is the latest video. The flight was similar to the previous one with a slight difference. I chose the Node as my "waypoint", instead of the periapsis, since it was closer to the target's periapsis. Other than that the mission was pretty much similar to the one before with a slightly higher TLI 'cause of the planes misalignment.

A single burn from LEO got me to less than 7000 km away from the target, with no MCCs on the way there.
Rendezvous occured in 8 days, 20 hours using a total dv of just under 4 km/s.

So the Orion having 1160 m/s after the TLI can definitely get there.

(Video still uploading, will be available in ~30 minutes from the time of this post).


If IMFD's map prediction doesn't seem to be stable in your scenarios, remember that it works better with Nonspherical Gravity switched ON.

:cheers:
 
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