Editing Lunar Reconnaissance Orbiter (BrianJ add-on)
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== Overview == | == Overview == | ||
− | The Lunar Reconnaissance Orbiter (LRO) is the first mission in NASA's planned return to the moon. LRO | + | The Lunar Reconnaissance Orbiter (LRO) is the first mission in NASA's planned return to the moon. LRO will launch 2nd March, 2009, with the objectives to finding safe landing sites, locate potential resources, characterize the radiation environment and test new technology. |
The return to the moon will enable the pursuit of scientific activities that address our fundamental questions about the history of Earth, the solar system and the universe -- and about our place in them. It will allow us to test technologies, systems, flight operation and exploration techniques to reduce the risk and increase the productivity of future missions to Mars and beyond. It will also expand Earth's economic sphere to conduct lunar activities with benefits to life on our home planet. | The return to the moon will enable the pursuit of scientific activities that address our fundamental questions about the history of Earth, the solar system and the universe -- and about our place in them. It will allow us to test technologies, systems, flight operation and exploration techniques to reduce the risk and increase the productivity of future missions to Mars and beyond. It will also expand Earth's economic sphere to conduct lunar activities with benefits to life on our home planet. | ||
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Earth’s closest neighbor is holding a secret. In 1999, hints of that secret were revealed in the form of concentrated hydrogen signatures detected in permanently shadowed craters at the lunar poles by NASA’s Lunar Prospector. These readings may be an indication of lunar water and could have far-reaching implications as humans expand exploration past low-Earth orbit. The Lunar CRater Observing and Sensing Satellite (LCROSS) mission is seeking a definitive answer. | Earth’s closest neighbor is holding a secret. In 1999, hints of that secret were revealed in the form of concentrated hydrogen signatures detected in permanently shadowed craters at the lunar poles by NASA’s Lunar Prospector. These readings may be an indication of lunar water and could have far-reaching implications as humans expand exploration past low-Earth orbit. The Lunar CRater Observing and Sensing Satellite (LCROSS) mission is seeking a definitive answer. | ||
− | === | + | === required add-ons === |
− | * [http:// | + | * [http://orbithangar.com/searchid.php?ID=2601 Atlas V heavy] V2 by Kev33 |
− | * [http:// | + | * [http://koti.mbnet.fi/jarmonik/Orbiter.html IMFD 5.1m] |
− | === | + | === optional add-ons === |
* [http://orbithangar.com/searchid.php?ID=3165 Attitude MFD] | * [http://orbithangar.com/searchid.php?ID=3165 Attitude MFD] | ||
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== Spacecraft Specifications == | == Spacecraft Specifications == | ||
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== Spacecraft Controls == | == Spacecraft Controls == | ||
− | Available | + | Available Commands are displayed on the top-left of the vessel HUD |
'''AV020Centaur''' | '''AV020Centaur''' | ||
− | + | <nowiki>P = Toggle Parking Orbit Autopilot On/Off | |
− | + | J = Jettison LRO | |
− | + | B = Manual Purge Centaur Fuel (automatic at 32000km alt.) | |
− | + | K = Jettison LCROSS | |
− | + | V = Deploy/Delete LCROSS "Bullseye" target on Moon N.Pole | |
− | + | N = Display LRO Lunar Orbit Data | |
− | + | M = TransX cheat! Enable 25N "ghost" main engine for use with TransX</nowiki> | |
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'''LRO''' | '''LRO''' | ||
− | + | G = Deploy Antenna | |
− | + | K = Deploy Solar Panel | |
− | + | N = Activate Laser Altimeter | |
− | + | V/Shift+V = Rotate DLRE Azimuth | |
− | + | B/Shift+B = Rotate DLRE Elevation | |
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'''LCROSS''' | '''LCROSS''' | ||
− | + | F8 = View from Visual Context Imager (6 deg FOV) | |
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== Procedures == | == Procedures == | ||
Accuracy of burns in this mission is '''CRITICAL'''. | Accuracy of burns in this mission is '''CRITICAL'''. | ||
+ | During this mission, especially after the TLI burn, we will be using the tools TransX or IMFD to get the '''DIRECTION''' of our burns, and using IMFD map to monitor in real time the '''MAGNITUDE''' of the DeltaV we are imparting. For this mission, usually the AUTOBURN button is '''NOT''' your friend. | ||
+ | The precession of the Moon's axis is not modelled in Orbiter. | ||
+ | You may wish to edit your config/Moon.cfg file and change the LAN and SidRotOffset lines to | ||
+ | SidRotOffset = -4.52701 | ||
+ | LAN = 5.2775 | ||
+ | This will ensure a more accurate orientation of the Moon for the LRO | ||
+ | simulation. | ||
=== Launch === | === Launch === | ||
− | Fire up the '''01 - AV020 LRO launch | + | Fire up the '''01 - AV020 LRO launch''' scenario in the LRO scenarios folder |
This is a night launch so visibility is poor until after the TLI burn. | This is a night launch so visibility is poor until after the TLI burn. | ||
− | The scenario starts at UTC | + | The scenario starts at UTC 03/02/2009 05:25:00. |
− | Launch time is UTC | + | Launch time is UTC 05:26:27. |
The default camera view is Ground Observer. You have just over a minute to set up the camera to your personal preference. | The default camera view is Ground Observer. You have just over a minute to set up the camera to your personal preference. | ||
− | At UTC | + | At UTC 05:26:17 press the '''p''' key to start the launch countdown and |
1st stage auto-pilot. | 1st stage auto-pilot. | ||
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Click '''Set''' | Click '''Set''' | ||
Click '''Tgt''' and enter '''Moon''' | Click '''Tgt''' and enter '''Moon''' | ||
− | Click '''Nxt''' | + | Click '''Nxt''' 5 times so that ''Realtime'' is highlighted. |
− | + | Click '''+''' to change it to ''Off-Axis''. | |
− | + | Click '''Nxt''' until the ''Tej'' parameter is highlighbted. | |
− | Click '''+''' to change it to ''Off-Axis'' | + | Click '''+''' or '''-''' repeately until the ''dV'' parameter reaches a minimum. This should be about ''3.59k'' |
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− | Click ''' | ||
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− | Click '''+''' or '''-''' | ||
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Select IMFD in the right MFD also. | Select IMFD in the right MFD also. | ||
Click '''MNU''', then '''PG'''. Enter '''0''' for the ''MFD ID''. Click '''Map'''. | Click '''MNU''', then '''PG'''. Enter '''0''' for the ''MFD ID''. Click '''Map'''. | ||
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Click '''MOD''' 3 times, then click '''Nxt''' so that ''Accuracy'' is highlighted. | Click '''MOD''' 3 times, then click '''Nxt''' so that ''Accuracy'' is highlighted. | ||
Click '''-''' twice so that ''accuracy'' is set to ''Max''. | Click '''-''' twice so that ''accuracy'' is set to ''Max''. | ||
− | Click '''MOD''' | + | Click '''MOD''' to return to the map display. |
− | Wait until the ''TEj'' parameter in the left display is ''1k'' | + | Wait until the ''TEj'' parameter in the left display is ''1k'' |
In the left MFD, Click '''MOD''', and ''Offset Disabled'' should be highlighted. | In the left MFD, Click '''MOD''', and ''Offset Disabled'' should be highlighted. | ||
Click '''+''' twice and ''Vel. Frame'' should be displayed. Click '''Nxt''' until ''Lon'' is highlighted. | Click '''+''' twice and ''Vel. Frame'' should be displayed. Click '''Nxt''' until ''Lon'' is highlighted. | ||
− | Click '''Set''' and enter ''' | + | Click '''Set''' and enter '''100'''. Click '''Nxt''' and ''Lat'' should be highlighted. |
− | Click '''Set''' and enter ''' | + | Click '''Set''' and enter '''35.9'''. Click '''Nxt''', then '''Set''', and enter '''7.28M''' for ''Rad''. |
− | Adjust the ''Rad'' and ''Lat'' parameters to get the ''PeA'' and '' | + | Adjust the ''Rad'' and ''Lat'' parameters to get the ''PeA'' and ''Rin'' parameters in the right MFD as close |
− | as possible to '' | + | as possible to ''216k'' and ''90'' degrees. Repeat as necessary. Click '''Pg''', then '''BV''', then '''AB'''. |
Disengage the ''Prograde'' autopilot. | Disengage the ''Prograde'' autopilot. | ||
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=== Lunar targeting/LCROSS === | === Lunar targeting/LCROSS === | ||
* Swingby of moon is passive (no thrusting) | * Swingby of moon is passive (no thrusting) | ||
− | * | + | * 81 days in post-swingby cruise orbit |
− | * Current baseline is | + | * Current baseline is 3-month trajectory with south pole impact |
− | * Two revolutions in high ecliptic inclination (~50 deg), | + | * Two revolutions in high ecliptic inclination (~50 deg), 40-day period Earth orbit |
When you reach 32M altitude above the Earth, the Centaur engine will automatically purge of all fuel and control switches over to the LCROSS propulsion system. You may initate the engine purge manually by pressing '''B'''. It is '''critical''' that you get your targeting done for LCROSS before this time, as once that happens, your deltaV budget is severely limited. | When you reach 32M altitude above the Earth, the Centaur engine will automatically purge of all fuel and control switches over to the LCROSS propulsion system. You may initate the engine purge manually by pressing '''B'''. It is '''critical''' that you get your targeting done for LCROSS before this time, as once that happens, your deltaV budget is severely limited. | ||
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Click '''+''', then '''Nxt''' four times until ''Delta Velocity'' is highlighted. | Click '''+''', then '''Nxt''' four times until ''Delta Velocity'' is highlighted. | ||
Click '''Set'''. Click '''TGT''', and type '''Moon'''. | Click '''Set'''. Click '''TGT''', and type '''Moon'''. | ||
− | Click '''Nxt''' | + | Click '''Nxt''' four times until ''dVf'' is highlighted. |
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Click '''Set''', and enter '''0'''. | Click '''Set''', and enter '''0'''. | ||
in the Right MFD, click '''Plan''' so the green course line turns blue. | in the Right MFD, click '''Plan''' so the green course line turns blue. | ||
In the left MFD, adjust ''dVp'' and ''dVf'' so that ''RIn'' and ''PeA'' in the right MFD | In the left MFD, adjust ''dVp'' and ''dVf'' so that ''RIn'' and ''PeA'' in the right MFD | ||
− | are as close as possible to ''90'' degrees, and '' | + | are as close as possible to ''90'' degrees, and ''2.0M'', respectively. |
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Click '''PG''', '''BV''', and '''AB'''. | Click '''PG''', '''BV''', and '''AB'''. | ||
When the burn is finished, click '''BV''', and '''PG''' in the left MFD, and '''Plan''' in the right MFD. | When the burn is finished, click '''BV''', and '''PG''' in the left MFD, and '''Plan''' in the right MFD. | ||
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There will be a green line extending from the center of the moon to hopefully past the edge. This is an edge-on view of our current approach to the moon. | There will be a green line extending from the center of the moon to hopefully past the edge. This is an edge-on view of our current approach to the moon. | ||
− | We need to fine tune this approach to give us a lunar gravity assist which will result in a highly inclined orbit around the earth with a period of | + | We need to fine tune this approach to give us a lunar gravity assist which will result in a highly inclined orbit around the earth with a period of 40 days |
On the Right MFD, click the '''VAR''' button twice to bring up the ''Inc. angle'' parameter | On the Right MFD, click the '''VAR''' button twice to bring up the ''Inc. angle'' parameter | ||
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on the solid green line in the slingshot view. | on the solid green line in the slingshot view. | ||
− | This is our current trajectory. Now we need to adjust the trajectory to impact the moon in 2 orbits with a | + | This is our current trajectory. Now we need to adjust the trajectory to impact the moon in 2 orbits with a 40 day period. |
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On the Right MFD, click '''VW''' so that the setup view is shown | On the Right MFD, click '''VW''' so that the setup view is shown | ||
Click '''VAR''' 3 times so that ''Orbits to Icept'' is shown | Click '''VAR''' 3 times so that ''Orbits to Icept'' is shown | ||
Click '''++''' 4 times so that the ''Orbits to Icept'' parameter is 2.0 | Click '''++''' 4 times so that the ''Orbits to Icept'' parameter is 2.0 | ||
− | Now we must figure out what our ''Enc. MJD'' should be. Take the current MJD and add | + | Now we must figure out what our ''Enc. MJD'' should be. Take the current MJD and add 85 to it. (5 days to reach the moon, then 2 orbits of 40 days each.) For the Mar 2 (UTC) launch this would be 54892 + 85 = 54977. This is the ''Enc. MJD'' we will be shooting for. |
Click '''VW''' again in the right MFD to get back to ''sling direct'' view. | Click '''VW''' again in the right MFD to get back to ''sling direct'' view. | ||
Adjust the Inc Angle to get as close as possible to the desired MJD. | Adjust the Inc Angle to get as close as possible to the desired MJD. | ||
− | + | Click '''VAR''' so that ''Outward angle'' is displayed. | |
− | + | Click '''ADJ''' twice so that the increment is ''Fine'' | |
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− | Click '''ADJ''' so that the increment is ''Fine'' | ||
Adjust ''Outward angle'' to get the Cl. App. as close as possible. | Adjust ''Outward angle'' to get the Cl. App. as close as possible. | ||
− | My current solution is Inc Angle of | + | My current solution is Inc Angle of 114.44 degrees and Outward angle of -43.172. Enc MJD is 54979.28, and Cl. App is 6.352M<br> |
Your Mileage may vary. | Your Mileage may vary. | ||
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Once a solution has been reached, click '''BCK''' twice on the Right MFD. | Once a solution has been reached, click '''BCK''' twice on the Right MFD. | ||
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closer to the moon. | closer to the moon. | ||
− | == | + | == [[LRO_part_2]] == |
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