Editing Lunar Reconnaissance Orbiter part 2
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− | === LRO | + | === Mid course correction/LRO === |
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− | + | Switch focus back to LRO. | |
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− | + | Press the '''k''' key to deploy the LRO solar panels | |
− | + | Once the panels have fully unfolded, and rotated to face the sun, | |
− | + | press the '''g''' key to deploy the antenna | |
− | In the | + | In the Left MFD select IMFD, click on MNU and select Map. |
− | + | Make sure TgT is Moon, and click Sel until Ref is Moon. | |
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− | + | Wait until PeT is about 350k<br> | |
+ | Select IMFD in the Right MFD | ||
− | + | Click on '''MNU''', then '''Course'''. Click '''Nxt''' 4 times until ''Delta Velocity'' is highlighted, then click '''Set'''. | |
− | + | Click '''Nxt''' 5 times until ''dVf'' is highlighted, click '''Set''' and enter '''0'''. | |
− | In the | + | Click on '''TgT''' and enter '''Moon'''. |
− | In the | + | In the Left MFD, click '''Pg''', then '''Plan''' so that the green line turns blue. |
− | + | In the right MFD adjust '''dVp''' and '''dVf''' so that ''RIn'' and ''PeA'' in the left MFD are as close as possible to 90 degrees and 216k respectively | |
When these adjustments are finished, click '''PG''','''BV''', then '''AB''' in the right MFD. | When these adjustments are finished, click '''PG''','''BV''', then '''AB''' in the right MFD. | ||
When the burn completes, click '''Plan''' in the left MFD so the blue line returns to green. | When the burn completes, click '''Plan''' in the left MFD so the blue line returns to green. | ||
− | + | Repeat these adjustments as necessary as you get closer to the moon. | |
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=== Course correction/LCROSS === | === Course correction/LCROSS === | ||
− | Switch focus to | + | Switch focus to AV020 Centaur. Select TranxX in both left and right MFDs |
In the right MFD, click '''++''' to turn Maneuvre mode ''On''. | In the right MFD, click '''++''' to turn Maneuvre mode ''On''. | ||
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burn the engine. Reduce the ''Rel V'' to as close to 0 as possible. | burn the engine. Reduce the ''Rel V'' to as close to 0 as possible. | ||
− | As an alternative to using the dummy main engine, after the Centaur is targeted with | + | As an alternative to using the dummy main engine, after the Centaur is targeted with rotational thrusters, you can |
− | + | rotate the Centaur 180 degrees and use the LCROSS main engine '''numpad--''' (minus) This will provide you with graphics | |
− | + | of the engine firing in external view. ('''F1''') | |
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Repeat these adjustments as necessary as you get closer to the moon. | Repeat these adjustments as necessary as you get closer to the moon. | ||
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The LRO main engine is not strong enough to get it into a circular orbit in one try. It will take 4 burns over 12 orbits to achieve the initial 216km x 30km commissioning orbit, with periselene over the South Pole. The first burn is critical in that we must avoid a situation where we are "weakly captured" or not captured at all. The orbit eccentricity at the end of our first burn must be 0.8 or less. | The LRO main engine is not strong enough to get it into a circular orbit in one try. It will take 4 burns over 12 orbits to achieve the initial 216km x 30km commissioning orbit, with periselene over the South Pole. The first burn is critical in that we must avoid a situation where we are "weakly captured" or not captured at all. The orbit eccentricity at the end of our first burn must be 0.8 or less. | ||
− | When LRO's PeT is about | + | When LRO's PeT is about 10k, select IMFD in the left MFD, and Orbit MFD in the right. |
− | Click on the '''HUD''' button on the right MFD. | + | Click on the '''HUD''' button on the right MFD. In the left MFD click '''MNU''', then '''Orbital'''. |
− | + | Click '''TgT''', then type '''r'''. | |
− | Click ''' | + | Note that The burn time to a circular orbit is over 4k seconds (over an hour!). Make sure rotational mode is selected. |
− | + | At 2k seconds to PeT, select Retrograde mode on the hud. When retrograde attitude is established, de-select retrograde mode. | |
− | + | Start the engine by pressing '''numpad-+''' and tap the '''CTRL''' key to keep it burning. | |
− | + | Notice that the PeA in the right MFD is decreasing. | |
− | + | Use the numpad '''1''' and '''3''' keys to move the attitude closer to what the Orbital IMFD mode thinks it should be until | |
− | + | the PeA starts increasing. | |
− | + | Keep adjusting the attitude between these points to keep the PeA as close as possible to 216km. | |
− | + | When the ApA. parameter in the Right MFD is 3160km, press the '''numpad-*''' key to stop the burn. | |
− | + | The LRO then completes 4 orbits at 3160km x 216km before the next burn, | |
− | + | you can switch focus to AV020Centaur and enjoy the view as it passes by the moon. | |
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− | you can switch focus to AV020Centaur and enjoy the view as it passes by the moon. | ||
− | After the flyby, switch back to LRO and after 4 orbits, wait until | + | After the flyby, switch back to LRO and after 4 orbits, wait until PeT |
− | is | + | is 800k. Press the retrograde button, and de-select it when retrograde attitude is achieved. |
Follow the procedure above to make the second burn, | Follow the procedure above to make the second burn, | ||
− | + | keeping PeA as close as possible to 216km, and burn until ApA is 967km. | |
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After another 5 complete orbits at 216km x 967km, make a third burn to circularize your orbit at 216km. | After another 5 complete orbits at 216km x 967km, make a third burn to circularize your orbit at 216km. | ||
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Make a final burn on your next pass over the North Pole to reduce your PeA to 30km near the South Pole. | Make a final burn on your next pass over the North Pole to reduce your PeA to 30km near the South Pole. | ||
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changes significantly due to time acceleration, fix it with scenario editor. It is now necessary to tune IMFD map for maximum accuracy. | changes significantly due to time acceleration, fix it with scenario editor. It is now necessary to tune IMFD map for maximum accuracy. | ||
Select IMFD in the left MFD. Click '''MNU''', then '''Map'''. Click '''TgT''' and type '''Moon''', Click '''Cnt''', and type '''Earth'''. | Select IMFD in the left MFD. Click '''MNU''', then '''Map'''. Click '''TgT''' and type '''Moon''', Click '''Cnt''', and type '''Earth'''. | ||
− | Click '''MOD''' 3 times. This should give you the Map-config screen. ''Legs/Frame'' should be highlighted. | + | Click '''MOD''' 3 times. This should give you the Map-config screen. ''Legs/Frame'' should be highlighted. Click '''Set''' and type '''64'''. |
− | + | Click '''Nxt''', then '''-''' twice. Click '''Nxt twice again, so that ''Period limit'' is highlighted, and click '''+''' to turn it off. | |
− | Click '''Nxt''', then '''-''' twice. Click '''Nxt twice again, so that ''Period limit'' is highlighted, and | + | Click '''Nxt''' and '''+''' to turn ''Hyper limit'' off. Click '''Nxt''' twice and then '''+''' so that ''Tgt weak Pe'' is set to No. |
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− | Click '''Nxt''' and '''+''' to turn ''Hyper limit'' off. Click '''Nxt''' twice and then '''+''' so that | ||
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Click '''Nxt''' and '''+''' to turn ''One Pe/Ref'' off. Click '''Mod''' again to return to the map display. | Click '''Nxt''' and '''+''' to turn ''One Pe/Ref'' off. Click '''Mod''' again to return to the map display. | ||
Several orbits should now be shown. Select IMFD in the Right MFD. | Several orbits should now be shown. Select IMFD in the Right MFD. | ||
− | In the right MFD click '''MNU''', then '''Course'''. Select ''Delta Velocity'' mode, then set the target to Moon. | + | In the right MFD click '''MNU''', then '''Course'''. Select ''Delta Velocity'' mode, then set the target to Moon. Set the ''dVf'' parameter to 0. |
− | + | In the left MFD click '''PG''', then '''Plan'''. in the right MFD, adjust '''dVf''' to get the most deflection of the orbit you can when | |
− | In the left MFD click '''PG''', then '''Plan'''. in the right MFD, adjust '''dVf''' to get the most deflection | + | LCROSS intersects the moon in 1.5 orbits. When this is done, click on '''Pg''', then '''BV''', then '''AB'''. |
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When the burn is finished, click '''Plan''' in the left MFD to turn the orbit line green again. | When the burn is finished, click '''Plan''' in the left MFD to turn the orbit line green again. | ||
==== Alternate procedure ==== | ==== Alternate procedure ==== | ||
Select transx in the right MFD. | Select transx in the right MFD. | ||
− | In the right MFD, select target moon and 1.5 orbits to intercept. | + | In the right MFD, select target moon and 1.5 orbits to intercept. Change the view to Maneuver, and select Maneuver mode. |
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Adjust '''prograde vel''', and '''Ch. Pl vel''' for the minimum closest approach. | Adjust '''prograde vel''', and '''Ch. Pl vel''' for the minimum closest approach. | ||
Select target view and use rotational mode to align the cross with the target. | Select target view and use rotational mode to align the cross with the target. | ||
− | Start the burn and watch the orbit in Map MFD mode in the left MFD. When maximum | + | Start the burn and watch the orbit in Map MFD mode in the left MFD. When maximum orbit deflection is reached at the moon intercept point |
− | + | after 1.5 orbits, stop the burn. | |
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=== LCROSS final moon targeting === | === LCROSS final moon targeting === | ||
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and IMFD course in the right MFD. | and IMFD course in the right MFD. | ||
In the right MFD set ''target intercept'' mode. Set target to '''Moon'''. | In the right MFD set ''target intercept'' mode. Set target to '''Moon'''. | ||
− | Adjust the TIn MJD and then TIn parameters for minimum Enroute dV. | + | Adjust the TIn MJD and then TIn parameters for minimum Enroute dV. Change ''Target intercept'' mode to ''Delta Velocity'' mode. |
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Click '''Nxt''' 4 times to highlight ''Get Burn'', and click '''+'''. | Click '''Nxt''' 4 times to highlight ''Get Burn'', and click '''+'''. | ||
− | In the left MFD click '''Sel''' until ref is ''Moon'' and ''PeA'' is the lowest value. | + | In the left MFD click '''Sel''' until ref is ''Moon'' and ''PeA'' is the lowest value. Click '''Pg''', then '''Plan'''. |
− | + | In the right MFD adjust the highest value of ''dVf'', ''dVp'', or ''dVo'' to minimise ''PeA'' in the left MFD. | |
− | In the right MFD adjust the highest value of ''dVf'', ''dVp'', or ''dVo'' to | + | As the orbit changes, the PeA number may change, so you may have to return to the proper one with the '''Sel''' button once in a while |
− | + | Adjust the next highest value of ''dVf'', ''dVp'', or ''dVo'', and finally adjust remaining value. | |
− | As the orbit changes, the PeA number may change, so you may have to return to the | ||
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− | Adjust the next highest value of ''dVf'', ''dVp'', or ''dVo'', and finally adjust | ||
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When these adjustments are done, click '''Pg''', '''BV''', and '''AB'''. | When these adjustments are done, click '''Pg''', '''BV''', and '''AB'''. | ||
Note the PeT in the left MFD. We need to make another burn when we are halfway from here to the noon so that we will impact the moon. | Note the PeT in the left MFD. We need to make another burn when we are halfway from here to the noon so that we will impact the moon. | ||
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=== LRO Orbit Circularization === | === LRO Orbit Circularization === | ||
60 days after your last LRO orbit insertion burn, | 60 days after your last LRO orbit insertion burn, | ||
− | switch focus to LRO, and at Perilune over the south pole, burn retrograde until the ApA is | + | switch focus to LRO, and at Perilune over the south pole, burn retrograde until the ApA is 50km. |
− | === LCROSS Lunar pole | + | === LCROSS Lunar pole targetinjg === |
Switch focus back to AV020Centaur. When the PeT is 130k Set IMFD map in the left MFD and IMFD Base approach in the right MFD. | Switch focus back to AV020Centaur. When the PeT is 130k Set IMFD map in the left MFD and IMFD Base approach in the right MFD. | ||
In the left MFD set target Moon and center to Self ('''x''') | In the left MFD set target Moon and center to Self ('''x''') | ||
Click on '''Sel''' until ''Ref Moon'' is displayed with a negative PeA. | Click on '''Sel''' until ''Ref Moon'' is displayed with a negative PeA. | ||
In the right MFD click '''REF''', and type '''Moon'''. | In the right MFD click '''REF''', and type '''Moon'''. | ||
− | Click '''Nxt''' until ''Hint'' is highlighted. Click '''Set''' and type the value shown for '' | + | Click '''Nxt''' until ''Hint'' is highlighted. Click '''Set''' and type the value shown for ''PeA'' in the left MFD. |
− | Click '''Prv''' until ''Lat'' is highlighted. Click '''Set''' and type '''89.9''' | + | Click '''Prv''' until ''Lat'' is highlighted. Click '''Set''' and type '''-89.9''' |
− | Click '''Nxt''', then '''Set''' and set the ''Alt'' to '''0'''. | + | Click '''Nxt''', then '''Set''' and set the ''Alt''' to '''0'''. |
− | Click '''Nxt''', then '''Set''' and set the ''ReA'' (Re-enty Angle) to ''' | + | Click '''Nxt''', then '''Set''' and set the ''ReA'' (Re-enty Angle) to '''75''' |
Click '''Nxt''', then '''Set''' and set the ''Ant'' parameter to '''0''' | Click '''Nxt''', then '''Set''' and set the ''Ant'' parameter to '''0''' | ||
You may need to reset the ''Hint'' Parameter at this time to the current PeT. | You may need to reset the ''Hint'' Parameter at this time to the current PeT. | ||
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=== LCROSS LRO targeting === | === LCROSS LRO targeting === | ||
+ | * ~7 hours prior to impact, LCROSS will separate from Centaur upper stage and perform a ~4-minute delay maneuver (~23 m/s) to enable LCROSS to fly through Centaur impact plume | ||
In the left MFD, click '''REF''' and type '''Moon''', then click '''TGT''' and type '''LRO''' | In the left MFD, click '''REF''' and type '''Moon''', then click '''TGT''' and type '''LRO''' | ||
Click '''PRJ''' until ''Target'' is displayed in the lower left corner. | Click '''PRJ''' until ''Target'' is displayed in the lower left corner. | ||
− | Click '''Z-''' until you can see the white dot that represents the current vessel. Remember | + | Click '''Z-''' until you can see the white dot that represents the current vessel. Remember where this "incoming" leg of the orbit is located. |
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In the right MFD click '''MNU''', then '''Course'''. Highlight ''Target Intercept'', then click '''Set'''. | In the right MFD click '''MNU''', then '''Course'''. Highlight ''Target Intercept'', then click '''Set'''. | ||
Click '''TGT''', and type '''LRO'''. Click '''PRJ''' until ''LRO'' is shown in the lower left corner of the MFD. | Click '''TGT''', and type '''LRO'''. Click '''PRJ''' until ''LRO'' is shown in the lower left corner of the MFD. | ||
The orientation of the two MFD's should now be exacly alike with repect to the position of the LCROSS and LRO orbits. We want to adjust the time of intercept of the LRO orbit so that it is 4 minutes (240 seconds) before LRO passes by. | The orientation of the two MFD's should now be exacly alike with repect to the position of the LCROSS and LRO orbits. We want to adjust the time of intercept of the LRO orbit so that it is 4 minutes (240 seconds) before LRO passes by. | ||
In the right MFD click '''Nxt''' until the ''Tin'' parameter is highlighted. | In the right MFD click '''Nxt''' until the ''Tin'' parameter is highlighted. | ||
− | Click '''+''' or '''-''' until the white intercept point line intersects the point where | + | Click '''+''' or '''-''' until the white intercept point line intersects the point where the incoming side of the LCROSS orbit intersects the LRO's orbit. |
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Whether you use + or - depends on which has the least dV at the intersect point. | Whether you use + or - depends on which has the least dV at the intersect point. | ||
Click '''PG''', then '''BV''', then '''AB'''. | Click '''PG''', then '''BV''', then '''AB'''. | ||
Once this burn is done we must turn prograde with respect to the orbit of the moon and burn an additional 5 m/s. | Once this burn is done we must turn prograde with respect to the orbit of the moon and burn an additional 5 m/s. | ||
− | Make sure the HUD reference is ''ORBIT [Moon]''. Use rotational thrusters to align | + | Make sure the HUD reference is ''ORBIT [Moon]''. Use rotational thrusters to align in the prograde direction. |
− | + | Do not use the prograde autopilot, as we are not in the moons SOI yet. In the right MFD note the Tot line in the dV applied section. | |
− | Do not use the prograde autopilot, as we are not in the moons SOI yet. | ||
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Add 5 to this number and burn until the ''Tot dV'' applied equals this number. | Add 5 to this number and burn until the ''Tot dV'' applied equals this number. | ||
When this burn is complete, in the right MFD click '''MNU''', then '''Base Approach'''. | When this burn is complete, in the right MFD click '''MNU''', then '''Base Approach'''. | ||
− | Highlight ''Hint'' and set it to the current ''Pet'' in the left MFD. | + | Highlight ''Hint'' and set it to the current ''Pet'' in the left MFD. Click '''Prv''' twice to highlight ''ReA''. |
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Click '''+''' or '''-''' to minimize Enroute dV. Click '''Pg''', '''BV''', and '''AB'''. | Click '''+''' or '''-''' to minimize Enroute dV. Click '''Pg''', '''BV''', and '''AB'''. | ||
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=== LCROSS Separation === | === LCROSS Separation === | ||
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Wait until Pet in the Left MFD is 25k. | Wait until Pet in the Left MFD is 25k. | ||
− | In the | + | In the left MFD, minimize ''dV'' by adjusting ''ReA'', and make the burn. |
Jettison LCROSS by pressing '''k''' | Jettison LCROSS by pressing '''k''' | ||
Once LCROSS is jettisoned, switch focus to the LCROSS spacecraft. | Once LCROSS is jettisoned, switch focus to the LCROSS spacecraft. | ||
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Make sure ''Target Intercept'' is highlighted, and click '''Set'''. Click '''TGT''' and type '''LRO'''. | Make sure ''Target Intercept'' is highlighted, and click '''Set'''. Click '''TGT''' and type '''LRO'''. | ||
Click '''PRJ''' until the lower left corner says ''LRO''. Click '''Nxt''' 3 times so that ''Tin'' is highlighted. | Click '''PRJ''' until the lower left corner says ''LRO''. Click '''Nxt''' 3 times so that ''Tin'' is highlighted. | ||
− | Click '''-''' until the white intercept line intersects the point where our incoming orbit | + | Click '''-''' until the white intercept line intersects the point where our incoming orbit intersects the LRO orbit. |
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Click '''PG''', than '''BV''', then '''AB'''. | Click '''PG''', than '''BV''', then '''AB'''. | ||
This should result in a mostly retrograde burn of about 23 m/s. When this burn is complete: | This should result in a mostly retrograde burn of about 23 m/s. When this burn is complete: | ||
− | In the right MFD select '''MNU''', then '''Base Approach | + | In the right MFD select '''MNU''', then '''Base Approach'''. |
− | + | * current strategy | |
− | + | ** target LRO | |
− | + | ** boost additional 5m/s prograde | |
− | + | ** retarget base approach | |
− | + | ** separation at 25k PeT | |
− | + | ** LCROSS target LRO intersection | |
− | + | ** LCROSS target base approach | |
− | + | ** rinse, repeat | |
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== External reference documents == | == External reference documents == | ||
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[http://lunar.gsfc.nasa.gov/library/IAC-07-C1_7_06.pdf Mission Design And Operations Considerations For NASA’S LRO]<br> | [http://lunar.gsfc.nasa.gov/library/IAC-07-C1_7_06.pdf Mission Design And Operations Considerations For NASA’S LRO]<br> | ||
[http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070021535_2007013516.pdf Mission Design for the Lunar Reconnaissance Orbiter]<br> | [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070021535_2007013516.pdf Mission Design for the Lunar Reconnaissance Orbiter]<br> | ||
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− | + | == TODO == | |
− | + | *Fix procedure for actual mission parameters | |
− | + | ** updated Launch date? - currently: 2nd March 2009 05:26:27 | |
− | + | ** LCROSS North pole impact | |
− | + | *** Target a specific crater | |
+ | ** Try IMFD slingshot mode to refine flyby once in lunar SOI | ||
+ | * Add keyboard commands section | ||
+ | * Convert to .CHM for help mode within orbiter | ||
+ | * Add images | ||
+ | ** IMFD map periapsis projection to show LCROSS orbit inclination |