Editing Lunar Reconnaissance Orbiter part 2
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Click '''Sel''' until ''Ref Moon'' is displayed in yellow letters. | Click '''Sel''' until ''Ref Moon'' is displayed in yellow letters. | ||
Click '''MOD''' 3 times and set ''Accuracy'' to ''Max''. | Click '''MOD''' 3 times and set ''Accuracy'' to ''Max''. | ||
− | Click '''MOD''' | + | Click '''MOD''' again to restore Map view. |
In the left MFD, click '''MNU''', then '''Course'''. | In the left MFD, click '''MNU''', then '''Course'''. | ||
Click '''Nxt''' 4 times so that ''Delta Velocity'' is highlighted, and click '''Set'''. | Click '''Nxt''' 4 times so that ''Delta Velocity'' is highlighted, and click '''Set'''. | ||
Click '''TGT''', and enter '''Moon'''. | Click '''TGT''', and enter '''Moon'''. | ||
− | Click '''Nxt''' | + | Click '''Nxt''' 5 times so that ''dVf'' is highlighted, click '''Set''', and enter '''0'''. |
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In the right MFD click '''PG''', then '''Plan'''. | In the right MFD click '''PG''', then '''Plan'''. | ||
− | In the left MFD, adjust '''dVf''', and '''dVp''' so that '' | + | In the left MFD, adjust '''dVf''', and '''dVp''' 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 ''216k'' as possible. |
Be as accurate as possible here. LRO is planning on avoiding a mid-course correction if possible. In orbiter, we will probably still have to do a small | Be as accurate as possible here. LRO is planning on avoiding a mid-course correction if possible. In orbiter, we will probably still have to do a small | ||
MCC. | MCC. | ||
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=== Mid course correction/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 | ||
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+ | In the Left MFD select IMFD, click on '''MNU''' and select '''Map'''. | ||
+ | Make sure '''TgT''' is '''Moon''', and click '''Sel''' until ''Ref'' is ''Moon''. | ||
Wait until ''PeT'' is about ''350k''<br> | Wait until ''PeT'' is about ''350k''<br> | ||
− | + | Select IMFD in the Right MFD | |
− | In the | + | |
− | In the | + | Click on '''MNU''', then '''Course'''. Click '''Nxt''' 4 times until ''Delta Velocity'' is highlighted, then click '''Set'''. |
− | to 90 degrees and | + | Click '''Nxt''' 5 times until ''dVf'' is highlighted, click '''Set''' and enter '''0'''. |
+ | Click on '''TgT''' and enter '''Moon'''. | ||
+ | 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. | ||
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[[Image:Lromid.jpg]] After mid course correction | [[Image:Lromid.jpg]] After mid course correction | ||
− | + | Repeat these adjustments as necessary as you get closer to the moon. | |
=== Course correction/LCROSS === | === Course correction/LCROSS === | ||
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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. | |
− | until the | + | 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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=== 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. | ||
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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 right MFD, minimize ''dV'' by adjusting ''ReA'', and make the burn. | In the right MFD, minimize ''dV'' by adjusting ''ReA'', and make the burn. | ||
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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 |