Mro On Approach, TCM-3 not required |
Mro On Approach, TCM-3 not required |
Feb 3 2006, 11:06 PM
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#101
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Member Group: Members Posts: 134 Joined: 13-March 05 Member No.: 191 |
MRO has shifted from the cruise phase to Approach phase. Apparently, the trajectory is so good that TCM-3 was cancelled. This is good news for the prospects for a long life for MRO supporting future missions. TCM-4 is on Feb 28, and MOI on March 10. Only 5 weeks away!
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Mar 2 2006, 07:13 PM
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#102
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Member Group: Members Posts: 178 Joined: 13-September 05 Member No.: 498 |
Has anyone heard or found any information on the TCM scheduled for 28 Feb?
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Mar 2 2006, 09:57 PM
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#103
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
Has anyone heard or found any information on the TCM scheduled for 28 Feb? "The third trajectory correction maneuver was deemed unnecessary due to the precision of the spacecraft's current path." http://mars.jpl.nasa.gov/mro/mission/orbiter_update.html |
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Mar 2 2006, 10:21 PM
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#104
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
The Feb 29th manouver would have been TCM 4, that statement is refering to the half-way-point-ish manouver a few months ago.
Doug |
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Mar 3 2006, 02:52 PM
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#105
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
The Feb 29th manouver would have been TCM 4, that statement is refering to the half-way-point-ish manouver a few months ago. Doug http://mars.jpl.nasa.gov/mro/mission/tl_approach_tcm.html QUOTE TCM-4: During the final approach to Mars, the orbiter will perform the last trajectory correction maneuver that will target the orbiter to its final aim point for Mars orbit insertion on a southern approach trajectory toward Mars. TCM-4 will be used to remove any errors from the previous trajectory correction maneuvers (TCM-1, TCM-2, and TCM-3) during cruise. It will target the final aim point for Mars orbit insertion and will occur about 10 days prior to that event. TCM-5: This maneuver will serve a different purpose than the other TCMs. It is essentially an insurance policy for the orbiter. In case the trajectory is coming too close to Mars when it arrives, TCM-5 will be used to increase the altitude to what is needed for the Mars orbit insertion burn. The TCM-5 orbiter commands will be stored on-board the orbiter days before they are needed. The orbiter will have two burn opportunities - at 24 hours and at 12 hours before the MOI burn. During the last day before arrival, navigators will know if the orbiter coming too close. Mission managers can then choose to perform TCM-5. If the orbiter arrives at Mars on the expected trajectory, TCM-5 will never be needed. Nothing yet...I suppose they are rather busy at JPL at the moment... |
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