LADEE on 10-1-2013 07:13 UTC (Rotating Coordinate Frame)
LADEE on 10-1-2013 07:13 UTC (Earth Inertial Coordinate Frame)
LADEE on 10-1-2013 07:13 UTC (Top View)
LADEE now under the GEO belt, and heading for its last perigee.
LADEE on 9-30-2013 18:56 UTC (Rotating Coordinate Frame)
LADEE on 9-30-2013 18:56 UTC (Earth-Centered Inertial Coordinate Frame)
LADEE on 9-30-2013 18:56 UTC (Top View)
Next Maneuver: TCM-1 on 1 Oct. 2013 22:00:00 UTC (11 hrs after Perigee 3).
LADEE on 9-29-2013 16:05 UTC (Rotating Coordinate Frame)
LADEE on 9-29-2013 16:05 UTC (Earth-Centered Inertial Frame)
LADEE on 9-29-2013 16:05 UTC (Top View)
On Sep. 28 2013 05:33 UTC, LADEE is coming out of its last apogee and at an altitude of 214,000 km.
LADEE on 9-28-2013 5:46 UTC
LADEE on 9-28-2013 5:46 UTC (Top View)
Perigee occurs on 1 Oct near 11:00 UTC. A final small midcourse maneuver will take place at 1 Oct 2013, 22:00 UTC. This 0.9 m/sec maneuver will precisely target insertion parameters for the 6 Oct. 2013 10:57 UTC LOI-1 maneuver. LOI-1 is designed to place the spacecraft into a 24 hr orbit, with a periselene altitude of 590 km [correction: previously I said 750 km, this isn’t quite right. For LADEE we aren’t capturing right at periselene, like orbital mechanics would recommend. Instead we burn off periselene just a bit. We wait until 5 minutes past we come out from behind the Moon, and start our burn. This ends up being roughly 5.5 minutes after periselene. This allows the Deep Space Network to get a lock on us and telemetry to start flowing before the burn starts. So the altitude at the end of this burn is at about 750 km, but the actual periselene altitude is closer to 590 km]. After 3 revolutions in this orbit, 3rd-body Earth gravitational perturbations will have lowered periselene to an altitude of 250 km (by design). At this point, LOI-2 will be performed on 9 Oct 2013 10:37 UTC ( to place LADEE into a 4 hr orbit (also with a 250 km periselene altitude). LADEE will spend 3 days in this orbit until LOI-3 (12 Oct 2013 10:37 UTC), which circularizes the orbit at 250 km. LADEE will spend 30 days in this “commissioning orbit”, and will also perform tests using the laser communications experiment (LLCD). The timing and magnitudes of the maneuvers leading to the commissioning orbit are given below.
LADEE on 9-28-2013 5:48 (Earth-Moon rotating frame)
Executed Maneuvers:
AM1 11 Sep 2013 23:00:00.000 9.34 m/sec
PM1 13 Sep 2013 16:36:08.000 16.96 m/sec
PM2 21 Sep 2013 11:53:19.000 17.492 m/sec
Planned Maneuvers
TCM1 01 Oct 2013 22:00:00.000 0.9 m/sec
LOI1 06 Oct 2013 10:57:00.210 329.86 m/sec
LAM1 07 Oct 2013 22:51:32.205 0 m/sec (error corrections for LOI-1)
LOI2 09 Oct 2013 10:37:55.651 295.99 m/sec
LOI3 12 Oct 2013 10:37:34.993 238.56 m/sec
Here’s a quick LADEE update for Sept. 22, 2013. The LADEE team performed a second Perigee maneuver yesterday (21 Sep. 2013, 11:53 UTC) to raise LADEE’s orbit to have a period of 10 days, and to set up the spacecraft for Lunar capture on Oct. 6. LADEE’s path to this point is shown in dotted lines, while the upcoming trajectory is shown as solid. Note that LADEE is now in phasing loop 3, and will continue around a full orbit that will conclude on October 1st. LADEE will then begin the final portion of its trajectory, the 5 day trip to the Moon which concludes on Oct 6 with Lunar Orbit Insertion burn LOI-1. No further deterministic maneuvers are required (only a small TCM to correct out statistical errors from PM2) before the LOI phase begins. So even though LADEE has a full Earth orbit left, it is Moon-bound. LADEE is still in an elliptical orbit of the Earth, but at the next apogee LADEE will encounter the Moon.
LADEE today in Earth-Moon Rotating Coordinate Frame
LADEE today in Earth-Centered Inertial Coordinate Frame