LADEE Trajectory Update 10-9-13: 4 hrs to LOI-2

Lunar Orbit Insertion Maneuver 2 (LOI-2) is upon us, scheduled for 09 Oct 2013 10:38 UTC.  This maneuver will lower our periselene altitude from 15700 km down to 2220 km and change our orbit period from 24 hrs to 4 hrs.

The maneuver will last for 220.8 seconds, and will impart a delta-V (change in velocity) of 293 m/sec.

Right now LADEE sees this view:

 

ladee view

 

 

And the orbit from above would look like this:

 

topview

 

 

From Earth, if you could see the orbit, you’d see this:

 

earth view

 

 

Go LADEE!

LADEE Trajectory Update: 10-08-13

LADEE is now in its last rev in the 24 hour capture orbit, and preparing for LOI-2, which will lower the spacecraft into a 4 hr orbit.  LOI-2 is scheduled for 10:38 UTC (3:38 AM PDT) Wed. morning, Oct. 9. Here’s the view from LADEE to the Moon:

 

moonandsun

 

Here’s the orbit [Note: blue shows the 4 hr orbit we’re going to next.  Dotted lines show the past trajectory, solid are into the future.  So we’re not quite at aposelene yet.]

 

lunar orbit

 

And finally the really cool view AstrogatorJohn came up with yesterday of the view of the orbit from the Earth:

 

moonfromearth

 

So if you go outside tonight and see the Moon, imagine this orbit.

LADEE Update 10-07-13: Safe in Lunar Orbit after LOI-1

The LADEE Spacecraft successfully performed Lunar Orbit Insertion maneuver 1 (LOI-1) on Oct. 6, 2013 3:57 PDT.   The LOI-1 maneuver captured LADEE into a 24 hr orbit.  After 3 days (and 3 revs) in the capture orbit, the spacecraft will perform LOI-2 on Oct. 9 at 3:37 PDT.  The second of 3 Lunar Orbit Insertion maneuvers, LOI-2 will reduce LADEE’s orbit down to a 4 hr orbit.

Finally, LOI-3 will be performed Oct. 12 at 8:00 PM PDT to circularize the spacecraft in a 235 km orbit.  LADEE will spend a month in this “commissioning” orbit, while the spacecraft is checked out before full-time lunar science begins, and the Laser-Communications experiment will be tested.

 

Moon View

 

 

At this time (7 Oct. 2013 7:53) LADEE is past its first aposelene, and is headed for its first periselene after capture.

 

 

Moon centered

 

LADEE in Lunar Orbit

The LADEE spacecraft is now in Lunar orbit.  Tracking data will later confirm the precise parameters of the orbit, but based on telemetry of thruster performance and accelerations, the LOI-1 burn appears to be close to nominal.

The planned Lunar orbit has an orbit period of 23.1 hrs.  The next planned maneuver (Lunar Aposelene Maneuver 1, or LAM1) is scheduled for the 2nd aposelene, which would occur roughly 1.5 days from now.  For LOI-1 results close to nominal, this maneuver can be waived.

LOI-2 is nominally scheduled for 3 revs after LOI-1.