IBEX_2016_074_o0320a_Recovery_v001.scr,

and I approve.

There are no constraint violations in

IBEX_2016_074_o0320a_Recovery_v001.ccvr.

The PL commands in the v001 ATS match those in the v002 STF,

IBEX_2016_074_o0320a_v002.stf

except the



ACT_SetSpinPulseProtectEnable Enable

commands are commented out as desired.

Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,

IBEX_2016_074_o0320a_Recovery_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  It starts 2- days before 15 Re descending and ends 10 hours after perigee.  Some despinning may be required due to this outage.

There is one moon in Lo FOV session in arc A.  The ATS start time is 4 1/2 hours after that in the OEF and the ATS end time is about an hour after that in the OEF.  These differences are not unusual.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit320_RecoveryContacts.txt,

for all contacts (3).

No battery cell balancing this orbit; we'll do it again in the next orbit.

The sun precession maneuver at perigee of orbit 319 left us pointing in safe directions for the orbit 320 arc A ascending and descending sequences:

ibex_rotate -o -r +353.833 -d -2.650 -w ibex-sun -t 2016/03:14:13:40:12

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.993150,-0.107312,-0.046235

 which is     R.A. +353.833 Decl.  -2.650

 missing      R.A. +354.684 Decl.  -2.314 (ibex-sun)

 error is     R.A.   +0.851 Decl.  +0.336

 for a total  0.914 deg

ibex_rotate -o -r +353.833 -d -2.650 -w ibex-sun -t 2016/03:18:14:36:53

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.993150,-0.107312,-0.046235

 which is     R.A. +353.833 Decl.  -2.650

 missing      R.A. +358.455 Decl.  -0.703 (ibex-sun)

 error is     R.A.   +4.622 Decl.  +1.947

 for a total  5.013 deg

The sun precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences:

ibex_rotate -o -r +358.523 -d -0.673 -w ibex-sun -t 2016/03:18:16:25:01

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.999599,-0.025774,-0.011746

 which is     R.A. +358.523 Decl.  -0.673

 missing      R.A. +358.523 Decl.  -0.673 (ibex-sun)

 error is     R.A.   +0.000 Decl.  +0.000

 for a total  0.000 deg

ibex_rotate -o -r +358.523 -d -0.673 -w ibex-sun -t 2016/03:18:17:55:07

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.999599,-0.025774,-0.011746

 which is     R.A. +358.523 Decl.  -0.673

 missing      R.A. +358.579 Decl.  -0.648 (ibex-sun)

 error is     R.A.   +0.056 Decl.  +0.025

 for a total  0.061 deg

ibex_rotate -o -r +358.523 -d -0.673 -w ibex-sun -t 2016/03:22:19:19:13

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.999599,-0.025774,-0.011746

 which is     R.A. +358.523 Decl.  -0.673

 missing      R.A.   +2.155 Decl.  +0.952 (ibex-sun)

 error is     R.A. +356.368 Decl.  +1.625

 for a total  3.978 deg

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 321 apogee:

ibex_rotate -o -r +2.246 -d +0.991 -w ibex-sun -t 2016/03:22:21:47:13

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.999082,+0.039184,+0.017295

 which is     R.A.   +2.246 Decl.  +0.991

 missing      R.A.   +2.246 Decl.  +0.991 (ibex-sun)

 error is     R.A.   +0.000 Decl.  +0.000

 for a total  0.000 deg

ibex_rotate -o -r +2.246 -d +0.991 -w ibex-sun -t 2016-03-27T19:18:19.262Z

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.999082,+0.039184,+0.017295

 which is     R.A.   +2.246 Decl.  +0.991

 missing      R.A.   +6.833 Decl.  +2.920 (ibex-sun)

 error is     R.A.   +4.587 Decl.  +1.929

 for a total  4.973 deg

No Lo O-mode.

There is no overlap with orbit 319 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Ken