IBEX_2017_226_o0377a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2017_226_o0377a_v001.ccvr

are from a long contact and from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

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

IBEX_2017_226_o0377a_v002.stf.

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_2017_226_o0377a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about 1/2 hour after perigee and runs for 7 1/2 hours.  No despinning should be required due to this outage.

There is one moon in Lo FOV session in arc A.  The ATS start time is one hour after that in the OEF and the ATS end time is 11+ hours 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_Orbit377_Contacts.txt,

for all contacts (3).

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.

The inertial maneuver at perigee of orbit 376 left us pointing in safe directions for the orbit 377 arc A ascending and descending sequences:

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:15:03:04:17

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.760203,+0.599769,+0.249738

 which is     R.A. +141.728 Decl. +14.462

 missing      R.A. +144.585 Decl. +14.081 (ibex-sun)

 error is     R.A.   +2.857 Decl.  +0.381

 for a total  2.795 deg

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:18:20:03:47

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.760203,+0.599769,+0.249738

 which is     R.A. +141.728 Decl. +14.462

 missing      R.A. +148.001 Decl. +12.910 (ibex-sun)

 error is     R.A.   +6.273 Decl.  +1.552

 for a total  6.289 deg

The inertial 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 -u -0.808015,0.544582,0.224815 -w ibex-sun -t 2017/08:18:21:46:55

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.808015,+0.544582,+0.224815

 which is     R.A. +146.021 Decl. +12.992

 missing      R.A. +148.069 Decl. +12.887 (ibex-sun)

 error is     R.A.   +2.048 Decl.  +0.105

 for a total  1.998 deg

ibex_rotate -o -u -0.808015,0.544582,0.224815 -w ibex-sun -t   2017/08:18:23:22:01

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.808015,+0.544582,+0.224815

 which is     R.A. +146.021 Decl. +12.992

 missing      R.A. +148.131 Decl. +12.866 (ibex-sun)

 error is     R.A.   +2.110 Decl.  +0.126

 for a total  2.060 deg

ibex_rotate -o -u -0.808015,0.544582,0.224815 -w ibex-sun -t   2017/08:23:12:53:05

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.808015,+0.544582,+0.224815

 which is     R.A. +146.021 Decl. +12.992

 missing      R.A. +152.455 Decl. +11.360 (ibex-sun)

 error is     R.A.   +6.434 Decl.  +1.632

 for a total  6.497 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 378 apogee:

ibex_rotate -o -u -0.85244,0.483348,0.1993 -w ibex-sun -t 2017/08:23:15:16:13  

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.852440,+0.483348,+0.199300

 which is     R.A. +150.446 Decl. +11.496

 missing      R.A. +152.546 Decl. +11.325 (ibex-sun)

 error is     R.A.   +2.100 Decl.  +0.171

 for a total  2.065 deg

ibex_rotate -o -u -0.85244,0.483348,0.1993 -w ibex-sun -t 2017-08-28T14:13:48.556Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.852440,+0.483348,+0.199300

 which is     R.A. +150.446 Decl. +11.496

 missing      R.A. +156.975 Decl.  +9.603 (ibex-sun)

 error is     R.A.   +6.529 Decl.  +1.893

 for a total  6.692 deg

No Lo O-mode.

There is no overlap with orbit 376 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken