IBEX_2017_217_o0376a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2017_217_o0376a_v001.ccvr

are 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_217_o0376a_v002.stf,

except the ATS has an SSR_DUMP_NEW command.  This is expected as APL is being used for the dump pass.

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_217_o0376a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages.  The first starts about 10 hours after orbit 375 perigee and ends about 20 hours after 15 Re ascending.  The second starts 20 minutes before perigee and runs for about 7 1/2 hours.  Some despinning may be required due to the first outage.

There are two moon in Lo FOV sessions in arc B.  The ATS start time of the first session is 2 hours after that in the OEF and the ATS end time is 8+ hours before that in the OEF.  The ATS start time of the second session is about 6 hours after that in the OEF and the ATS and OEF end times are the same.  Differences in timing are not unusual.

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

IBEX_Orbit376_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 375 left us pointing in safe directions for the orbit 376 arc A ascending and descending sequences:

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:23:54:31

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.652599,+0.698897,+0.292672

 which is     R.A. +133.038 Decl. +17.018

 missing      R.A. +135.928 Decl. +16.758 (ibex-sun)

 error is     R.A.   +2.890 Decl.  +0.260

 for a total  2.778 deg

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:09:13:41:49

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.652599,+0.698897,+0.292672

 which is     R.A. +133.038 Decl. +17.018

 missing      R.A. +139.313 Decl. +15.754 (ibex-sun)

 error is     R.A.   +6.275 Decl.  +1.264

 for a total  6.151 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 -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:15:24:57

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.707368,+0.652558,+0.271659

 which is     R.A. +137.308 Decl. +15.763

 missing      R.A. +139.383 Decl. +15.733 (ibex-sun)

 error is     R.A.   +2.075 Decl.  +0.030

 for a total  1.997 deg

ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:17:00:03

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.707368,+0.652558,+0.271659

 which is     R.A. +137.308 Decl. +15.763

 missing      R.A. +139.446 Decl. +15.715 (ibex-sun)

 error is     R.A.   +2.138 Decl.  +0.048

 for a total  2.059 deg

ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:14:03:51:16

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.707368,+0.652558,+0.271659

 which is     R.A. +137.308 Decl. +15.763

 missing      R.A. +143.741 Decl. +14.404 (ibex-sun)

 error is     R.A.   +6.433 Decl.  +1.359

 for a total  6.358 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 377 apogee:

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:14:06:13:11

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. +143.832 Decl. +14.372 (ibex-sun)

 error is     R.A.   +2.104 Decl.  +0.090

 for a total  2.040 deg

ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017-08-19T07:36:36.557Z

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. +148.456 Decl. +12.757 (ibex-sun)

 error is     R.A.   +6.728 Decl.  +1.705

 for a total  6.757 deg

No Lo O-mode.

There is no overlap with orbit 375 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken