IBEX_2017_190_o0373a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2017_190_o0373a_v001.ccvr

are from proximity of contacts 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_190_o0373a_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_190_o0373a_v001.oef,

and as verified with ibex_orbit.

There are two star tracker outages.  The first starts before orbit 372 15 Re descending and ends 3 1/2 hours after 15 Re ascending.  The second starts 2 1/2 hours before perigee and runs for 6 1/2 hours.  Some despinning may be required due to the first outage.

There is one moon in Lo FOV session.  It starts in arc A and ends in arc B.  The ATS start time is four hours after that in the OEF and the ATS end time is 3 hours before 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_Orbit373_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 sun precession maneuver at perigee of orbit 372 left us pointing in safe directions for the orbit 373 arc A ascending and descending sequences:

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017/07:09:12:16:55

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.282545,+0.879972,+0.381861

 which is     R.A. +107.801 Decl. +22.449

 missing      R.A. +108.653 Decl. +22.309 (ibex-sun)

 error is     R.A.   +0.852 Decl.  +0.140

 for a total  0.800 deg

ibex_rotate -o -r +107.801 -d +22.449 -w ibex-sun -t 2017/07:13:01:13:42

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.282545,+0.879972,+0.381861

 which is     R.A. +107.801 Decl. +22.449

 missing      R.A. +112.288 Decl. +21.828 (ibex-sun)

 error is     R.A.   +4.487 Decl.  +0.621

 for a total  4.202 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 -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:13:02:56:50

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.321566,+0.872816,+0.367134

 which is     R.A. +110.225 Decl. +21.539

 missing      R.A. +112.362 Decl. +21.819 (ibex-sun)

 error is     R.A.   +2.137 Decl.  +0.280

 for a total  2.006 deg

ibex_rotate -o -u -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:13:04:31:56

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.321566,+0.872816,+0.367134

 which is     R.A. +110.225 Decl. +21.539

 missing      R.A. +112.431 Decl. +21.810 (ibex-sun)

 error is     R.A.   +2.206 Decl.  +0.271

 for a total  2.067 deg

ibex_rotate -o -u -0.321566,0.872816,0.367134 -w ibex-sun -t 2017/07:17:14:13:00

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.321566,+0.872816,+0.367134

 which is     R.A. +110.225 Decl. +21.539

 missing      R.A. +116.924 Decl. +21.155 (ibex-sun)

 error is     R.A.   +6.699 Decl.  +0.384

 for a total  6.251 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 374 apogee:

ibex_rotate -o -u -0.393433,0.847229,0.35695 -w ibex-sun -t 2017/07:17:16:26:56

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.393433,+0.847229,+0.356950

 which is     R.A. +114.909 Decl. +20.913

 missing      R.A. +117.013 Decl. +21.138 (ibex-sun)

 error is     R.A.   +2.104 Decl.  +0.225

 for a total  1.977 deg

ibex_rotate -o -u -0.393433,0.847229,0.35695 -w ibex-sun -t 2017-07-22T17:36:35.558Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.393433,+0.847229,+0.356950

 which is     R.A. +114.909 Decl. +20.913

 missing      R.A. +122.014 Decl. +20.160 (ibex-sun)

 error is     R.A.   +7.105 Decl.  +0.753

 for a total  6.696 deg

No Lo O-mode.

There is no overlap with orbit 372 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken