IBEX_2017_208_o0375a_pre_eclipse_v001.scr

and

IBEX_2017_208_o0375a_post_eclipse_v002.scr,

IBEX_2017_208_o0375a_v001.ccvr

are due to proximity/length of contacts, the eclipse and from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in the v001/v002 ATS files match those in the v003 STF,

IBEX_2017_208_o0375a_v003.stf.

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

IBEX_2017_208_o0375a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts about an hour before perigee and runs for about 11 1/2 hours.  No despinning should be required due to this outage.

There is one moon in Lo FOV session but it occurs while the payload is off due to the eclipse.

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

IBEX_Orbit375_Contacts.txt,

for all contacts (6).  There will also be several post-eclipse contacts with blind acqs.

No battery cell balancing because of the eclipse.

The inertial maneuver at perigee of orbit 374 left us pointing in safe directions for the orbit 375 arc A ascending and descending sequences:

ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:27:21:12:37

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.530544,+0.781435,+0.328455

 which is     R.A. +124.174 Decl. +19.175

 missing      R.A. +127.087 Decl. +19.055 (ibex-sun)

 error is     R.A.   +2.913 Decl.  +0.120

 for a total  2.755 deg

ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:31:11:10:32

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.530544,+0.781435,+0.328455

 which is     R.A. +124.174 Decl. +19.175

 missing      R.A. +130.579 Decl. +18.197 (ibex-sun)

 error is     R.A.   +6.405 Decl.  +0.978

 for a total  6.145 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 -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:12:53:40

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.592252,+0.743311,+0.311008

 which is     R.A. +128.547 Decl. +18.120

 missing      R.A. +130.650 Decl. +18.180 (ibex-sun)

 error is     R.A.   +2.103 Decl.  +0.060

 for a total  1.999 deg

ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:14:28:46

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.592252,+0.743311,+0.311008

 which is     R.A. +128.547 Decl. +18.120

 missing      R.A. +130.715 Decl. +18.164 (ibex-sun)

 error is     R.A.   +2.168 Decl.  +0.044

 for a total  2.061 deg

ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/08:05:00:17:20

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.592252,+0.743311,+0.311008

 which is     R.A. +128.547 Decl. +18.120

 missing      R.A. +135.053 Decl. +17.051 (ibex-sun)

 error is     R.A.   +6.506 Decl.  +1.069

 for a total  6.293 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 376 apogee:

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:02:31:49 

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. +135.141 Decl. +17.025 (ibex-sun)

 error is     R.A.   +2.103 Decl.  +0.007

 for a total  2.011 deg

ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017-08-10T01:14:57.970Z

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. +139.779 Decl. +15.618 (ibex-sun)

 error is     R.A.   +6.741 Decl.  +1.400

 for a total  6.618 deg

No Lo O-mode.

There is no overlap with orbit 374 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken