[Isocops] Orbit 198 v001 ATS - approval

[fair-play at comcast.net]

All, 


I've looked at the orbit 198 ATS, 


IBEX_2013_059_o0198a_v001.scr, 


and I approve. 


There are no constraint violations in 


IBEX_2013_059_o0198a_v001.ccvr. 


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


IBEX_2013_059_o0198a_v001.stf. 


Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time (8 hours earlier than usual), and 15 Re descending as determined from the OEF file, 


IBEX_2013_059_o0198a_v001.oef, 


and as verified with ibex_orbit. 


There is a star tracker outage starting about 9 hours before apogee and running for 3 days and 6+ hours. 


There is a moon in Lo FOV session in arc B. The ATS start time is about 0.5 hour later than that in the OEF file and the end time is a bit over 4 hours earlier. 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_Orbit198Contacts.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 197 left us pointing in safe directions for orbit 198 arc A ascending and descending sequences: 



ibex_rotate -o -u 0.943307,-0.300594,-0.140763 -w ibex-sun -t 2013/03:01:02:20:53 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.943307,-0.300594,-0.140763 
which is R.A. +342.325 Decl. -8.092 
missing R.A. +342.016 Decl. -7.623 (ibex-sun) 
error is R.A. +0.309 Decl. +0.469 
for a total 0.560 deg 



ibex_rotate -o -u 0.943307,-0.300594,-0.140763 -w ibex-sun -t 2013/03:04:09:40:04 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.943307,-0.300594,-0.140763 
which is R.A. +342.325 Decl. -8.092 
missing R.A. +345.123 Decl. -6.386 (ibex-sun) 
error is R.A. +2.798 Decl. +1.706 
for a total 3.258 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 0.960031,-0.252594,-0.12057 -w ibex-sun -t 2013/03:04:11:23:12 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.960031,-0.252594,-0.120570 
which is R.A. +345.259 Decl. -6.925 
missing R.A. +345.189 Decl. -6.359 (ibex-sun) 
error is R.A. +0.070 Decl. +0.566 
for a total 0.570 deg 



ibex_rotate -o -u 0.960031,-0.252594,-0.12057 -w ibex-sun -t 2013/03:04:12:58:18 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.960031,-0.252594,-0.120570 
which is R.A. +345.259 Decl. -6.925 
missing R.A. +345.249 Decl. -6.334 (ibex-sun) 
error is R.A. +0.010 Decl. +0.591 
for a total 0.591 deg 



ibex_rotate -o -u 0.960031,-0.252594,-0.12057 -w ibex-sun -t 2013/03:09:08:24:15 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.960031,-0.252594,-0.120570 
which is R.A. +345.259 Decl. -6.925 
missing R.A. +349.618 Decl. -4.468 (ibex-sun) 
error is R.A. +4.359 Decl. +2.457 
for a total 4.985 deg 


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 199 apogee: 



ibex_rotate -o -u 0.973645,-0.205037,-0.099875 -w ibex-sun -t 2013/03:09:10:26:28 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.973645,-0.205037,-0.099875 
which is R.A. +348.108 Decl. -5.732 
missing R.A. +349.698 Decl. -4.432 (ibex-sun) 
error is R.A. +1.590 Decl. +1.300 
for a total 2.048 deg 



ibex_rotate -o -u 0.973645,-0.205037,-0.099875 -w ibex-sun -t 2013-03-14T11:15:37.939Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.973645,-0.205037,-0.099875 
which is R.A. +348.108 Decl. -5.732 
missing R.A. +354.418 Decl. -2.451 (ibex-sun) 
error is R.A. +6.310 Decl. +3.281 
for a total 7.097 deg 


No Lo O-mode. 


There is no overlap with orbit 197 commands by manual inspection or by checking at 


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



The Command Approval Checklist is attached. 


The apogee maneuver in this orbit completes the transition from Lo ISN mode pointing to our nominal pointing. 


Ken 



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