[Isocops] Orbit 200 ATS v001 - approval

[fair-play at comcast.net]

All, 


I've looked at the orbit 200 ATS, 


IBEX_2013_078_o0200a_v001.scr, 


and I approve. 


There are no constraint violations in 


IBEX_2013_078_o0200a_v001.ccvr. 


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


IBEX_2013_077_o0200a_v001.stf. 


(I've traced the DOY difference in the filenames to conversion to local time in the STF filename generation code.) 


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 file, 


IBEX_2013_078_o0200a_v001.oef, 


and as verified with ibex_orbit. 


There is a star tracker outage that starts a day+ after apogee and it runs for almost 3 days. 


There is one moon in Lo FOV session in arc A. The ATS start time is about 1 hour after the OEF start time and the ATS end time is about 3.5 hours after the OEF end time. 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_Orbit200Contacts.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 199 left us pointing in safe directions for orbit 200 arc A ascending and descending sequences: 



ibex_rotate -o -u 0.997648,-0.058205,-0.03619 -w ibex-sun -t 2013/03:19:15:03:55 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.997648,-0.058205,-0.036190 
which is R.A. +356.661 Decl. -2.074 
missing R.A. +359.104 Decl. -0.388 (ibex-sun) 
error is R.A. +2.443 Decl. +1.686 
for a total 2.968 deg 



ibex_rotate -o -u 0.997648,-0.058205,-0.03619 -w ibex-sun -t 2013/03:23:08:56:48 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.997648,-0.058205,-0.036190 
which is R.A. +356.661 Decl. -2.074 
missing R.A. +2.566 Decl. +1.075 (ibex-sun) 
error is R.A. +354.095 Decl. +3.149 
for a total 6.692 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 0.999829,0.01822,-0.003002 -w ibex-sun -t 2013/03:23:10:39:56 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.999829,+0.018220,-0.003002 
which is R.A. +1.044 Decl. -0.172 
missing R.A. +2.631 Decl. +1.103 (ibex-sun) 
error is R.A. +1.587 Decl. +1.275 
for a total 2.035 deg 



ibex_rotate -o -u 0.999829,0.01822,-0.003002 -w ibex-sun -t 2013/03:23:12:15:02 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.999829,+0.018220,-0.003002 
which is R.A. +1.044 Decl. -0.172 
missing R.A. +2.690 Decl. +1.129 (ibex-sun) 
error is R.A. +1.646 Decl. +1.301 
for a total 2.098 deg 



ibex_rotate -o -u 0.999829,0.01822,-0.003002 -w ibex-sun -t 2013/03:28:02:38:43 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.999829,+0.018220,-0.003002 
which is R.A. +1.044 Decl. -0.172 
missing R.A. +6.765 Decl. +2.924 (ibex-sun) 
error is R.A. +5.721 Decl. +3.096 
for a total 6.503 deg 


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 201 apogee: 



ibex_rotate -o -u 0.995298,0.092384,0.029091 -w ibex-sun -t 2013/03:28:04:38:46 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.995298,+0.092384,+0.029091 
which is R.A. +5.303 Decl. +1.667 
missing R.A. +6.841 Decl. +2.958 (ibex-sun) 
error is R.A. +1.537 Decl. +1.291 
for a total 2.007 deg 



ibex_rotate -o -u 0.995298,0.092384,0.029091 -w ibex-sun -t 2013-04-02T04:58:42.271Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.995298,+0.092384,+0.029091 
which is R.A. +5.303 Decl. +1.667 
missing R.A. +11.521 Decl. +4.912 (ibex-sun) 
error is R.A. +6.218 Decl. +3.245 
for a total 7.004 deg 


No Lo O-mode. 


There is no overlap with orbit 199 commands by manual inspection or by checking at 


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



The Command Approval Checklist is attached. 


Ken 
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