All,
Note: Angle at orbit 402 apogee after the perigee sun precession maneuver: 4.891 deg
I have looked at the orbit 401 ATS,
IBEX_2018_079_o0401a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_079_o0401a_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_2018_079_o0401a_v002.stf.
Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,
IBEX_2018_079_o0401a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 5 1/2 hours before 15 Re descending and runs for 1+ days. Some despinning may be required due to this outage.
There is one moon in Lo FOV session in arc A. The ATS start time is about 8 1/2 hours after that in the OEF and the ATS end time is 4+ hours after 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_Orbit401_Contacts.txt,
for all contacts (3).
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 400 left us pointing in safe directions for the orbit 401 arc A ascending and descending sequences:
ibex_rotate -o -u 0.998962,-0.037224,-0.026264 -w ibex-sun -t 2018/03:21:04:04:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998962,-0.037224,-0.026264
which is R.A. +357.866 Decl. -1.505
missing R.A. +0.232 Decl. +0.076 (ibex-sun)
error is R.A. +357.634 Decl. +1.581
for a total 2.845 deg
ibex_rotate -o -u 0.998962,-0.037224,-0.026264 -w ibex-sun -t 2018/03:24:17:53:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998962,-0.037224,-0.026264
which is R.A. +357.866 Decl. -1.505
missing R.A. +3.587 Decl. +1.531 (ibex-sun)
error is R.A. +354.279 Decl. +3.036
for a total 6.476 deg
The inertial precession 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 0.999359,0.035562,0.004206 -w ibex-sun -t 2018/03:24:19:36:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999359,+0.035562,+0.004206
which is R.A. +2.038 Decl. +0.241
missing R.A. +3.652 Decl. +1.561 (ibex-sun)
error is R.A. +1.614 Decl. +1.320
for a total 2.084 deg
ibex_rotate -o -u 0.999359,0.035562,0.004206 -w ibex-sun -t 2018/03:24:21:11:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999359,+0.035562,+0.004206
which is R.A. +2.038 Decl. +0.241
missing R.A. +3.712 Decl. +1.587 (ibex-sun)
error is R.A. +1.674 Decl. +1.346
for a total 2.148 deg
ibex_rotate -o -u 0.999359,0.035562,0.004206 -w ibex-sun -t 2018/03:29:06:59:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999359,+0.035562,+0.004206
which is R.A. +2.038 Decl. +0.241
missing R.A. +7.594 Decl. +3.305 (ibex-sun)
error is R.A. +5.556 Decl. +3.064
for a total 6.342 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 402 apogee:
ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018/03:29:09:30:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.989332,+0.133517,+0.058278
which is R.A. +7.686 Decl. +3.341
missing R.A. +7.686 Decl. +3.341 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018-04-03T05:19:30.394Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.989332,+0.133517,+0.058278
which is R.A. +7.686 Decl. +3.341
missing R.A. +12.212 Decl. +5.225 (ibex-sun)
error is R.A. +4.526 Decl. +1.884
for a total 4.891 deg
No Lo O-mode.
There is no overlap with orbit 400 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On March 8, 2018 at 4:50 PM "Wesley, Sheral" <Sheral.Wesley@OrbitalATK.com> wrote:
Guys,
Here are the planning files and ATS for Orbit# 401
Please respond to this email thread with your comments and approvals
Approvals are required before 10 Mar 18 @2000 UTC
Note the following :
1. Perigee Sun Maneuver
2018-03-29T01:38:55.360Z,StarTrackerOutageStart,dueTo:moon,orbit:401
2018-03-29T09:15:47.000Z,ManeuverWindowStart
2018-03-29T09:45:49.000Z,ManeuverWindowEnd,orbit:401
2018-03-30T04:28:00.000Z,StarTrackerOutageStop,dueTo:moon,orbit:401
2. Moon in Lo FOV Commands
2018-03-23T05:35:38.640Z,MoonInLoFovStart,orbit:401
2018-03-24T09:18:32.382Z,MoonInLoFovStop,orbit:401
3. No Battery Balancing
4. Command Load Constraint Violation Report
IBEX_2018_079_o0401a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/03/21 02:22:10 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/03/24 20:41:25 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Sheral R. Wesley
Sr Systems Engineer
IBEX , OCO2 Mission OPS
CRS/CYGNUS Mission Planning
Bldg. 2 Room 1337
Office (703) 406-5641
Cell (202) 236-0802
![cid:image001.jpg@01D04F6C.5A1C97F0]()
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*********************