[Isocops] IBEX Orbit# 399 ATS Approval (2 Mar 18 - 11 Mar 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Feb 21 14:43:48 EST 2018
All,
I have looked at the orbit 399 ATS,
IBEX_2018_061_o0399a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_061_o0399a_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_061_o0399a_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_061_o0399a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts before 15 Re ascending and ends about 7 hours before apogee (delaying the apogee maneuver). Some despinning may be required due to this outage.
There is one moon in Lo FOV session in arc B. The ATS start time is about 2 1/2 hours before that in the OEF and the ATS end time is 4 1/2+ 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_Orbit399_Contacts.txt,
for all contacts (2).
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 398 left us pointing in safe directions for the orbit 399 arc A ascending and descending sequences:
ibex_rotate -o -u 0.957193,-0.261338,-0.124433 -w ibex-sun -t 2018/03:03:10:17:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.957193,-0.261338,-0.124433
which is R.A. +344.729 Decl. -7.148
missing R.A. +343.919 Decl. -6.873 (ibex-sun)
error is R.A. +0.810 Decl. +0.275
for a total 0.850 deg
ibex_rotate -o -u 0.957193,-0.261338,-0.124433 -w ibex-sun -t 2018/03:07:09:49:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.957193,-0.261338,-0.124433
which is R.A. +344.729 Decl. -7.148
missing R.A. +347.686 Decl. -5.295 (ibex-sun)
error is R.A. +2.957 Decl. +1.853
for a total 3.475 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 0.976808,-0.192457,-0.093848 -w ibex-sun -t 2018/03:07:11:33:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.976808,-0.192457,-0.093848
which is R.A. +348.854 Decl. -5.385
missing R.A. +347.752 Decl. -5.266 (ibex-sun)
error is R.A. +1.102 Decl. +0.119
for a total 1.104 deg
ibex_rotate -o -u 0.976808,-0.192457,-0.093848 -w ibex-sun -t 2018/03:07:13:07:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.976808,-0.192457,-0.093848
which is R.A. +348.854 Decl. -5.385
missing R.A. +347.812 Decl. -5.240 (ibex-sun)
error is R.A. +1.042 Decl. +0.145
for a total 1.048 deg
ibex_rotate -o -u 0.976808,-0.192457,-0.093848 -w ibex-sun -t 2018/03:11:07:11:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.976808,-0.192457,-0.093848
which is R.A. +348.854 Decl. -5.385
missing R.A. +351.162 Decl. -3.784 (ibex-sun)
error is R.A. +2.308 Decl. +1.601
for a total 2.803 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 400 apogee:
ibex_rotate -o -u 0.990308,-0.123016,-0.06448 -w ibex-sun -t 2018/03:11:09:25:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990308,-0.123016,-0.064480
which is R.A. +352.919 Decl. -3.697
missing R.A. +351.245 Decl. -3.751 (ibex-sun)
error is R.A. +1.674 Decl. +0.054
for a total 1.671 deg
ibex_rotate -o -u 0.990308,-0.123016,-0.06448 -w ibex-sun -t 2018-03-16T05:13:40.783Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.990308,-0.123016,-0.064480
which is R.A. +352.919 Decl. -3.697
missing R.A. +355.798 Decl. -1.833 (ibex-sun)
error is R.A. +2.879 Decl. +1.864
for a total 3.427 deg
No Lo O-mode.
There is no overlap with orbit 398 commands by manual inspection.
Command Approval Checklist is attached.
Ken
> On February 19, 2018 at 8:59 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 399.
>
> Please respond to this email thread with your questions and approvals
>
> Approvals are required before 1200 UTC on 21 Feb 18
>
>
>
> Note the following :
>
> 1. Battery Balancing at Perigee
>
> 2018-03-11T19:03:33.645Z,Perigee,orbit:399
>
> SetLongEclipseFlag TRUE $TIME=2018/03:11:18:00:00
>
> SetLongEclipseFlag FALSE $TIME=2018/03:11:19:30:00
>
>
>
> 2. Moon in Lo FOV Commands
>
> 2018-03-10T13:42:40.324Z,MoonInLoFovStart,orbit:399
>
> 2018-03-11T03:43:21.628Z,MoonInLoFovStop,orbit:399
>
>
>
> 3. Command Load Constraint Violation Report
>
> IBEX_2018_061_o0399a_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 2018/03/03 08:43:16 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/03/07 12:37:45 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 at 01D04F6C.5A1C97F0]
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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