[Isocops] IBEX Orbit# 410 ATS Approval (10 Jun 18 - 20 Jun 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Thu May 31 01:54:53 EDT 2018
All,
I have looked at the orbit 410 ATS,
IBEX_2018_161_o0410a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_161_o0410a_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_161_o0410a_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_161_o0410a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 5 hours before perigee and runs for 6 1/2 hours. No despinning should be required due to this outage.
There is one moon in Lo FOV session in arc B. The ATS start time is about an hour after that in the OEF and the end times are the same. Differences in timing are not unusual.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit410_Contacts.txt,
for all contacts (3).
No battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 409 left us pointing in safe directions for the orbit 410 arc A ascending and descending sequences:
ibex_rotate -o -u 0.221459,0.898369,0.379327 -w ibex-sun -t 2018/06:11:01:41:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.221459,+0.898369,+0.379327
which is R.A. +76.152 Decl. +22.292
missing R.A. +78.939 Decl. +23.027 (ibex-sun)
error is R.A. +2.787 Decl. +0.735
for a total 2.675 deg
ibex_rotate -o -u 0.221459,0.898369,0.379327 -w ibex-sun -t 2018/06:14:20:21:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.221459,+0.898369,+0.379327
which is R.A. +76.152 Decl. +22.292
missing R.A. +82.935 Decl. +23.258 (ibex-sun)
error is R.A. +6.783 Decl. +0.966
for a total 6.328 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 0.145408,0.911789,0.384054 -w ibex-sun -t 2018/06:14:22:04:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.145408,+0.911789,+0.384054
which is R.A. +80.939 Decl. +22.585
missing R.A. +83.011 Decl. +23.263 (ibex-sun)
error is R.A. +2.072 Decl. +0.678
for a total 2.025 deg
ibex_rotate -o -u 0.145408,0.911789,0.384054 -w ibex-sun -t 2018/06:14:23:39:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.145408,+0.911789,+0.384054
which is R.A. +80.939 Decl. +22.585
missing R.A. +83.081 Decl. +23.267 (ibex-sun)
error is R.A. +2.142 Decl. +0.682
for a total 2.087 deg
ibex_rotate -o -u 0.145408,0.911789,0.384054 -w ibex-sun -t 2018/06:19:13:34:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.145408,+0.911789,+0.384054
which is R.A. +80.939 Decl. +22.585
missing R.A. +87.823 Decl. +23.446 (ibex-sun)
error is R.A. +6.884 Decl. +0.861
for a total 6.394 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 411 apogee:
ibex_rotate -o -u 0.066062,0.919133,0.388368 -w ibex-sun -t 2018/06:19:16:10:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.066062,+0.919133,+0.388368
which is R.A. +85.889 Decl. +22.853
missing R.A. +87.929 Decl. +23.444 (ibex-sun)
error is R.A. +2.040 Decl. +0.591
for a total 1.966 deg
ibex_rotate -o -u 0.066062,0.919133,0.388368 -w ibex-sun -t 2018-06-24T15:47:31.688Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.066062,+0.919133,+0.388368
which is R.A. +85.889 Decl. +22.853
missing R.A. +93.126 Decl. +23.394 (ibex-sun)
error is R.A. +7.237 Decl. +0.541
for a total 6.676 deg
No Lo O-mode.
There is no overlap with orbit 409 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On May 29, 2018 at 7:01 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 410
>
> Please respond to this email thread with your comments and approvals
>
> Approvals are required before 31 May 18 @1800 UTC
>
>
>
> Note the following:
>
> 1. No Battery Balancing at Perigee
>
> 2. Moon in Lo FOV Commands
>
> # 2018-06-19T01:52:41.054Z,MoonInLoFovStart,orbit:410
>
> # 2018-06-19T11:54:27.812Z,MoonInLoFovStop,orbit:410
>
>
>
> 3. Command Load Constraint Violation Report
>
> IBEX_2018_161_o0410a_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 2018/06/10 23:51:07 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/06/14 23:09:39 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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