[Isocops] IBEX Orbit #462 ATS Approval ( 26 Sept - 5 Oct 2019 ) Version 2 - v002 approval
KEN FAIRCHILD
fair-play at comcast.net
Sat Sep 21 02:27:00 EDT 2019
All,
Note: Angle at orbit 462 arc B descending after the apogee sun precession maneuver: 4.076 deg
Note: Angle at orbit 463 apogee after the perigee sun precession maneuver: 4.583 deg
I have looked at the orbit 462 ATS,
IBEX_2019_269_o0462a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2019_269_o0462a_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v002 ATS match those in the v002 STF,
IBEX_2019_269_o0462a_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_2019_269_o0462a_v003.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit462_Contacts_v2.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 sun precession maneuver at perigee of orbit 461 left us pointing in safe directions for the orbit 462 arc A ascending and descending sequences:
ibex_rotate -o -r +182.046 -d -0.871 -w ibex-sun -t 2019/09:26:14:04:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999247,-0.035698,-0.015201
which is R.A. +182.046 Decl. -0.871
missing R.A. +182.690 Decl. -1.188 (ibex-sun)
error is R.A. +0.644 Decl. +0.317
for a total 0.718 deg
ibex_rotate -o -r +182.046 -d -0.871 -w ibex-sun -t 2019/09:30:12:46:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999247,-0.035698,-0.015201
which is R.A. +182.046 Decl. -0.871
missing R.A. +186.150 Decl. -2.653 (ibex-sun)
error is R.A. +4.104 Decl. +1.782
for a total 4.472 deg
The sun 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 -r +186.218 -d -2.681 -w ibex-sun -t 2019/09:30:14:34:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993029,-0.108193,-0.046775
which is R.A. +186.218 Decl. -2.681
missing R.A. +186.218 Decl. -2.681 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +186.218 -d -2.681 -w ibex-sun -t 2019/09:30:16:04:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993029,-0.108193,-0.046775
which is R.A. +186.218 Decl. -2.681
missing R.A. +186.275 Decl. -2.705 (ibex-sun)
error is R.A. +0.057 Decl. +0.024
for a total 0.062 deg
ibex_rotate -o -r +186.218 -d -2.681 -w ibex-sun -t 2019/10:04:14:52:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993029,-0.108193,-0.046775
which is R.A. +186.218 Decl. -2.681
missing R.A. +189.977 Decl. -4.274 (ibex-sun)
error is R.A. +3.759 Decl. +1.593
for a total 4.076 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 463 apogee:
ibex_rotate -o -r +190.099 -d -4.332 -w ibex-sun -t 2019/10:04:18:01:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.981694,-0.174849,-0.075536
which is R.A. +190.099 Decl. -4.332
missing R.A. +190.099 Decl. -4.332 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +190.099 -d -4.332 -w ibex-sun -t 2019-10-09T12:51:04.351Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.981694,-0.174849,-0.075536
which is R.A. +190.099 Decl. -4.332
missing R.A. +194.336 Decl. -6.121 (ibex-sun)
error is R.A. +4.237 Decl. +1.789
for a total 4.583 deg
No Lo O-mode.
There is no overlap with orbit 461 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On September 17, 2019 at 12:31 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #462
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB Sept 21, 2019.
>
>
> Please note the following:
>
> 1. Battery Balancing
>
>
>
> 1. 2 Sun maneuvers
>
>
>
> 1. Command Load Constraint Violation Report (CCVR)
>
> # Filename: IBEX_2019_269_o0462a_v002.ccvr
>
>
>
> ==========================
>
> 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 2019/09/26 11:46:57 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/09/30 15:34:23 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
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