[Isocops] IBEX Orbit #424 ATS Approval ( 16 - 25 Oct ) - v001 approval
Ken Fairchild
fair-play at comcast.net
Sat Oct 6 10:43:30 EDT 2018
All,
Note: Angle at orbit 424 arc B descending after the apogee sun precession maneuver: 4.007 deg
Angle at orbit 425 apogee after the perigee sun precession maneuver: 4.748 deg
I have looked at the orbit 424 ATS,
IBEX_2018_289_o0424a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_289_o0424a_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_289_o0424a_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_289_o0424a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts 2+ days after 15 Re ascending and runs for almost 4 days. The second starts 1- days before 15 Re descending and runs for about 1 day. Some despinning may be required due to these outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit424_Contacts.txt,
for all contacts (4).
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 423 left us pointing in safe directions fore the orbit 424 arc A ascending and descending sequences:
ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018/10:17:03:29:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.936510,-0.317939,-0.147861
which is R.A. +198.752 Decl. -8.503
missing R.A. +201.716 Decl. -9.137 (ibex-sun)
error is R.A. +2.964 Decl. +0.634
for a total 2.997 deg
ibex_rotate -o -u -0.93651,-0.317939,-0.147861 -w ibex-sun -t 2018/10:20:23:59:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.936510,-0.317939,-0.147861
which is R.A. +198.752 Decl. -8.503
missing R.A. +205.222 Decl. -10.474 (ibex-sun)
error is R.A. +6.470 Decl. +1.971
for a total 6.678 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 +205.293 -d -10.500 -w ibex-sun -t 2018/10:21:01:47:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.888995,-0.420093,-0.182236
which is R.A. +205.293 Decl. -10.500
missing R.A. +205.293 Decl. -10.500 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +205.293 -d -10.500 -w ibex-sun -t 2018/10:21:03:17:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.888995,-0.420093,-0.182236
which is R.A. +205.293 Decl. -10.500
missing R.A. +205.352 Decl. -10.521 (ibex-sun)
error is R.A. +0.059 Decl. +0.021
for a total 0.062 deg
ibex_rotate -o -r +205.293 -d -10.500 -w ibex-sun -t 2018/10:24:23:46:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.888995,-0.420093,-0.182236
which is R.A. +205.293 Decl. -10.500
missing R.A. +209.125 Decl. -11.888 (ibex-sun)
error is R.A. +3.832 Decl. +1.388
for a total 4.007 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 425 apogee:
ibex_rotate -o -r +209.234 -d -11.931 -w ibex-sun -t 2018/10:25:02:22:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.853781,-0.477827,-0.206734
which is R.A. +209.234 Decl. -11.931
missing R.A. +209.234 Decl. -11.931 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +209.234 -d -11.931 -w ibex-sun -t 2018-10-29T23:22:18.959Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.853781,-0.477827,-0.206734
which is R.A. +209.234 Decl. -11.931
missing R.A. +213.804 Decl. -13.567 (ibex-sun)
error is R.A. +4.570 Decl. +1.636
for a total 4.748 deg
No Lo O-mode.
There is no overlap with orbit 423 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On October 5, 2018 at 10:54 AM "Perry, Timothy" <Timothy.Perry at OrbitalATK.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #424.
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 06 Oct 18.
>
>
>
> Note the Following:
>
> 1. Battery Balancing
>
> # Orbit# 424 PERIGEE Battery Balancing
>
> # 2018-10-25T11:18:36.065Z,Perigee,orbit:424
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2018/10:25:11:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2018/10:25:12:30:00
>
>
>
> 2. The second LAHO pass for Orbit# 423 is in the Orbit #424 ATS. The contact is at 17Re @10/17/18 05:00:00z.
>
>
>
> 3. IBEX_2018_289_o0424a_v001_.ccvr
>
> # IBEX_2018_289_o0424a_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 2018/10/17 01:45:44 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/10/21 02:47:29 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
> Timothy E. Perry
>
> CRS, IBEX, OCO-2 & TESS
>
> Mission Operations
>
> Tim.perry at ngc.com mailto:Tim.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
> Corp Cell (571) 447-8977
>
>
>
> [cid:image002.png at 01D43627.CCEBFFF0]
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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