[Isocops] IBEX Orbit #430 ATS Approval ( 09 Dec - 18 Dec ) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Nov 28 15:41:10 EST 2018
All,
I have looked at the orbit 430 ATS,
IBEX_2018_343_o0430a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_343_o0430a_v001_.ccvr
are from the length and proximity of two contacts and 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_343_o0430a_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_343_o0430a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 36 hours after 15 Re ascending and runs for 2+ days. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit430_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 429 left us pointing in safe directions for the orbit 430 arc A ascending and descending sequences:
ibex_rotate -o -u -0.211893,-0.892545,-0.398077 -w ibex-sun -t 2018/12:09:12:27:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.211893,-0.892545,-0.398077
which is R.A. +256.645 Decl. -23.458
missing R.A. +256.033 Decl. -22.841 (ibex-sun)
error is R.A. +0.612 Decl. +0.617
for a total 0.835 deg
ibex_rotate -o -u -0.211893,-0.892545,-0.398077 -w ibex-sun -t 2018/12:13:13:52:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.211893,-0.892545,-0.398077
which is R.A. +256.645 Decl. -23.458
missing R.A. +260.416 Decl. -23.149 (ibex-sun)
error is R.A. +3.771 Decl. +0.309
for a total 3.477 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 -0.135262,-0.905276,-0.402715 -w ibex-sun -t 2018/12:13:15:34:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.135262,-0.905276,-0.402715
which is R.A. +261.502 Decl. -23.748
missing R.A. +260.493 Decl. -23.153 (ibex-sun)
error is R.A. +1.009 Decl. +0.595
for a total 1.100 deg
ibex_rotate -o -u -0.135262,-0.905276,-0.402715 -w ibex-sun -t 2018/12:13:17:10:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.135262,-0.905276,-0.402715
which is R.A. +261.502 Decl. -23.748
missing R.A. +260.566 Decl. -23.156 (ibex-sun)
error is R.A. +0.936 Decl. +0.592
for a total 1.043 deg
ibex_rotate -o -u -0.135262,-0.905276,-0.402715 -w ibex-sun -t 2018/12:17:12:35:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.135262,-0.905276,-0.402715
which is R.A. +261.502 Decl. -23.748
missing R.A. +264.810 Decl. -23.326 (ibex-sun)
error is R.A. +3.308 Decl. +0.422
for a total 3.062 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 431 apogee:
ibex_rotate -o -u -0.054073,-0.912036,-0.406529 -w ibex-sun -t 2018/12:17:15:02:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.054073,-0.912036,-0.406529
which is R.A. +266.607 Decl. -23.987
missing R.A. +264.929 Decl. -23.333 (ibex-sun)
error is R.A. +1.678 Decl. +0.654
for a total 1.670 deg
ibex_rotate -o -u -0.054073,-0.912036,-0.406529 -w ibex-sun -t 2018-12-22T14:15:12.976Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.054073,-0.912036,-0.406529
which is R.A. +266.607 Decl. -23.987
missing R.A. +270.421 Decl. -23.441 (ibex-sun)
error is R.A. +3.814 Decl. +0.546
for a total 3.534 deg
No Lo O-mode.
There is no overlap with orbit 429 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On November 26, 2018 at 6:20 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #430.
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB 28 Nov 18.
>
>
>
> Note the Following:
>
> 1. Battery Balancing
>
> Please note that the battery balancing is normally performed around perigee. This time since we will be doing the star tracker image dump close to perigee. The battery balancing will be done between the first and second perigee contacts.
>
> # 2018-12-18T00:09:07.036Z,Perigee,orbit:430
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2018/12:17:20:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2018/12:17:21:30:00
>
>
>
> 2. IBEX_2018_343_o0430a_v001_.ccvr
>
> The 2 IBX-CLC-006 errors are because of the 2 perigee contacts that are close to each other. This is an acceptable error message.
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2018/12/18 04:28:00 UTC - 2018/12/18
>
> 06:02:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> IBX-CLC-006: Planned transmission at 2018/12/18 07:58:00 UTC - 2018/12/18
>
> 09:02:00 UTC is preceded by one or more additional transmissions
>
> which, when combined, exceed the maximum transmission time of 5400
>
> seconds within a 18000-second window (total planned transmission
>
> time this window is 9480.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/12/09 10:50:45 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/12/13 16:40:31 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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