[Isocops] IBEX Orbit #469 ATS Approval ( 28 Nov - 8 Dec 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Tue Nov 19 15:36:58 EST 2019
All,
I have looked at the orbit 469 ATS,
IBEX_2019_332_o0469a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_332_o0469a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of two contacts; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2019_332_o0469a_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_332_o0469a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days after 15 Re ascending and runs for 1- 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_Orbit469_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 468 left us pointing in safe directions for the orbit 469 arc A ascending and descending sequences:
ibex_rotate -o -u -0.447194,-0.81702,-0.363999 -w ibex-sun -t 2019/11:29:04:10:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.447194,-0.817020,-0.363999
which is R.A. +241.306 Decl. -21.346
missing R.A. +244.527 Decl. -21.394 (ibex-sun)
error is R.A. +3.221 Decl. +0.048
for a total 3.000 deg
ibex_rotate -o -u -0.447194,-0.81702,-0.363999 -w ibex-sun -t 2019/12:02:21:22:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.447194,-0.817020,-0.363999
which is R.A. +241.306 Decl. -21.346
missing R.A. +248.446 Decl. -21.961 (ibex-sun)
error is R.A. +7.140 Decl. +0.615
for a total 6.664 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 -0.342625,-0.858056,-0.382554 -w ibex-sun -t 2019/12:02:23:05:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.342625,-0.858056,-0.382554
which is R.A. +248.233 Decl. -22.492
missing R.A. +248.522 Decl. -21.971 (ibex-sun)
error is R.A. +0.289 Decl. +0.521
for a total 0.586 deg
ibex_rotate -o -u -0.342625,-0.858056,-0.382554 -w ibex-sun -t 2019/12:03:00:40:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.342625,-0.858056,-0.382554
which is R.A. +248.233 Decl. -22.492
missing R.A. +248.593 Decl. -21.979 (ibex-sun)
error is R.A. +0.360 Decl. +0.513
for a total 0.611 deg
ibex_rotate -o -u -0.342625,-0.858056,-0.382554 -w ibex-sun -t 2019/12:07:14:16:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.342625,-0.858056,-0.382554
which is R.A. +248.233 Decl. -22.492
missing R.A. +253.602 Decl. -22.563 (ibex-sun)
error is R.A. +5.369 Decl. +0.071
for a total 4.960 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 470 apogee:
ibex_rotate -o -u -0.234192,-0.887887,-0.395994 -w ibex-sun -t 2019/12:07:17:48:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.234192,-0.887887,-0.395994
which is R.A. +255.224 Decl. -23.328
missing R.A. +253.773 Decl. -22.587 (ibex-sun)
error is R.A. +1.451 Decl. +0.741
for a total 1.528 deg
ibex_rotate -o -u -0.234192,-0.887887,-0.395994 -w ibex-sun -t 2019-12-12T17:02:23.426Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.234192,-0.887887,-0.395994
which is R.A. +255.224 Decl. -23.328
missing R.A. +259.182 Decl. -23.058 (ibex-sun)
error is R.A. +3.958 Decl. +0.270
for a total 3.648 deg
No Lo O-mode.
There is no overlap with orbit 468 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On November 15, 2019 at 2:52 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #469
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 18 Nov 2019
>
>
>
> Please note the following:
>
> 1. # Orbit 469 Battery Balancing
>
> # 2019-12-07T23:43:45.916Z,Perigee,orbit:469
>
> @ECT_SetLongEclipseFlag TRUE $TIME=2019/12:07:23:00:00
>
> @ECT_SetLongEclipseFlag FALSE $TIME=2019/12:08:00:30:00
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> The 2 IBX-CLC-006 Soft violations is because we have the 2 contacts that are separated by 4.5 hours. This should not be a problem.
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2019/12/07 11:58:00 UTC - 2019/12/07
>
> 13:02:00 UTC is followed 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 5880.000 seconds)
>
> IBX-CLC-006: Planned transmission at 2019/12/07 17:28:00 UTC - 2019/12/07
>
> 18:32:00 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 5880.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/11/29 01:40:15 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/12/03 00:10:29 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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