[Isocops] IBEX Orbit #461 ATS Approval ( 17 - 26 Sept 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Fri Sep 6 12:12:32 EDT 2019
All,
I have looked at the orbit 461 ATS,
IBEX_2019_260_o0461a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_260_o0461a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of the perigee contacts; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2019_260_o0461a_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_260_o0461a_v001.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_Orbit461_Contacts.txt,
for all contacts (4).
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The sun precession maneuver at perigee of orbit 460 left us pointing in safe directions for the orbit 461 arc A ascending and descending sequences:
ibex_rotate -o -r +173.921 -d +2.643 -w ibex-sun -t 2019/09:17:12:07:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993319,+0.105787,+0.046113
which is R.A. +173.921 Decl. +2.643
missing R.A. +174.536 Decl. +2.341 (ibex-sun)
error is R.A. +0.615 Decl. +0.302
for a total 0.685 deg
ibex_rotate -o -r +173.921 -d +2.643 -w ibex-sun -t 2019/09:21:03:14:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993319,+0.105787,+0.046113
which is R.A. +173.921 Decl. +2.643
missing R.A. +177.693 Decl. +0.998 (ibex-sun)
error is R.A. +3.772 Decl. +1.645
for a total 4.114 deg
The inertial 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 -0.997063,0.073675,0.020908 -w ibex-sun -t 2019/09:21:04:56:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.997063,+0.073675,+0.020908
which is R.A. +175.774 Decl. +1.198
missing R.A. +177.757 Decl. +0.971 (ibex-sun)
error is R.A. +1.983 Decl. +0.227
for a total 1.996 deg
ibex_rotate -o -u -0.997063,0.073675,0.020908 -w ibex-sun -t 2019/09:21:06:32:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.997063,+0.073675,+0.020908
which is R.A. +175.774 Decl. +1.198
missing R.A. +177.818 Decl. +0.946 (ibex-sun)
error is R.A. +2.044 Decl. +0.252
for a total 2.059 deg
ibex_rotate -o -u -0.997063,0.073675,0.020908 -w ibex-sun -t 2019/09:25:17:14:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.997063,+0.073675,+0.020908
which is R.A. +175.774 Decl. +1.198
missing R.A. +181.937 Decl. -0.819 (ibex-sun)
error is R.A. +6.163 Decl. +2.017
for a total 6.485 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 462 apogee:
ibex_rotate -o -u -0.999958,0.002129,-0.008919 -w ibex-sun -t 2019/09:25:20:15:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999958,+0.002129,-0.008919
which is R.A. +179.878 Decl. -0.511
missing R.A. +182.052 Decl. -0.874 (ibex-sun)
error is R.A. +2.174 Decl. +0.363
for a total 2.204 deg
ibex_rotate -o -u -0.999958,0.002129,-0.008919 -w ibex-sun -t 2019-09-30T14:19:18.321Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999958,+0.002129,-0.008919
which is R.A. +179.878 Decl. -0.511
missing R.A. +186.209 Decl. -2.678 (ibex-sun)
error is R.A. +6.331 Decl. +2.166
for a total 6.688 deg
No Lo O-mode.
There is no overlap wth orbit 460 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On September 4, 2019 at 10:05 AM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #461
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 6 Sept 2019.
>
>
> Please note the following:
>
> 1. No Battery Balancing this orbit
>
>
>
> 2. We have 2 IBX-CLC-006 soft Constraint Error’s with this ATS. These errors are acceptable. On 09/16 we have 2 60 minute contacts planned that are separated by 2 hours. The limit for MPS is 90 minutes for a 5 hour period. The 2 hour period between contacts will allow the transmitter to cool down.
>
> IBEX,AUWA01,ADD,09/25/19,268,15:00:00,09/25/19,268,16:00:00,,LAHO 160K IBEX-2 Orbit# 461 Hi BG Test End
>
> IBEX,USHI01,ADD,09/25/19,268,18:00:00,09/25/19,268,19:00:00,,LAHO 160K IBEX-2 Orbit# 461 SSR_Dump/Tracking Contact
>
>
>
> 3. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2019_260_o0461a_v001.ccvr
>
> # Input files: 1
>
> # IBEX_2019_260_o0461a_v001.scr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2019/09/25 14:58:00 UTC - 2019/09/25
>
> 16:02:00 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 7680.000 seconds)
>
> IBX-CLC-006: Planned transmission at 2019/09/25 17:58:00 UTC - 2019/09/25
>
> 19:02:00 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 7680.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/09/17 09:46:50 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/09/21 06:02:29 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> tim.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
>
>
>
>
> ---------------------------------------------
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> Thank you.
> *********************
>
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