[Isocops] IBEX Orbit #481 ATS Approval ( 18 - 27 Mar 2020 ) - v002 approval
KEN FAIRCHILD
fair-play at comcast.net
Wed Mar 11 12:30:48 EDT 2020
All,
I have looked at the orbit 481 ATS,
IBEX_2020_078_o0481a_v002.scr ,
and I approve.
The only constraint violations in
IBEX_2020_078_o0481a_v002_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity and timing of two contacts; the violations are expected.
The PL commands in the v002 ATS match those in the v002 STF,
IBEX_2020_078_o0481a_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_2020_078_o0481a_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_Orbit481_Contacts_v2.txt ,
for all contacts (3).
We're not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 480 left us pointing in safe directions for the orbit 481 arc A ascending and descending sequences:
ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020/03:18:18:22:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.997014,-0.066798,-0.038754
which is R.A. +356.167 Decl. -2.221
missing R.A. +358.475 Decl. -0.684 (ibex-sun)
error is R.A. +2.308 Decl. +1.537
for a total 2.772 deg
ibex_rotate -o -u 0.997014,-0.066798,-0.038754 -w ibex-sun -t 2020/03:22:07:24:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.997014,-0.066798,-0.038754
which is R.A. +356.167 Decl. -2.221
missing R.A. +1.805 Decl. +0.784 (ibex-sun)
error is R.A. +354.362 Decl. +3.005
for a total 6.388 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 0.999949,0.004433,-0.009076 -w ibex-sun -t 2020/03:22:09:07:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999949,+0.004433,-0.009076
which is R.A. +0.254 Decl. -0.520
missing R.A. +1.870 Decl. +0.813 (ibex-sun)
error is R.A. +1.616 Decl. +1.333
for a total 2.095 deg
ibex_rotate -o -u 0.999949,0.004433,-0.009076 -w ibex-sun -t 2020/03:22:10:42:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999949,+0.004433,-0.009076
which is R.A. +0.254 Decl. -0.520
missing R.A. +1.930 Decl. +0.840 (ibex-sun)
error is R.A. +1.676 Decl. +1.360
for a total 2.159 deg
ibex_rotate -o -u 0.999949,0.004433,-0.009076 -w ibex-sun -t 2020/03:26:19:57:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999949,+0.004433,-0.009076
which is R.A. +0.254 Decl. -0.520
missing R.A. +5.797 Decl. +2.525 (ibex-sun)
error is R.A. +5.543 Decl. +3.045
for a total 6.323 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 482 apogee:
ibex_rotate -o -u 0.996947,0.074733,0.0226 -w ibex-sun -t 2020/03:26:23:21:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.996947,+0.074733,+0.022600
which is R.A. +4.287 Decl. +1.295
missing R.A. +5.924 Decl. +2.573 (ibex-sun)
error is R.A. +1.637 Decl. +1.278
for a total 2.076 deg
ibex_rotate -o -u 0.996947,0.074733,0.0226 -w ibex-sun -t 2020-03-31T18:21:38.369Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.996947,+0.074733,+0.022600
which is R.A. +4.287 Decl. +1.295
missing R.A.+10.414 Decl. +4.490 (ibex-sun)
error is R.A. +6.127 Decl. +3.195
for a total 6.903 deg
No Lo O-mode.
There is no overlap with orbit 480 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On March 6, 2020 at 11:55 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #481
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 8 Mar 2020
>
>
>
> Please note the following:
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2020_078_o0481a_v001_.ccvr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> These 2 IBX-CLC-006 soft violations are acceptable. The 2 contacts are as follows:
>
> USAK01,03/18/20,078,15:00:00,03/18/20,078,16:00:00, 160K IBEX-3 Orbit# 480 SSR_Dump/Tracking Contact 14re Asc
>
> USAK01,03/18/20,078,19:00:00,03/18/20,078,20:00:00, 40K IBEX-3 Orbit# 481 HI BK Grnd Test 15.5re Asc Begin
>
> The is a 3 hour gap between the 2 contacts. This will give the transmitters plenty of time to cool down. Also, the transmitter temp is a point that we routinely monitor.
>
>
>
> IBX-CLC-006: Planned transmission at 2020/03/18 15:50:00 UTC - 2020/03/18
>
> 18:58:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> IBX-CLC-006: Planned transmission at 2020/03/18 18:58:00 UTC - 2020/03/18
>
> 20:02:00 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 15120.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/03/18 15:53:09 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/03/22 10:12:29 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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