[Isocops] IBEX Orbit #470 ATS Approval ( 8 - 17 Dec 2019 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Wed Nov 27 23:23:34 EST 2019
All,
I have looked at the orbit 470 ATS,
IBEX_2019_341_o0470a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_341_o0470a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the length of a contact; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2019_341_o0470a_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_341_o0470a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1.5+ days after 15 Re ascending and runs for 3+ 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_Orbit470_Contacts.txt,
for all contacts (3).
We are not doing battery cell balancing this orbit, we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 469 left us pointing in safe directions for the orbit 470 arc A ascending and descending sequences:
ibex_rotate -o -u -0.234192,-0.887887,-0.395994 -w ibex-sun -t 2019/12:08:09:08:27
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. +254.505 Decl. -22.692 (ibex-sun)
error is R.A. +0.719 Decl. +0.636
for a total 0.918 deg
ibex_rotate -o -u -0.234192,-0.887887,-0.395994 -w ibex-sun -t 2019/12:13:09:16:27
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. +259.916 Decl. -23.096 (ibex-sun)
error is R.A. +4.692 Decl. +0.232
for a total 4.318 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 -0.153733,-0.902885,-0.401452 -w ibex-sun -t 2019/12:13:10:59:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.153733,-0.902886,-0.401452
which is R.A. +260.337 Decl. -23.669
missing R.A. +259.994 Decl. -23.100 (ibex-sun)
error is R.A. +0.343 Decl. +0.569
for a total 0.650 deg
ibex_rotate -o -u -0.153733,-0.902885,-0.401452 -w ibex-sun -t 2019/12:13:12:34:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.153733,-0.902886,-0.401452
which is R.A. +260.337 Decl. -23.669
missing R.A. +260.066 Decl. -23.104 (ibex-sun)
error is R.A. +0.271 Decl. +0.565
for a total 0.618 deg
ibex_rotate -o -u -0.153733,-0.902885,-0.401452 -w ibex-sun -t 2019/12:16:23:50:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.153733,-0.902886,-0.401452
which is R.A. +260.337 Decl. -23.669
missing R.A. +263.937 Decl. -23.301 (ibex-sun)
error is R.A. +3.600 Decl. +0.368
for a total 3.322 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 471 apogee:
ibex_rotate -o -u -0.069298,-0.911205,-0.406083 -w ibex-sun -t 2019/12:17:03:03:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.069298,-0.911205,-0.406083
which is R.A. +265.651 Decl. -23.959
missing R.A. +264.095 Decl. -23.313 (ibex-sun)
error is R.A. +1.556 Decl. +0.646
for a total 1.565 deg
ibex_rotate -o -u -0.069298,-0.911205,-0.406083 -w ibex-sun -t 2019-12-22T00:24:00.806Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.069298,-0.911205,-0.406083
which is R.A. +265.651 Decl. -23.959
missing R.A. +269.500 Decl. -23.429 (ibex-sun)
error is R.A. +3.849 Decl. +0.530
for a total 3.564 deg
No Lo O-mode.
There is no overlap with orbit 469 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, 2019 at 11:27 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #470
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 27 Nov 2019
>
>
>
> Please note the following:
>
> 1. No Battery Balancing
>
>
>
> 2. Star Tracker Image Dump
>
> · USHI01 12/17/19,351,12:00:00 - 12/17/19,351,13:30:00,LAHO 160K IBEX-2 Orbit# 470 Star Tracker Image Dump
>
>
>
> 3. Command Load Constraint Violation Report (CCVR)
>
> IBX-CLC-006 Violation is acceptable. The time between supports is 6 hours. There should be no issue with transmitter temp.
>
>
>
> IBEX_2019_341_o0470a_v001.ccvr
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2019/12/17 11:58:00 UTC - 2019/12/17
>
> 13:32:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/12/08 06:22:46 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/12/13 12:04:41 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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