[Isocops] IBEX Orbit #540 ATS Approval (05 - 14 Sept, 2021)

Thu Aug 26 15:59:59 EDT 2021

Hi all,
I have looked at the orbit 0540 ATS file, IBEX_2021_248_o0540a_v001.scr and I approve.

The constraint violations in IBEX_2021_248_o0540a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_248_o0540a_v001.scr match those in the STF, IBEX_2021_248_o0540a_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_2021_248_o0540a_v001.oef and as verified with ibex_orbit.

No star tracker outage this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit540_Contacts.txt for all contacts (3).

We are doing battery balancing and it is appropriate distance from instrument macros and maneuvers.

The Inertial maneuver at perigee of orbit 0539 left us pointing in safe directions for the orbit 0540 arc A ascending and descending sequences:

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:05:20:24:14
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.942244,+0.310760,+0.124918
which is     R.A. +161.747 Decl.  +7.176
missing      R.A. +164.516 Decl.  +6.581 (ibex-sun)
error is     R.A.   +2.769 Decl.  +0.595
for a total  2.813 deg

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:09:10:01:44
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.942244,+0.310760,+0.124918
which is     R.A. +161.747 Decl.  +7.176
missing      R.A. +167.628 Decl.  +5.313 (ibex-sun)
error is     R.A.   +5.881 Decl.  +1.863
for a total  6.136 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 -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:09:11:44:52
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.964643,+0.245616,+0.095585
which is     R.A. +165.715 Decl.  +5.485
missing      R.A. +167.693 Decl.  +5.287 (ibex-sun)
error is     R.A.   +1.978 Decl.  +0.198
for a total  1.979 deg

ibex_rotate -o -u -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:09:13:19:58
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.964643,+0.245616,+0.095585
which is     R.A. +165.715 Decl.  +5.485
missing      R.A. +167.753 Decl.  +5.263 (ibex-sun)
error is     R.A.   +2.038 Decl.  +0.222
for a total  2.041 deg

ibex_rotate -o -u -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:13:22:16:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.964643,+0.245616,+0.095585
which is     R.A. +165.715 Decl.  +5.485
missing      R.A. +171.801 Decl.  +3.552 (ibex-sun)
error is     R.A.   +6.086 Decl.  +1.933
for a total  6.367 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0541 apogee:

 ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021/09:14:01:45:55
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.981700,+0.178104,+0.067406
which is     R.A. +169.717 Decl.  +3.865
missing      R.A. +171.934 Decl.  +3.489 (ibex-sun)
error is     R.A.   +2.217 Decl.  +0.376
for a total  2.244 deg

ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021-09-18T18:12:45
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.981700,+0.178104,+0.067406
which is     R.A. +169.717 Decl.  +3.865
missing      R.A. +176.011 Decl.  +1.740 (ibex-sun)
error is     R.A.   +6.29

There is no overlap with orbit 0539 commands.

Command Approval Checklist is attached.

Carol

--
Carol Weaver
University of New Hampshire
503.902.8492

From: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Date: Tuesday, 2021-August-24 at 16:58
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, IBEXOPS at gmail.com <IBEXOPS at gmail.com>, isocops at lists.sr.unh.edu <isocops at lists.sr.unh.edu>, fair-play at comcast.net <fair-play at comcast.net>, kwfairchild at gmail.com <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>
Subject: IBEX Orbit #540 ATS Approval (05 - 14 Sept, 2021)
CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe.

All,
   Attached are the planning files for Orbit #540. Please respond to this thread with comments and approvals.
Approvals are required by COB 26 Aug 2021

Please note the following:

  1.  Battery Balancing this orbit
Begin 09/14/2021 07:00:00– End 09/14/2021 08:30:00

  1.  Command Load Constraint Violation Report (CCVR)
IBEX_2021_248_o0540a_v001.ccvr
# Input files:         1
#   IBEX_2021_248_o0540a_v001.scr

==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.

==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2021/09/05 17:30:05 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2021/09/09 12:49:58 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

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