[Isocops] IBEX Orbit #577 ATS Approval (6 – 15 Aug, 2022)

Wed Jul 27 13:17:16 EDT 2022

Hi all,
I have looked at the orbit 0577 ATS file, IBEX_2022_218_o0577a_v001.scr and I approve.

The constraint violations in IBEX_2022_218_o0577a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_218_o0577a_v001.scr match those in the STF, IBEX_2022_218_o0577a_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_2022_218_o0577a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. It lasts for ~27 hours and ends ~12 hours before the apogee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit577_Contacts.txt for all contacts (2).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0576 left us pointing in safe directions for the orbit 0577 arc A ascending and descending sequences:

ibex_rotate -o -u -0.664328,0.689303,0.289015 -w ibex-sun -t 2022/08:07:03:54:37
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.664328,+0.689303,+0.289015
which is     R.A. +133.943 Decl. +16.799
missing      R.A. +136.813 Decl. +16.505 (ibex-sun)
error is     R.A.   +2.870 Decl.  +0.294
for a total  2.765 deg

ibex_rotate -o -u -0.664328,0.689303,0.289015 -w ibex-sun -t 2022/08:10:18:56:55
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.664328,+0.689303,+0.289015
which is     R.A. +133.943 Decl. +16.799
missing      R.A. +140.174 Decl. +15.524 (ibex-sun)
error is     R.A.   +6.231 Decl.  +1.275
for a total  6.118 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 -0.71826,0.642266,0.267575 -w ibex-sun -t 2022/08:10:20:40:03
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.718260,+0.642266,+0.267575
which is     R.A. +138.197 Decl. +15.520
missing      R.A. +140.242 Decl. +15.504 (ibex-sun)
error is     R.A.   +2.045 Decl.  +0.016
for a total  1.971 deg

ibex_rotate -o -u -0.71826,0.642266,0.267575 -w ibex-sun -t 2022/08:10:22:15:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.718260,+0.642266,+0.267575
which is     R.A. +138.197 Decl. +15.520
missing      R.A. +140.306 Decl. +15.486 (ibex-sun)
error is     R.A.   +2.109 Decl.  +0.035
for a total  2.032 deg

ibex_rotate -o -u -0.71826,0.642266,0.267575 -w ibex-sun -t 2022/08:15:11:26:32
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.718260,+0.642266,+0.267575
which is     R.A. +138.197 Decl. +15.520
missing      R.A. +144.720 Decl. +14.068 (ibex-sun)
error is     R.A.   +6.523 Decl.  +1.452
for a total  6.471 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0578 apogee:

ibex_rotate -o -u -0.769676,0.589292,0.245629 -w ibex-sun -t 2022/08:15:15:29:21
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.769676,+0.589292,+0.245629
which is     R.A. +142.561 Decl. +14.219
missing      R.A. +144.876 Decl. +14.009 (ibex-sun)
error is     R.A.   +2.315 Decl.  +0.210
for a total  2.254 deg

ibex_rotate -o -u -0.769676,0.589292,0.245629 -w ibex-sun -t 2022-08-20T11:51:22
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.769676,+0.589292,+0.245629
which is     R.A. +142.561 Decl. +14.219
missing      R.A. +149.262 Decl. +12.508 (ibex-sun)
error is     R.A.   +6.701 Decl.  +1.711
for a total  6.740 deg

There is no overlap with orbit 0576 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: Monday, 2022-July-25 at 13:42
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, IBEX FDG Group <ADS-IBEX at l3harris.com>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, Ken Fairchild (kwfairchild at gmail.com) <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <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 #577 ATS Approval (6 – 15 Aug, 2022)
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 #577. Please respond to this thread with comments and approvals.
Approvals are required by COB, 27 July 2022

Please note the following:

  1.  No Battery Balancing this orbit
  2.

  3.  Command Load Constraint Violation Report (CCVR)

IBEX_2022_218_o0577a_v001.ccvr
#  Input files:         1
#   IBEX_2022_218_o0577a_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 2022/08/07 01:22:01 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/08/10 21:45:09 UTC

==============
OTHER MESSAGES
==============
NO MESSAGES

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