[Isocops] IBEX Orbit #575 ATS Approval (19 – 28 July 2022)

Wed Jul 6 17:29:06 EDT 2022

With attachment.

--
Carol Weaver
University of New Hampshire
503.902.8492

From: Carol Weaver <Carol.Weaver at unh.edu>
Date: Wednesday, 2022-July-6 at 17:28
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, 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>, 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: Re: IBEX Orbit #575 ATS Approval (19 – 28 July 2022)
Hi all,
I have looked at the orbit 0575 ATS file, IBEX_2022_200_o0575a_v001.scr and I approve.

The constraint violations in IBEX_2022_200_o0575a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_200_o0575a_v001.scr match those in the STF, IBEX_2022_200_o0575a_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_200_o0575a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit lasting ~3 hours around perigee.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit575_Contacts.txt for all contacts (3).

Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 15 minutes away from a maneuver.

The Inertial maneuver at perigee of orbit 0574 left us pointing in safe directions for the orbit 0575 arc A ascending and descending sequences:

ibex_rotate -o -u -0.411305,0.839839,0.354258 -w ibex-sun -t 2022/07:20:00:13:51
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.411305,+0.839839,+0.354258
which is     R.A. +116.093 Decl. +20.748
missing      R.A. +119.024 Decl. +20.740 (ibex-sun)
error is     R.A.   +2.931 Decl.  +0.008
for a total  2.741 deg

ibex_rotate -o -u -0.411305,0.839839,0.354258 -w ibex-sun -t 2022/07:23:16:09:57
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.411305,+0.839839,+0.354258
which is     R.A. +116.093 Decl. +20.748
missing      R.A. +122.610 Decl. +20.068 (ibex-sun)
error is     R.A.   +6.517 Decl.  +0.680
for a total  6.145 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 -0.478457,0.809574,0.340101 -w ibex-sun -t 2022/07:23:17:53:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.478457,+0.809574,+0.340101
which is     R.A. +120.583 Decl. +19.883
missing      R.A. +122.682 Decl. +20.054 (ibex-sun)
error is     R.A.   +2.099 Decl.  +0.171
for a total  1.980 deg

ibex_rotate -o -u -0.478457,0.809574,0.340101 -w ibex-sun -t 2022/07:23:19:28:11
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.478457,+0.809574,+0.340101
which is     R.A. +120.583 Decl. +19.883
missing      R.A. +122.748 Decl. +20.041 (ibex-sun)
error is     R.A.   +2.165 Decl.  +0.158
for a total  2.041 deg
 ibex_rotate -o -u -0.478457,0.809574,0.340101 -w ibex-sun -t 2022/07:28:07:35:25
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.478457,+0.809574,+0.340101
which is     R.A. +120.583 Decl. +19.883
missing      R.A. +127.316 Decl. +19.037 (ibex-sun)
error is     R.A.   +6.733 Decl.  +0.846
for a total  6.404 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0576 apogee:

ibex_rotate -o -u -0.544948,0.772828,0.325222 -w ibex-sun -t 2022/07:28:10:43:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.544948,+0.772828,+0.325222
which is     R.A. +125.189 Decl. +18.979
missing      R.A. +127.441 Decl. +19.002 (ibex-sun)
error is     R.A.   +2.252 Decl.  +0.023
for a total  2.130 deg

ibex_rotate -o -u -0.544948,0.772828,0.325222 -w ibex-sun -t 2022-08-02T05:39:41
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.544948,+0.772828,+0.325222
which is     R.A. +125.189 Decl. +18.979
missing      R.A. +131.993 Decl. +17.873 (ibex-sun)
error is     R.A.   +6.804 Decl.  +1.106
for a total  6.548 deg

There is no overlap with orbit 0574 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: Wednesday, 2022-July-6 at 13:30
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 #575 ATS Approval (19 – 28 July 2022)
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All,
   Attached are the planning files for Orbit #575. Please respond to this thread with comments and approvals.
Approvals are required by COB, 09 July 2022

Please note the following:

  1.  Battery Balancing this orbit
  2.  Begin 2022/07/28 17:00:00– End 2022/07/28 18:30:00

  1.  Command Load Constraint Violation Report (CCVR)

IBEX_2022_200_o0575a_v001.ccvr
# Input files:         1
#   IBEX_2022_200_o0575a_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 2022/07/19 21:53:52 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/07/23 18:58:11 UTC

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

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