[Isocops] IBEX Orbit# 588 ATS Approval (16 Nov 22 - 25 Nov 22)

Fri Nov 4 11:45:51 EDT 2022

Hi all,

There is a moderate eclipse on 2022-11-25 that lasts for 1.2 hours. The long eclipse flag is set 2 hours before it begins and ends 15 minutes after it ends, per the requirements from Ryan Tyler.

I have looked at the orbit 0588 ATS file, IBEX_2022_320_o0588a_v001.scr and I approve.

The constraint violations in IBEX_2022_320_o0588a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and the battery charge falling below the minimum during the eclipse. The violations are acceptable.

The PL commands in IBEX_2022_320_o0588a_v001.scr match those in the STF, IBEX_2022_320_o0588a_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_320_o0588a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit.  It last for ~87 hours through apogee resulting in an apogee sun maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit588_Contacts_v002.txt for all contacts (3).

The Inertial maneuver at perigee of orbit 0587 left us pointing in safe directions for the orbit 0588 arc A ascending and descending sequences:

ibex_rotate -o -u -0.624991,-0.712615,-0.318695 -w ibex-sun -t 2022/11:16:22:34:58
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.624991,-0.712615,-0.318695
which is     R.A. +228.748 Decl. -18.584
missing      R.A. +231.893 Decl. -18.855 (ibex-sun)
error is     R.A.   +3.145 Decl.  +0.271
for a total  2.991 deg

ibex_rotate -o -u -0.624991,-0.712615,-0.318695 -w ibex-sun -t 2022/11:21:00:53:27
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.624991,-0.712615,-0.318695
which is     R.A. +228.748 Decl. -18.584
missing      R.A. +236.104 Decl. -19.777 (ibex-sun)
error is     R.A.   +7.356 Decl.  +1.193
for a total  7.048 deg

The Sun 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 -r +236.181 -d -19.793  -w ibex-sun -t 2022/11:21:02:41:35
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.523690,-0.781718,-0.338623
which is     R.A. +236.181 Decl. -19.793
missing      R.A. +236.181 Decl. -19.793 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.000 deg

ibex_rotate -o -r +236.181 -d -19.793  -w ibex-sun -t 2022/11:21:04:11:41
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.523690,-0.781718,-0.338623
which is     R.A. +236.181 Decl. -19.793
missing      R.A. +236.245 Decl. -19.806 (ibex-sun)
error is     R.A.   +0.064 Decl.  +0.013
for a total  0.062 deg

ibex_rotate -o -r +236.181 -d -19.793  -w ibex-sun -t 2022/11:25:04:19:21
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.523690,-0.781718,-0.338623
which is     R.A. +236.181 Decl. -19.793
missing      R.A. +240.460 Decl. -20.646 (ibex-sun)
error is     R.A.   +4.279 Decl.  +0.853
for a total  4.105 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0589 apogee:

ibex_rotate -o -u -0.491824,-0.795244,-0.354536 -w ibex-sun -t 2022/11:25:07:00:58
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.491824,-0.795244,-0.354536
which is     R.A. +238.265 Decl. -20.765
missing      R.A. +240.585 Decl. -20.674 (ibex-sun)
error is     R.A.   +2.320 Decl.  +0.091
for a total  2.172 deg

ibex_rotate -o -u -0.491824,-0.795244,-0.354536 -w ibex-sun -t 2022-11-30T03:55:31
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.491824,-0.795244,-0.354536
which is     R.A. +238.265 Decl. -20.765
missing      R.A. +245.804 Decl. -21.561 (ibex-sun)
error is     R.A.   +7.539 Decl.  +0.796
for a total  7.075 deg

There is no overlap with orbit 0587 commands.

Command Approval Checklist is attached.

Carol

--
Carol Weaver
University of New Hampshire
503.902.8492

From: Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Date: Wednesday, 2022-November-2 at 21:13
To: NIgel Angold <nangold at princeton.edu>
Cc: Ken Fairchild <kwfairchild at gmail.com>, Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, IBEXOPS (IBEXOPS at gmail.com) <ibexops at gmail.com>, ADS-IBEX <ads-ibex at l3harris.com>, ISOC <isocops at lists.sr.unh.edu>, Paul Janzen <Paul.Janzen at mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit# 588 ATS Approval (16 Nov 22 - 25 Nov 22)
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,
Please review the following for approval.
Approvals are required before 4 Nov 22 @4pm
Please note the following:

  1.  Moderate Eclipse (PERIGEE)
# 2022-11-25T13:25:33.303Z,EclipseEntry,moderate:true,long:false,orbit:588
# 2022-11-25T14:39:09.329Z,EclipseExit,moderate:true,long:false,orbit:588

SetLongEclipseFlag TRUE $TIME=2022/11:25:11:30:00
SetLongEclipseFlag FALSE $TIME=2022/11:25:14:55:00

  1.  Command Load Constraint Violation Report (CCVR)
   IBEX_2022_320_o0588a_v001.scr

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

==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-015: Battery charge falls below minimum from 2022/11/16 20:02:00 UTC -
             2022/11/26 00:32:00 UTC. Lowest charge level is 0.000000
             watt-minutes during this interval.
# 2022-11-25T13:25:33.303Z,EclipseEntry,moderate:true,long:false,orbit:588
# 2022-11-25T14:39:09.329Z,EclipseExit,moderate:true,long:false,orbit:588                 

IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/11/16 20:18:56 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2022/11/21 03:41:41 UTC

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

Best Regards,

Sheral Wesley  |  Sr Principal Engineer, Satellite Systems

Northrop Grumman Corporation  |  Space Systems

O: 703-406-5641  |  C: 202-236-0802  |  sheral.wesley at ngc.com<mailto:sheral.wesley at ngc.com>

 [cid:1a01dbb4-d80c-4ce9-9580-5f3e18ea4a39]

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