[Isocops] IBEX Orbit #550 ATS Approval (04 – 13 Dec, 2021)

Tue Nov 23 15:58:37 EST 2021

Hi all,

The angle at descending after the Apogee Sun Maneuver is 4.201 deg.
I have looked at the orbit 0550 ATS file, IBEX_2021_338_o0550a_v001.scr and I approve.

The constraint violations in IBEX_2021_338_o0550a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_338_o0550a_v001.scr match those in the STF, IBEX_2021_338_o0550a_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_338_o0550a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit lasting ~85 hours 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_Orbit550_Contacts.txt for all contacts (3).

No Battery Balancing this orbit

The inertial maneuver at perigee of orbit 0549 left us pointing in safe directions for the orbit 0550 arc A ascending and descending sequences:

ibex_rotate -o -u -0.320209,-0.865499,-0.385197 -w ibex-sun -t 2021/12:04:15:32:56
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.320209,-0.865499,-0.385197
which is     R.A. +249.697 Decl. -22.656
missing      R.A. +250.960 Decl. -22.303 (ibex-sun)
error is     R.A.   +1.263 Decl.  +0.353
for a total  1.219 deg

ibex_rotate -o -u -0.320209,-0.865499,-0.385197 -w ibex-sun -t 2021/12:08:17:00:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.320209,-0.865499,-0.385197
which is     R.A. +249.697 Decl. -22.656
missing      R.A. +255.357 Decl. -22.743 (ibex-sun)
error is     R.A.   +5.660 Decl.  +0.087
for a total  5.222 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 +255.438 -d -22.749 -w ibex-sun -t 2021/12:08:18:48:21
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.231868,-0.892583,-0.386695
which is     R.A. +255.438 Decl. -22.749
missing      R.A. +255.438 Decl. -22.749 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.000 deg

ibex_rotate -o -r +255.438 -d -22.749 -w ibex-sun -t 2021/12:08:20:18:27
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.231868,-0.892583,-0.386695
which is     R.A. +255.438 Decl. -22.749
missing      R.A. +255.505 Decl. -22.755 (ibex-sun)
error is     R.A.   +0.067 Decl.  +0.006
for a total  0.062 deg

ibex_rotate -o -r +255.438 -d -22.749 -w ibex-sun -t 2021/12:12:22:26:14
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.231868,-0.892583,-0.386695
which is     R.A. +255.438 Decl. -22.749
missing      R.A. +259.983 Decl. -23.103 (ibex-sun)
error is     R.A.   +4.545 Decl.  +0.354
for a total  4.201 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0551 apogee:

ibex_rotate -o -u -0.132337,-0.905367,-0.403481 -w ibex-sun -t 2021/12:13:01:44:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.132337,-0.905367,-0.403481
which is     R.A. +261.684 Decl. -23.796
missing      R.A. +260.143 Decl. -23.118 (ibex-sun)
error is     R.A.   +1.541 Decl.  +0.678
for a total  1.568 deg

ibex_rotate -o -u -0.132337,-0.905367,-0.403481 -w ibex-sun -t 2021-12-17T23:56:14
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.132337,-0.905367,-0.403481
which is     R.A. +261.684 Decl. -23.796
missing      R.A. +265.618 Decl. -23.362 (ibex-sun)
error is     R.A.   +3.934 Decl.  +0.434
for a total  3.631 deg

There is no overlap with orbit 0549 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, 2021-November-22 at 12:51
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 #550 ATS Approval (04 – 13 Dec, 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 #550. Please respond to this thread with comments and approvals.
Approvals are required by 16:00, 24 Nov 2021

Please note the following:

  1.  Apogee Sun Maneuver - 12/08/2021 18:33:21

  1.  No Battery Balancing this orbit

  1.  Command Load Constraint Violation Report (CCVR)
IBEX_2021_338_o0550a_v001.ccvr
# Input files:         1
#   IBEX_2021_338_o0550a_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 2021/12/04 13:08:31 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2021/12/08 19:48:27 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 01D7E082.F72227A0]

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