[Isocops] IBEX Orbit #538 ATS Approval (18 – 27 Aug, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Fri Aug 6 15:47:40 EDT 2021
Hi all,
I have looked at the orbit 0538 ATS file, IBEX_2021_230_o0538a_v001.scr and I approve.
The constraint violations in IBEX_2021_230_o0538a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_230_o0538a_v001.scr match those in the STF, IBEX_2021_230_o0538a_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_230_o0538a_v001.oef and as verified with ibex_orbit.
There are 1 star tracker outages this orbit. Outage begins the day after perigee and lasts for ~30 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit538_Contacts.txt for all contacts (2).
No Battery Balancing this orbit
The Inertial maneuver at perigee of orbit 0537 left us pointing in safe directions for the orbit 0538 arc A ascending and descending sequences:
ibex_rotate -o -u -0.79994,0.554091,0.230389 -w ibex-sun -t 2021/08:18:21:31:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.799940,+0.554091,+0.230389
which is R.A. +145.291 Decl. +13.320
missing R.A. +148.105 Decl. +12.880 (ibex-sun)
error is R.A. +2.814 Decl. +0.440
for a total 2.776 deg
ibex_rotate -o -u -0.79994,0.554091,0.230389 -w ibex-sun -t 2021/08:22:10:58:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.799940,+0.554091,+0.230389
which is R.A. +145.291 Decl. +13.320
missing R.A. +151.312 Decl. +11.762 (ibex-sun)
error is R.A. +6.021 Decl. +1.558
for a total 6.080 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 -0.842062,0.498768,0.205333 -w ibex-sun -t 2021/08:22:12:41:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.842062,+0.498768,+0.205333
which is R.A. +149.361 Decl. +11.849
missing R.A. +151.379 Decl. +11.739 (ibex-sun)
error is R.A. +2.018 Decl. +0.110
for a total 1.978 deg
ibex_rotate -o -u -0.842062,0.498768,0.205333 -w ibex-sun -t 2021/08:22:14:17:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.842062,+0.498768,+0.205333
which is R.A. +149.361 Decl. +11.849
missing R.A. +151.440 Decl. +11.717 (ibex-sun)
error is R.A. +2.079 Decl. +0.132
for a total 2.040 deg
ibex_rotate -o -u -0.842062,0.498768,0.205333 -w ibex-sun -t 2021/08:27:00:10:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.842062,+0.498768,+0.205333
which is R.A. +149.361 Decl. +11.849
missing R.A. +155.614 Decl. +10.162 (ibex-sun)
error is R.A. +6.253 Decl. +1.687
for a total 6.365 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0539 apogee:
ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021/08:27:03:44:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.880372,+0.438650,+0.180365
which is R.A. +153.515 Decl. +10.391
missing R.A. +155.749 Decl. +10.103 (ibex-sun)
error is R.A. +2.234 Decl. +0.288
for a total 2.217 deg
ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021-08-31T22:16:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.880372,+0.438650,+0.180365
which is R.A. +153.515 Decl. +10.391
missing R.A. +159.968 Decl. +8.460 (ibex-sun)
error is R.A. +6.453 Decl. +1.931
for a total 6.652 deg
There is an overlap with orbit 537 commands with the end of the 537 contact overlapping with setting the science state in 538. This is acceptable.
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, 2021-August-4 at 12:14
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 #538 ATS Approval (18 – 27 Aug, 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 #538. Please respond to this thread with comments and approvals.
Approvals are required by COB 08 Aug 2021
Please note the following:
1. No Battery Balancing this orbit
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_230_o0538a_v001.ccvr
# Input files: 1
# IBEX_2021_230_o0538a_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 2021/08/18 18:52:20 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/08/22 13:47:02 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
==============
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 01D78ADA.623AE710]
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