[Isocops] IBEX Orbit #531 ATS Approval (15 June 21 - 25 June 21)
Carol Weaver
Carol.Weaver at unh.edu
Fri Jun 4 17:33:22 EDT 2021
Hi all,
Sun angle at Apogee 532 is 4.551 deg.
I have looked at the orbit 0531 ATS file, IBEX_2021_166_o0531a_v001.scr and I approve.
The constraint violations in IBEX_2021_166_o0531a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_166_o0531a_v001.scr match those in the STF, IBEX_2021_166_o0531a_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_166_o0531a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. Outage lasts for ~27 hours over the perigee maneuver resulting in a sun precession maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit531_Contacts.txt for all contacts (3).
Battery Balancing this orbit is the right length and distance from other spacecraft activities.
The Inertial maneuver at perigee of orbit 0530 left us pointing in safe directions for the orbit 0531 arc A ascending and descending sequences:
ibex_rotate -o -u 0.131669,0.913039,0.386035 -w ibex-sun -t 2021/06:16:06:10:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.131669,+0.913039,+0.386035
which is R.A. +81.794 Decl. +22.708
missing R.A. +84.572 Decl. +23.324 (ibex-sun)
error is R.A. +2.778 Decl. +0.616
for a total 2.630 deg
ibex_rotate -o -u 0.131669,0.913039,0.386035 -w ibex-sun -t 2021/06:19:23:08:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.131669,+0.913039,+0.386035
which is R.A. +81.794 Decl. +22.708
missing R.A. +88.440 Decl. +23.435 (ibex-sun)
error is R.A. +6.646 Decl. +0.726
for a total 6.157 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 0.057425,0.919924,0.38787 -w ibex-sun -t 2021/06:20:00:39:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.057425,+0.919924,+0.387870
which is R.A. +86.428 Decl. +22.822
missing R.A. +88.507 Decl. +23.436 (ibex-sun)
error is R.A. +2.079 Decl. +0.614
for a total 2.008 deg
ibex_rotate -o -u 0.057425,0.919924,0.38787 -w ibex-sun -t 2021/06:20:02:26:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.057425,+0.919924,+0.387870
which is R.A. +86.428 Decl. +22.822
missing R.A. +88.586 Decl. +23.438 (ibex-sun)
error is R.A. +2.158 Decl. +0.616
for a total 2.078 deg
ibex_rotate -o -u 0.057425,0.919924,0.38787 -w ibex-sun -t 2021/06:24:14:12:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.057425,+0.919924,+0.387870
which is R.A. +86.428 Decl. +22.822
missing R.A. +93.295 Decl. +23.416 (ibex-sun)
error is R.A. +6.867 Decl. +0.594
for a total 6.343 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0530 apogee:
ibex_rotate -o -r +93.436 -d +23.407 -w ibex-sun -t 2021/06:24:17:38:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.055001,+0.916056,+0.397260
which is R.A. +93.436 Decl. +23.407
missing R.A. +93.436 Decl. +23.407 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +93.436 -d +23.407 -w ibex-sun -t 2021-06-29T13:13:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.055001,+0.916056,+0.397260
which is R.A. +93.436 Decl. +23.407
missing R.A. +98.388 Decl. +23.225 (ibex-sun)
error is R.A. +4.952 Decl. +0.182
for a total 4.551 deg
There is no overlap with orbit 0530 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, 2021-June-2 at 21:14
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>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>
Subject: IBEX Orbit #531 ATS Approval (15 June 21 - 25 June 21)
Caution - External Email
All,
Attached are the planning files for Orbit #531. Please respond to this thread with comments and approvals.
We will manually reset the master timer at PERIGEE starting with Orbit# 531.
Approvals are required by COB on 5 June 2021.
Please note the following:
1. The ATS file has been changed to a word file and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.
2. PERIGEE Sun Maneuver
2021-06-24T17:23:27.000Z,SunMvrBegin
2021-06-24T17:38:27.000Z,SunMvrEnd
3. Battery Balancing this orbit
Orbit# 531 PERIGEE Battery Balancing Commands
# 2021-06-25T00:00:13.964Z,Perigee,orbit:531
SetLongEclipseFlag TRUE $TIME=2021/06:25:01:00:00
SetLongEclipseFlag FALSE $TIME=2021/06:25:02:30:00
4. Command Load Constraint Violation Report (CCVR)
# Filename: IBEX_2021_166_o0531a_v001.ccvr
# File type: Command Load Constraint Violation Report (CCVR)
#
# Create time: 2021/153.204146
# Plan period start: 2021/167.031800
# Plan period stop: 2021/176.071200
# Default time format: UTC
#
# Input files: 1
# IBEX_2021_166_o0531a_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 2021/06/16 03:20:29 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/06/20 01:56:43 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
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>
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