[Isocops] IBEX Orbit #548 ATS Approval (16 - 25 Nov, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Thu Nov 4 13:55:48 EDT 2021
Hi all,
I have looked at the orbit 0548 ATS file, IBEX_2021_319_o0548a_v001.scr and I approve.
The constraint violations in IBEX_2021_319_o0548a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_319_o0548a_v001.scr match those in the STF, IBEX_2021_319_o0548a_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_319_o0548a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. It lasts for 68.4 hours and overlaps with the beginning of the apogee maneuver window start. It ends 9.3 hours from the inertial maneuver giving the star tracker time to recover from the outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit548_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 1 hour away from maneuver.
The inertial maneuver at perigee of orbit 0547 left us pointing in safe directions for the orbit 0548 arc A ascending and descending sequences:
ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021/11:16:09:42:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.628645,-0.709905,-0.317553
which is R.A. +228.474 Decl. -18.515
missing R.A. +231.607 Decl. -18.786 (ibex-sun)
error is R.A. +3.133 Decl. +0.271
for a total 2.981 deg
ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021/11:20:15:30:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.628645,-0.709905,-0.317553
which is R.A. +228.474 Decl. -18.515
missing R.A. +235.940 Decl. -19.742 (ibex-sun)
error is R.A. +7.466 Decl. +1.227
for a total 7.159 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 -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:20:17:14:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.562433,-0.754589,-0.338032
which is R.A. +233.301 Decl. -19.757
missing R.A. +236.014 Decl. -19.757 (ibex-sun)
error is R.A. +2.713 Decl. +0.000
for a total 2.553 deg
ibex_rotate -o -u -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:20:18:48:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.562433,-0.754589,-0.338032
which is R.A. +233.301 Decl. -19.757
missing R.A. +236.081 Decl. -19.771 (ibex-sun)
error is R.A. +2.780 Decl. +0.014
for a total 2.617 deg
ibex_rotate -o -u -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:24:18:01:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.562433,-0.754589,-0.338032
which is R.A. +233.301 Decl. -19.757
missing R.A. +240.284 Decl. -20.614 (ibex-sun)
error is R.A. +6.983 Decl. +0.857
for a total 6.609 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0549 apogee:
ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021/11:24:21:06:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.495239,-0.793472,-0.353752
which is R.A. +238.030 Decl. -20.717
missing R.A. +240.428 Decl. -20.647 (ibex-sun)
error is R.A. +2.398 Decl. +0.070
for a total 2.244 deg
ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021-11-29T16:54:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.495239,-0.793472,-0.353752
which is R.A. +238.030 Decl. -20.717
missing R.A. +245.560 Decl. -21.524 (ibex-sun)
error is R.A. +7.530 Decl. +0.807
for a total 7.069 deg
There is an overlap with orbit 0547 commands for the last contact in the previous ATS. 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: Tuesday, 2021-November-2 at 17:50
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 #548 ATS Approval (16 - 25 Nov, 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 #548. Please respond to this thread with comments and approvals.
Approvals are required by COB, 05 Nov 2021
Please note the following:
1. Battery Balancing this orbit
Begin 2021/11/25 04:00:00 – End 2021/11/25 05:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_319_o0548a_v001.ccvr
# Input files: 1
# IBEX_2021_319_o0548a_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 2021/11/16 07:08:58 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/11/20 18:18:36 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 01D7D183.AAD66FE0]
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