[Isocops] IBEX Orbit #534 ATS Approval (13 - 22 July, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Fri Jul 2 12:52:47 EDT 2021
Hi all,
I have looked at the orbit 0534 ATS file, IBEX_2021_194_o0534a_v001.scr and I approve.
The constraint violations in IBEX_2021_194_o0534a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_194_o0534a_v001.scr match those in the STF, IBEX_2021_194_o0534a_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_194_o0534a_v001.oef and as verified with ibex_orbit.
There are 1 star tracker outage this orbit. Outage begins after the perigee maneuver and lasts for ~7 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit534_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long and placed appropriately from the maneuver and instrument commands.
The Inertial maneuver at perigee of orbit 0533 left us pointing in safe directions for the orbit 0534 arc A ascending and descending sequences:
ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021/07:13:18:10:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.319271,+0.873015,+0.368660
which is R.A. +110.088 Decl. +21.633
missing R.A. +112.970 Decl. +21.739 (ibex-sun)
error is R.A. +2.882 Decl. +0.106
for a total 2.680 deg
ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021/07:17:09:37:03
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.319271,+0.873015,+0.368660
which is R.A. +110.088 Decl. +21.633
missing R.A. +116.615 Decl. +21.191 (ibex-sun)
error is R.A. +6.527 Decl. +0.442
for a total 6.092 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 -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:17:11:20:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.388321,+0.849420,+0.357341
which is R.A. +114.568 Decl. +20.937
missing R.A. +116.689 Decl. +21.180 (ibex-sun)
error is R.A. +2.121 Decl. +0.243
for a total 1.994 deg
ibex_rotate -o -u -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:17:12:55:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.388321,+0.849420,+0.357341
which is R.A. +114.568 Decl. +20.937
missing R.A. +116.757 Decl. +21.170 (ibex-sun)
error is R.A. +2.189 Decl. +0.233
for a total 2.056 deg
ibex_rotate -o -u -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:21:23:39:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.388321,+0.849420,+0.357341
which is R.A. +114.568 Decl. +20.937
missing R.A. +121.304 Decl. +20.339 (ibex-sun)
error is R.A. +6.736 Decl. +0.598
for a total 6.332 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0535 apogee:
ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021/07:22:02:56:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.457592,+0.819336,+0.345396
which is R.A. +119.183 Decl. +20.206
missing R.A. +121.435 Decl. +20.307 (ibex-sun)
error is R.A. +2.252 Decl. +0.101
for a total 2.115 deg
ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021-07-26T21:26:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.457592,+0.819336,+0.345396
which is R.A. +119.183 Decl. +20.206
missing R.A. +126.062 Decl. +19.326 (ibex-sun)
error is R.A. +6.879 Decl. +0.880
for a total 6.533 deg
There is no overlap with orbit 0533 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: Thursday, 2021-July-1 at 09:21
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 #534 ATS Approval (13 - 22 July, 2021)
Caution - External Email
All,
Attached are the planning files for Orbit #534. Please respond to this thread with comments and approvals.
Approvals are required by COB on 02 July 2021
Please note the following:
1. Battery Balancing this orbit
Begin 2021/07:22:09:00:00– End 2021/07:22:10:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_194_o0534a_v001.ccvr
# Input files: 1
# IBEX_2021_194_o0534a_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 2021/07/13 15:29:15 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/07/17 12:25:17 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 01D76F41.275ECA80]
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