[Isocops] IBEX Orbit #535 ATS Approval (22 - 31 July, 2021)

Fri Jul 9 12:05:19 EDT 2021

Hi all,
I have looked at the orbit 0535 ATS file, IBEX_2021_203_o0535a_v001.scr and I approve.

The constraint violations in IBEX_2021_203_o0535a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_203_o0535a_v001.scr match those in the STF, IBEX_2021_203_o0535a_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_203_o0535a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins 9 hours after the perigee maneuver and lasts for ~4.5 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit535_Contacts.txt for all contacts (3).

No Battery Balancing this orbit

The Inertial maneuver at perigee of orbit 0534 left us pointing in safe directions for the orbit 0535 arc A ascending and descending sequences:

ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021/07:22:19:28:01
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. +122.068 Decl. +20.151 (ibex-sun)
error is     R.A.   +2.885 Decl.  +0.055
for a total  2.708 deg

ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021/07:26:09:56:04
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. +125.580 Decl. +19.427 (ibex-sun)
error is     R.A.   +6.397 Decl.  +0.779
for a total  6.068 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 -0.521706,0.78666,0.330136 -w ibex-sun -t 2021/07:26:11:39:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.521706,+0.786660,+0.330136
which is     R.A. +123.552 Decl. +19.277
missing      R.A. +125.652 Decl. +19.412 (ibex-sun)
error is     R.A.   +2.100 Decl.  +0.135
for a total  1.986 deg

ibex_rotate -o -u -0.521706,0.78666,0.330136 -w ibex-sun -t 2021/07:26:13:14:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.521706,+0.786660,+0.330136
which is     R.A. +123.552 Decl. +19.277
missing      R.A. +125.718 Decl. +19.398 (ibex-sun)
error is     R.A.   +2.166 Decl.  +0.121
for a total  2.048 deg

ibex_rotate -o -u -0.521706,0.78666,0.330136 -w ibex-sun -t 2021/07:30:23:55:10
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.521706,+0.786660,+0.330136
which is     R.A. +123.552 Decl. +19.277
missing      R.A. +130.179 Decl. +18.339 (ibex-sun)
error is     R.A.   +6.627 Decl.  +0.938
for a total  6.342 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0536 apogee:

ibex_rotate -o -u -0.585175,0.747537,0.314258 -w ibex-sun -t 2021/07:31:03:20:57
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.585175,+0.747537,+0.314258
which is     R.A. +128.054 Decl. +18.316
missing      R.A. +130.313 Decl. +18.299 (ibex-sun)
error is     R.A.   +2.259 Decl.  +0.017
for a total  2.145 deg

ibex_rotate -o -u -0.585175,0.747537,0.314258 -w ibex-sun -t 2021-08-04T23:13:24
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.585175,+0.747537,+0.314258
which is     R.A. +128.054 Decl. +18.316
missing      R.A. +134.878 Decl. +17.090 (ibex-sun)
error is     R.A.   +6.824 Decl.  +1.226
for a total  6.615 deg

There is no overlap with orbit 0534 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-8 at 10:47
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 #535 ATS Approval (22 - 31 July, 2021)
Caution - External Email

All,
   Attached are the planning files for Orbit #535. Please respond to this thread with comments and approvals.
Approvals are required by COB on 11 July 2021

Please note the following:

  1.  No Battery Balancing this orbit

  1.  Command Load Constraint Violation Report (CCVR)
IBEX_2021_203_o0535a_v001.ccvr
                # Input files:         1
#   IBEX_2021_203_o0535a_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 2021/07/22 16:55:55 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
             transition to science mode at 2021/07/26 12:44:18 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 01D774BA.AEAEF680]

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