All,
I have looked at the orbit 421 ATS,
IBEX_2018_262_o0421a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2018_262_o0421a_v001_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v002 ATS match those in the v002 STF,
IBEX_2018_262_o0421a_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_2018_262_0421a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days after 15 Re ascending and runs for 1+ days. Some despinning may be required due to this outage.
There are no moon in Lo FOV sessions.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit421_Contacts.txt,
for all contacts (3).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial maneuver at perigee of orbit 420 left us pointing in safe directions for the orbit 421 arc A ascending and descending sequences:
ibex_rotate -o -u -0.994907,0.095746,0.031498 -w ibex-sun -t 2018/09:20:09:02:30
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.994907,+0.095746,+0.031498
which is R.A. +174.503 Decl. +1.805
missing R.A. +177.336 Decl. +1.129 (ibex-sun)
error is R.A. +2.833 Decl. +0.676
for a total 2.911 deg
ibex_rotate -o -u -0.994907,0.095746,0.031498 -w ibex-sun -t 2018/09:23:20:19:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.994907,+0.095746,+0.031498
which is R.A. +174.503 Decl. +1.805
missing R.A. +180.356 Decl. -0.169 (ibex-sun)
error is R.A. +5.853 Decl. +1.974
for a total 6.177 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 -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:23:22:02:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999628,+0.027259,+0.000646
which is R.A. +178.438 Decl. +0.037
missing R.A. +180.421 Decl. -0.196 (ibex-sun)
error is R.A. +1.983 Decl. +0.233
for a total 1.997 deg
ibex_rotate -o -u -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:23:23:37:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999628,+0.027259,+0.000646
which is R.A. +178.438 Decl. +0.037
missing R.A. +180.481 Decl. -0.221 (ibex-sun)
error is R.A. +2.043 Decl. +0.258
for a total 2.059 deg
ibex_rotate -o -u -0.999628,0.027259,6.46E-4 -w ibex-sun -t 2018/09:28:07:08:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999628,+0.027259,+0.000646
which is R.A. +178.438 Decl. +0.037
missing R.A. +184.486 Decl. -1.916 (ibex-sun)
error is R.A. +6.048 Decl. +1.953
for a total 6.354 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 422 apogee:
ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018/09:28:09:42:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.998671,-0.042869,-0.028602
which is R.A. +182.458 Decl. -1.639
missing R.A. +184.585 Decl. -1.962 (ibex-sun)
error is R.A. +2.127 Decl. +0.323
for a total 2.151 deg
ibex_rotate -o -u -0.998671,-0.042869,-0.028602 -w ibex-sun -t 2018-10-03T07:03:47.188Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.998671,-0.042869,-0.028602
which is R.A. +182.458 Decl. -1.639
missing R.A. +188.874 Decl. -3.833 (ibex-sun)
error is R.A. +6.416 Decl. +2.194
for a total 6.774 deg
No Lo O-mode.
There is no overlap with orbit 420 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On September 7, 2018 at 10:37 AM "Perry, Timothy" <Timothy.Perry@OrbitalATK.com> wrote:
All,
Attached are the planning files for Orbit #421.
Please respond to this thread with comments and approvals.
Approvals are required before 9 Sept 2018 @ 16:00 gmt.
Note the following:
1. # Orbit# 421 PERIGEE Battery Balancing
# 2018-09-28T18:34:41.784Z,Perigee,orbit:421
@ECT_SetLongEclipseFlag TRUE $TIME=2018/09:28:18:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2018/09:28:19:30:00
# Input files: 1
# IBEX_2018_262_o0421a_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 2018/09/20 07:17:47 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/09/23 23:07:42 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E. Perry
CRS, IBEX, OCO-2 & TESS
Mission Operations
Tim.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430
Corp Cell (571) 447-8977
![cid:image002.png@01D43627.CCEBFFF0]()
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Thank you.
*********************