All,
I have looked at the orbit 444 ATS,
IBEX_2019_106_o0444a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_106_o0444a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2019_106_o0444a_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_2019_106_o0444a_v002.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 8 hours after apogee and runs for 2- days. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit444_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 443 left us pointing in safe directions for the orbit 444 arc A ascending and descending sequences:
ibex_rotate -o -u 0.915887,0.371828,0.151313 -w ibex-sun -t 2019/04:16:20:53:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.915887,+0.371828,+0.151313
which is R.A. +22.096 Decl. +8.703
missing R.A. +24.393 Decl. +10.130 (ibex-sun)
error is R.A. +2.297 Decl. +1.427
for a total 2.677 deg
ibex_rotate -o -u 0.915887,0.371828,0.151313 -w ibex-sun -t 2019/04:20:13:24:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.915887,+0.371828,+0.151313
which is R.A. +22.096 Decl. +8.703
missing R.A. +27.937 Decl. +11.472 (ibex-sun)
error is R.A. +5.841 Decl. +2.769
for a total 6.382 deg
The inertial 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 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:20:15:07:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.882057,+0.436227,+0.177995
which is R.A. +26.315 Decl. +10.253
missing R.A. +28.004 Decl. +11.498 (ibex-sun)
error is R.A. +1.689 Decl. +1.245
for a total 2.074 deg
ibex_rotate -o -u 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:20:16:43:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.882057,+0.436227,+0.177995
which is R.A. +26.315 Decl. +10.253
missing R.A. +28.066 Decl. +11.522 (ibex-sun)
error is R.A. +1.751 Decl. +1.269
for a total 2.137 deg
ibex_rotate -o -u 0.882057,0.436227,0.177995 -w ibex-sun -t 2019/04:25:03:35:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.882057,+0.436227,+0.177995
which is R.A. +26.315 Decl. +10.253
missing R.A. +32.120 Decl. +13.001 (ibex-sun)
error is R.A. +5.805 Decl. +2.748
for a total 6.315 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 445 apogee:
ibex_rotate -o -u 0.842741,0.497443,0.20576 -w ibex-sun -t 2019/04:25:06:41:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.842741,+0.497443,+0.205760
which is R.A. +30.552 Decl. +11.874
missing R.A. +32.237 Decl. +13.036 (ibex-sun)
error is R.A. +1.685 Decl. +1.162
for a total 2.014 deg
ibex_rotate -o -u 0.842741,0.497443,0.20576 -w ibex-sun -t 2019-04-30T03:01:17.328Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000 000,+0.000000,+0.000000
towards ECI +0.842741,+0.497443,+0.205760
which is R.A. +30.552 Decl. +11.874
missing R.A. +36.943 Decl. +14.602 (ibex-sun)
error is R.A. +6.391 Decl. +2.728
for a total 6.793 deg
No Lo O-mode.
There is no overlap with orbit 443 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On April 4, 2019 at 1:54 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:
All,
Attached are the planning files for Orbit #444.
Please respond to this thread with comments and approvals.
Approvals are required by 1500z 6 April 2019.
Please Note the following:
1. Battery Balancing
# Orbit 444 Battery Balancing
# 2019-04-25T13:49:35.760Z,Perigee,orbit:444
@ECT_SetLongEclipseFlag TRUE $TIME=2019/04:25:13:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2019/04:25:14:30:00
2. IBEX_2019_106_o0444a_v001.ccvr
# Input files: 1
# IBEX_2019_106_o0444a_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 2019/04/16 18:14:02 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/04/20 16:13:02 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
tim.perry@orbitalatk.com
Office (703) 406-5976
Cell (301) 606-1430
![cid:image001.jpg@01D04F4E.6B1BECE0]()
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