All,
Note: Angle at orbit 441 arc B descending after the apogee sun precession maneuver: 3.964 deg
I have looked at the orbit 441 ATS,
IBEX_2019_078_o0441a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_078_o0441a_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_078_o0441a_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_078_o0441a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts before 15 Re descending in orbit 440 and runs for about 2 days. The second starts 2+ days before apogee and runs for 3+ days. Some despinning may be required due to these outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit441_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 sun precession maneuver at perigee of orbit 440 left us pointing in safe directions for the orbit 441 arc A ascending and descending sequences:
ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019/03:20:06:08:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999601,-0.026001,-0.011030
which is R.A. +358.510 Decl. -0.632
missing R.A. +359.158 Decl. -0.387 (ibex-sun)
error is R.A. +0.648 Decl. +0.245
for a total 0.693 deg
ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019/03:24:08:21:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999601,-0.026001,-0.011030
which is R.A. +358.510 Decl. -0.632
missing R.A. +2.986 Decl. +1.294 (ibex-sun)
error is R.A. +355.524 Decl. +1.926
for a total 4.872 deg
The sun 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 -r +3.053 -d +1.325 -w ibex-sun -t 2019/03:24:10:09:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998314,+0.053245,+0.023124
which is R.A. +3.053 Decl. +1.325
missing R.A. +3.053 Decl. +1.325 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +3.053 -d +1.325 -w ibex-sun -t 2019/03:24:11:40:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998314,+0.053245,+0.023124
which is R.A. +3.053 Decl. +1.325
missing R.A. +3.110 Decl. +1.350 (ibex-sun)
error is R.A. +0.057 Decl. +0.025
for a total 0.062 deg
ibex_rotate -o -r +3.053 -d +1.325 -w ibex-sun -t 2019/03:28:13:24:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998314,+0.053245,+0.023124
which is R.A. +3.053 Decl. +1.325
missing R.A. +6.688 Decl. +2.912 (ibex-sun)
error is R.A. +3.635 Decl. +1.587
for a total 3.964 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 442 apogee:
ibex_rotate -o -u 0.995481,0.090333,0.029282 -w ibex-sun -t 2019/03:28:16:37:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.995481,+0.090333,+0.029282
which is R.A. +5.185 Decl. +1.678
missing R.A. +6.808 Decl. +2.957 (ibex-sun)
error is R.A. +1.623 Decl. +1.279
for a total 2.065 deg
ibex_rotate -o -u 0.995481,0.090333,0.029282 -w ibex-sun -t 2019-04-02T12:58:30.243Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.995481,+0.090333,+0.029282
which is R.A. +5.185 Decl. +1.678
missing R.A.+11.357 Decl. +4.880 (ibex-sun)
error is R.A. +6.172 Decl. +3.202
for a total 6.943 deg
No Lo O-Mode.
There is no overlap with orbit 440 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On March 6, 2019 at 11:08 AM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:
All,
Attached are the planning files for Orbit #441.
Please respond to this thread with comments and approvals.
Approvals are required by COB 09 March 2019.
Please Note the following:
1. # Orbit 441 Battery Balancing
# 2019-03-28T23:25:33.907Z,Perigee,orbit:441
@ECT_SetLongEclipseFlag TRUE $TIME=2019/03:28:23:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2019/03:29:00:30:00
2. Apogee Sun Maneuver @ 2019/03:24:09:54:59
3. The APL pass was replaced with a USAK01 contact
IBEX,APL,CANCELED,03/28/19,087,21:30:00,03/28/19,87,22:30:00,,LAHO 2-320K IBEX-1 Orbit # 441 SSR_Dump/Tracking Contact
IBEX,USAK01,ADD,03/28/19,087,21:30:00,03/28/19,087,22:30:00,,LAHO 160K IBEX-1 Orbit # 441 SSR_Dump/Tracking Contact
4. The Second perigee Pass is at 15 re asc and will double as the Hi Background Test End pass. This will be in the Orbit # 442 ATS
IBEX,USHI01,ADD,03/29/19,088,10:00:00,03/29/19,088,11:00:00,,LAHO 64K IBEX-1 Orbit # 442 Hi background Test End/Tracking Contact 15 re
5. IBEX_2019_078_o0441a_v001_.ccvr
# Input files: 1
# IBEX_2019_078_o0441a_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 2019/03/20 03:35:09 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/03/24 11:10:05 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E. Perry
Mission Operations
CRS, IBEX, OCO-2 & TESS
RAPTOR Test Team
timothy.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430
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Thank you.
*********************