All,
Note: Angle at orbit 402 arc B descending after the apogee sun precession maneuver: 3.772 deg
I have looked at the orbit 402 ATS,
IBEX_2018_088_o0402a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_088_o0402a_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_2018_088_o0402a_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_088_o0402a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts before orbit 401 15 Re descending and ends about 3 hours after 15 Re ascending. The second starts about 1 day 8 hours before apogee and runs for 3+ days. Some despinning may be required due to these outages.
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_Orbit402_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 401 left us pointing in safe directions for the orbit 402 arc A ascending and descending sequences:
ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018/03:30:06:06:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.989332,+0.133517,+0.058278
which is R.A. +7.686 Decl. +3.341
missing R.A. +8.496 Decl. +3.641 (ibex-sun)
error is R.A. +0.810 Decl. +0.300
for a total 0.862 deg
ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018/04:03:03:47:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.989332,+0.133517,+0.058278
which is R.A. +7.686 Decl. +3.341
missing R.A. +12.154 Decl. +5.200 (ibex-sun)
error is R.A. +4.468 Decl. +1.859
for a total 4.828 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 +12.222 -d +5.230 -w ibex-sun -t 2018/04:03:05:35:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.973266,+0.210819,+0.091154
which is R.A. +12.222 Decl. +5.230
missing R.A. +12.222 Decl. +5.230 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +12.222 -d +5.230 -w ibex-sun -t 2018/04:03:07:05:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.973266,+0.210819,+0.091154
which is R.A. +12.222 Decl. +5.230
missing R.A. +12.279 Decl. +5.254 (ibex-sun)
error is R.A. +0.057 Decl. +0.024
for a total 0.062 deg
ibex_rotate -o -r +12.222 -d +5.230 -w ibex-sun -t 2018/04:07:04:25:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.973266,+0.210819,+0.091154
which is R.A. +12.222 Decl. +5.230
missing R.A. +15.707 Decl. +6.720 (ibex-sun)
error is R.A. +3.485 Decl. +1.490
for a total 3.772 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 403 apogee:
ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018/04:07:06:52:45
Quaternion+0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.964694,+0.245198,+0.096141
which is R.A. +14.261 Decl. +5.517
missing R.A. +15.796 Decl. +6.753 (ibex-sun)
error is R.A. +1.535 Decl. +1.236
for a total 1.964 deg
ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018-04-12T03:19:39.042Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.964694,+0.245198,+0.096141
which is R.A. +14.261 Decl. +5.517
missing R.A.+20.379 Decl. +8.570 (ibex-sun)
error is R.A. +6.118 Decl. +3.053
for a total 6.795 deg
No Lo O-mode.
There is no overlap with orbit 401 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On March 18, 2018 at 5:39 PM "Wesley, Sheral" <Sheral.Wesley@OrbitalATK.com> wrote:
Guys,
Here are the planning products and ATS for Orbit# 402.
The OEF started with Orbit# 400 because of the sun maneuver at perigee of Orbit# 401
Please respond to this email thread with your comments and approvals.
Approvals are required before 19 Mar 18 @2200 UTC
Note the following:
1. Apogee Sun Maneuver
2018-04-01T20:53:19.634Z,StarTrackerOutageStart,dueTo:moon,orbit:402
2018-04-03T05:18:07.098Z,Apogee,
2018-04-05T01:29:05.648Z,StarTrackerOutageStop,dueTo:moon,orbit:402
2. Battery Balancing
Orbit# 402 PERIGEE Battery Balancing
# 2018-04-07T16:03:08.794Z,Perigee,orbit:402
SetLongEclipseFlag TRUE $TIME=2018/04:07:16:00:00
SetLongEclipseFlag FALSE $TIME=2018/04:07:17:30:00
3. Command Load Constraint Violation Report
IBEX_2018_088_o0402a_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 2018/03/30 04:24:20 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/04/03 06:35:25 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Sheral R. Wesley
Sr Systems Engineer
IBEX , OCO2 Mission OPS
CRS/CYGNUS Mission Planning
Bldg. 2 Room 1337
Office (703) 406-5641
Cell (202) 236-0802
![cid:image001.jpg@01D04F6C.5A1C97F0]()
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*********************