All,
Note: Angle at orbit 438 apogee after the perigee sun precession maneuver: 5.021 deg
I have looked at the orbit 437 ATS,
IBEX_2019_041_o0437a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_041_o0437a_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_041_o0437a_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_041_o0437a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts almost 3 days before 15 Re descending and runs for 4- 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_Orbit437_Contacts.txt,
for all contacts (3).
The inertial maneuver at perigee of orbit 436 left us pointing in safe directions for the orbit 437 arc A ascending and descending sequences:
ibex_rotate -o -u 0.794949,-0.552484,-0.250633 -w ibex-sun -t 2019/02:11:05:45:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.794949,-0.552484,-0.250633
which is R.A. +325.201 Decl. -14.515
missing R.A. +324.331 Decl. -14.210 (ibex-sun)
error is R.A. +0.870 Decl. +0.305
for a total 0.897 deg
ibex_rotate -o -u 0.794949,-0.552484,-0.250633 -w ibex-sun -t 2019/02:14:23:46:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.794949,-0.552484,-0.250633
which is R.A. +325.201 Decl. -14.515
missing R.A. +328.067 Decl. -12.922 (ibex-sun)
error is R.A. +2.866 Decl. +1.593
for a total 3.208 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 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:15:01:29:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.842234,-0.490861,-0.222927
which is R.A. +329.766 Decl. -12.881
missing R.A. +328.135 Decl. -12.896 (ibex-sun)
error is R.A. +1.631 Decl. +0.015
for a total 1.590 deg
ibex_rotate -o -u 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:15:03:04:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.842234,-0.490861,-0.222927
which is R.A. +329.766 Decl. -12.881
missing R.A. +328.199 Decl. -12.873 (ibex-sun)
error is R.A. +1.567 Decl. +0.008
for a total 1.528 deg
ibex_rotate -o -u 0.842234,-0.490861,-0.222927 -w ibex-sun -t 2019/02:19:17:00:15
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.842234,-0.490861,-0.222927
which is R.A. +329.766 Decl. -12.881
missing R.A. +332.523 Decl. -11.287 (ibex-sun)
error is R.A. +2.757 Decl. +1.594
for a total 3.132 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 438 apogee:
ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019/02:19:19:58:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.871117,-0.450676,-0.195056
which is R.A. +332.645 Decl. -11.248
missing R.A. +332.645 Decl. -11.248 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +332.645 -d -11.248 -w ibex-sun -t 2019-02-24T16:58:18.672Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.871117,-0.450676,-0.195056
which is R.A. +332.645 Decl. -11.248
missing R.A. +337.412 Decl. -9.452 (ibex-sun)
error is R.A. +4.767 Decl. +1.796
for a total 5.021 deg
No Lo O-mode.
There is no overlap with orbit 436 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On January 28, 2019 at 3:15 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:
All,
Attached are the planning files for Orbit #437.
Please respond to this thread with comments and approvals.
Approvals are required by COB on 31 Jan 2019.
Please note the following:
1. No Battery Balancing
2. Perigee Sun Maneuver
3. IBEX_2019_041_o0437a_v001_.ccvr
# Input files: 1
# IBEX_2019_041_o0437a_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 2019/02/11 03:38:09 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/02/15 02:34:22 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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