All,
Note: Angle at orbit 461 arc B descending after the apogee sun precession maneuver: 4.135 deg
Note: Angle at orbit 462 apogee after the perigee sun precession maneuver: 4.526 deg
I have looked at the orbit 461 ATS,
IBEX_2019_260_o0461a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2019_260_o0461a_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the proximity of the perigee contacts; the violations are expected.
The PL commands in the v002 ATS match those in the v004 STF,
IBEX_2019_260_o0461a_v004.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_260_o0461a_v002.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit461_Contacts_v2.txt,
for all contacts (4).
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The sun precession maneuver at perigee of orbit 460 left us pointing in safe directions for the orbit 461 arc A ascending and descending sequences:
ibex_rotate -o -r +173.921 -d +2.643 -w ibex-sun -t 2019/09:17:12:07:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993319,+0.105787,+0.046113
which is R.A. +173.921 Decl. +2.643
missing R.A. +174.536 Decl. +2.341 (ibex-sun)
error is R.A. +0.615 Decl. +0.302
for a total 0.685 deg
ibex_rotate -o -r +173.921 -d +2.643 -w ibex-sun -t 2019/09:21:13:13:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.993319,+0.105787,+0.046113
which is R.A. +173.921 Decl. +2.643
missing R.A. +178.070 Decl. +0.842 (ibex-sun)
error is R.A. +4.149 Decl. +1.801
for a total 4.521 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 +178.138 -d +0.814 -w ibex-sun -t 2019/09:21:15:01:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999371,+0.032489,+0.014207
which is R.A. +178.138 Decl. +0.814
missing R.A. +178.138 Decl. +0.814 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +178.138 -d +0.814 -w ibex-sun -t 2019/09:21:16:31:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999371,+0.032489,+0.014207
which is R.A. +178.138 Decl. +0.814
missing R.A. +178.195 Decl. +0.790 (ibex-sun)
error is R.A. +0.057 Decl. +0.024
for a total 0.062 deg
ibex_rotate -o -r +178.138 -d +0.814 -w ibex-sun -t 2019/09:25:17:14:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999371,+0.032489,+0.014207
which is R.A. +178.138 Decl. +0.814
missing R.A. +181.937 Decl. -0.819 (ibex-sun)
error is R.A. +3.799 Decl. +1.633
for a total 4.135 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 462 apogee:
ibex_rotate -o -r +182.055 -d -0.875 -w ibex-sun -t 2019/09:25:20:20:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999240,-0.035855,-0.015271
which is R.A. +182.055 Decl. -0.875
missing R.A. +182.055 Decl. -0.875 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +182.055 -d -0.875 -w ibex-sun -t 2019-09-30T14:19:18.321Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999240,-0.035855,-0.015271
which is R.A. +182.055 Decl. -0.875
missing R.A. +186.209 Decl. -2.678 (ibex-sun)
error is R.A. +4.154 Decl. +1.803
for a total 4.526 deg
No Lo O-mode.
There is no overlap with orbit 460 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On September 9, 2019 at 4:39 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:
All,
Attached are the planning files for Orbit #461
Please respond to this thread with comments and approvals.
Approvals are required by COB on 12 Sept 2019.
Please note the following:
1. No Battery Balancing this orbit
2. We have 2 IBX-CLC-006 soft Constraint Error’s with this ATS. These errors are acceptable. On 09/16 we have 2 60 minute contacts planned that are separated by 2 hours. The limit for MPS is 90 minutes for a 5 hour period. The 2 hour period between contacts will allow the transmitter to cool down.
IBEX,AUWA01,ADD,09/25/19,268,15:00:00,09/25/19,268,16:00:00,,LAHO 160K IBEX-2 Orbit# 461 Hi BG Test End
IBEX,USHI01,ADD,09/25/19,268,18:00:00,09/25/19,268,19:00:00,,LAHO 160K IBEX-2 Orbit# 461 SSR_Dump/Tracking Contact
3. The time of the apogee maneuver time has changed from 2019-09-21 04:46:14 to 2019-09-21 14:46:14. So, the apogee contact had to be rescheduled from 09/21/19 09:00:00 to 09/22/19 03:00:00.
4. Command Load Constraint Violation Report (CCVR)
# Filename: IBEX_2019_260_o0461a_v002.ccvr
# Input files: 1
# IBEX_2019_260_o0461a_v002.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-006: Planned transmission at 2019/09/25 14:58:00 UTC - 2019/09/25
16:02:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-006: Planned transmission at 2019/09/25 17:58:00 UTC - 2019/09/25
19:02:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/09/17 09:46:50 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/09/21 16:01:20 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
tim.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430
![cid:image001.png@01D542D6.6047A400]()
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*********************