All,
Note: Angle at orbit 464 arc B descending after the apogee sun precession maneuver: 4.241 deg
Note: Angle at orbit 465 apogee after the perigee sun precession maneuver: 4.639 deg
I have looked at the orbit 464 ATS,
IBEX_2019_287_o0464a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2019_287_o0464a_v002.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v002 ATS match those in the v004 STF,
IBEX_2019_287_o0464a_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_287_o0464a_v003.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_Orbit464_Contacts_v2.txt,
for all contacts (3). The contact to check the star tracker is a blind acq.
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 463 left us pointing in safe directions for the orbit 464 arc A ascending and descending sequences (ascending sequence commented out):
ibex_rotate -o -r +198.401 -d -7.780 -w ibex-sun -t 2019/10:14:10:53:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.940136,-0.312760,-0.135370
which is R.A. +198.401 Decl. -7.780
missing R.A. +198.982 Decl. -8.047 (ibex-sun)
error is R.A. +0.581 Decl. +0.267
for a total 0.634 deg
ibex_rotate -o -r +198.401 -d -7.780 -w ibex-sun -t 2019/10:18:14:01:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.940136,-0.312760,-0.135370
which is R.A. +198.401 Decl. -7.780
missing R.A. +202.713 Decl. -9.498 (ibex-sun)
error is R.A. +4.312 Decl. +1.718
for a total 4.596 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 +202.783 -d -9.524 -w ibex-sun -t 2019/10:18:15:49:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.909270,-0.381904,-0.165461
which is R.A. +202.783 Decl. -9.524
missing R.A. +202.783 Decl. -9.524 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +202.783 -d -9.524 -w ibex-sun -t 2019/10:18:17:19:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.909270,-0.381904,-0.165461
which is R.A. +202.783 Decl. -9.524
missing R.A. +202.842 Decl. -9.546 (ibex-sun)
error is R.A. +0.059 Decl. +0.022
for a total 0.062 deg
ibex_rotate -o -r +202.783 -d -9.524 -w ibex-sun -t 2019/10:22:19:19:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.909270,-0.381904,-0.165461
which is R.A. +202.783 Decl. -9.524
missing R.A. +206.808 Decl. -11.043 (ibex-sun)
error is R.A. +4.025 Decl. +1.519
for a total 4.241 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 465 apogee:
ibex_rotate -o -r +206.945 -d -11.100 -w ibex-sun -t 2019/10:22:22:40:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.874765,-0.444658,-0.192522
which is R.A. +206.945 Decl. -11.100
missing R.A. +206.945 Decl. -11.100 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +206.945 -d -11.100 -w ibex-sun -t 2019-10-27T17:19:55.986Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.874765,-0.444658,-0.192522
which is R.A. +206.945 Decl. -11.100
missing R.A. +211.388 Decl. -12.717 (ibex-sun)
error is R.A. +4.443 Decl. +1.617
for a total 4.639 deg
No Lo O-mode.
There is no overlap with orbit 463 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
On October 16, 2019 at 7:39 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com> wrote:
All,
Attached are the planning files for Orbit #464 Version 2
Please respond to this thread with comments and approvals.
Please note the following:
1. No Battery balancing
2. 2 Sun Maneuvers
3. Apogee contact has moved from 10/18/19,291,06:00:00 to 10/18/19,291,23:30:00
4. A contact has been scheduled to look at the star tracker “IBEX,USHI02,ADD,10/17/19,290,22:50:00,10/18/19,291,00:20:00,LAHO 2K IBEX-2 Orbit# 464 Apogee star tracker Contact”
5. ATS commands start at the descending commands @2019/10:18:13:38:50
6. Command Load Constraint Violation Report (CCVR)
# Input files: 1
# IBEX_2019_287_o0464a_v002.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 2019/10/14 08:07:55 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2019/10/18 16:49:54 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430
