All,


Note: Angle at orbit 462 arc B descending after the apogee sun precession maneuver: 4.076 deg

Note: Angle at orbit 463 apogee after the perigee sun precession maneuver: 4.583 deg


I have looked at the orbit 462 ATS,


IBEX_2019_269_o0462a_v002.scr,


and I approve.


The only constraint violations in


IBEX_2019_269_o0462a_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 v002 STF,


IBEX_2019_269_o0462a_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_269_o0462a_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_Orbit462_Contacts_v2.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 461 left us pointing in safe directions for the orbit 462 arc A ascending and descending sequences:


ibex_rotate -o -r +182.046 -d -0.871 -w ibex-sun -t 2019/09:26:14:04:27

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999247,-0.035698,-0.015201

which is R.A. +182.046 Decl. -0.871

missing R.A. +182.690 Decl. -1.188 (ibex-sun)

error is R.A. +0.644 Decl. +0.317

for a total 0.718 deg


ibex_rotate -o -r +182.046 -d -0.871 -w ibex-sun -t 2019/09:30:12:46:09

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.999247,-0.035698,-0.015201

which is R.A. +182.046 Decl. -0.871

missing R.A. +186.150 Decl. -2.653 (ibex-sun)

error is R.A. +4.104 Decl. +1.782

for a total 4.472 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 +186.218 -d -2.681 -w ibex-sun -t 2019/09:30:14:34:17

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.993029,-0.108193,-0.046775

which is R.A. +186.218 Decl.  -2.681

missing R.A. +186.218 Decl. -2.681 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg


ibex_rotate -o -r +186.218 -d -2.681 -w ibex-sun -t 2019/09:30:16:04:23

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.993029,-0.108193,-0.046775

which is R.A. +186.218 Decl. -2.681

missing R.A. +186.275 Decl. -2.705 (ibex-sun)

error is R.A. +0.057 Decl. +0.024

for a total 0.062 deg


ibex_rotate -o -r +186.218 -d -2.681 -w ibex-sun -t 2019/10:04:14:52:06

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.993029,-0.108193,-0.046775

which is R.A. +186.218 Decl. -2.681

missing R.A. +189.977 Decl. -4.274 (ibex-sun)

error is R.A. +3.759 Decl. +1.593

for a total 4.076 deg


The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 463 apogee:


ibex_rotate -o -r +190.099 -d -4.332 -w ibex-sun -t 2019/10:04:18:01:39

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981694,-0.174849,-0.075536

which is R.A. +190.099 Decl. -4.332

missing R.A. +190.099 Decl. -4.332 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg


ibex_rotate -o -r +190.099 -d -4.332 -w ibex-sun -t 2019-10-09T12:51:04.351Z

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981694,-0.174849,-0.075536

which is R.A. +190.099 Decl. -4.332

missing R.A. +194.336 Decl. -6.121 (ibex-sun)

error is R.A. +4.237 Decl. +1.789

for a total 4.583 deg


No Lo O-mode.


There is no overlap with orbit 461 commands by manual inspection or by checking at


http://ibex.unh.edu/cgi-bin/ats.cgi.


Command Approval Checklist is attached.


Ken



On September 17, 2019 at 12:31 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #462

Please respond to this thread with comments and approvals.  

Approvals are required by COB Sept 21, 2019.  


Please note the following:

  1. Battery Balancing

 

  1. 2 Sun maneuvers

 

  1. Command Load Constraint Violation Report (CCVR)

# Filename:            IBEX_2019_269_o0462a_v002.ccvr

 

==========================

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 2019/09/26 11:46:57 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2019/09/30 15:34:23 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

 

cid:image001.png@01D542D6.6047A400

 

 


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