All,

I have looked at the orbit 482 ATS,

IBEX_2020_087_o0482a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_087_o0482a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2) and the proximity of two contacts; the violations are expected.

The PL commands in the v001 ATS match those in the v002 STF,

IBEX_2020_087_o0482a_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_2020_087_o0482a_v001.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_Orbit482_Contacts.txt,

for all contacts (4).

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 481 left us pointing in safe directions for the orbit 482 arc A ascending and descending sequences:

ibex_rotate -o -u 0.996947,0.074733,0.0226 -w ibex-sun -t 2020/03:27:15:35:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.996947,+0.074733,+0.022600

which is R.A. +4.287 Decl. +1.295

missing R.A. +6.562 Decl. +2.814 (ibex-sun)

error is R.A. +2.275 Decl. +1.519

for a total 2.734 deg

ibex_rotate -o -u 0.996947,0.074733,0.0226 -w ibex-sun -t 2020/03:31:06:52:08

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.996947,+0.074733,+0.022600

which is R.A. +4.287 Decl. +1.295

missing R.A. +9.980 Decl. +4.298 (ibex-sun)

error is R.A. +5.693 Decl. +3.003

for a total 6.430 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 0.987853,0.146279,0.052423 -w ibex-sun -t 2020/03:31:08:35:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.987853,+0.146279,+0.052423

which is R.A. +8.423 Decl. +3.005

missing R.A. +10.045 Decl. +4.327 (ibex-sun)

error is R.A. +1.622 Decl. +1.322

for a total 2.090 deg

ibex_rotate -o -u 0.987853,0.146279,0.052423 -w ibex-sun -t 2020/03:31:10:10:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.987853,+0.146279,+0.052423

which is R.A. +8.423 Decl. +3.005

missing R.A. +10.105 Decl. +4.353 (ibex-sun)

error is R.A. +1.682 Decl. +1.348

for a total 2.153 deg

ibex_rotate -o -u 0.987853,0.146279,0.052423 -w ibex-sun -t 2020/04:04:20:50:51

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.987853,+0.146279,+0.052423

which is R.A. +8.423 Decl. +3.005

missing R.A. +14.036 Decl. +6.020 (ibex-sun)

error is R.A. +5.613 Decl. +3.015

for a total 6.355 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 483 apogee:

ibex_rotate -o -u 0.972761,0.216101,0.083887 -w ibex-sun -t 2020/04:05:00:11:21

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.972761,+0.216101,+0.083887

which is R.A. +12.525 Decl. +4.812

missing R.A.+14.160 Decl. +6.065 (ibex-sun)

error is R.A. +1.635 Decl. +1.253

for a total 2.054 deg

ibex_rotate -o -u 0.972761,0.216101,0.083887 -w ibex-sun -t 2020-04-09T16:56:32.094Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.972761,+0.216101,+0.083887

which is R.A. +12.525 Decl. +4.812

missing R.A.+18.583 Decl. +7.875 (ibex-sun)

error is R.A. +6.058 Decl. +3.063

for a total 6.754 deg

No Lo O-mode.

There is no overlap with orbit 481 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On March 16, 2020 at 8:22 AM "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com> wrote:

All,

   Attached are the planning files for Orbit #482

Please respond to this thread with comments and approvals.

Approvals are required by COB on 17 Mar 2020

Please note the following:

1.       Battery Balancing

# Orbit 482 Battery Balancing

# 2020-04-05T06:48:25.267Z,Perigee,orbit:482

@ECT_SetLongEclipseFlag TRUE $TIME=2020/04:05:06:00:00

@ECT_SetLongEclipseFlag FALSE $TIME=2020/04:05:07:30:00

2.       Command Load Constraint Violation Report (CCVR)

IBEX_2020_087_o0482a_v001_.ccvr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

These 2 IBX-CLC-006 soft violations are acceptable. The 2 contacts are as follows:

IBEX,USAK01,ADD,03/27/20,087,13:00:00,03/27/20,087,14:00:00,,LAHO 160K IBEX-3 Orbit# 481 SSR_Dump/Tracking Contact 14re Asc

IBEX,AUWA01,ADD,03/27/20,087,17:00:00,03/27/20,087,18:00:00,,LAHO 64K IBEX-3 Orbit# 482 HI BK Grnd Test 16re Asc End

The is a 3 hour gap between the 2 contacts. This will give the transmitters plenty of time to cool down. Also, the transmitter temp is a point that we routinely monitor.

IBX-CLC-006: Planned transmission at 2020/03/27 12:58:00 UTC - 2020/03/27

             14:02:00 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 2020/03/27 16:58:00 UTC - 2020/03/27

             18:02:00 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 2020/03/27 12:57:42 UTC

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

             transition to science mode at 2020/03/31 09:40:22 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