All,

I have looked at the orbit 475 ATS,

IBEX_2020_023_o0475a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_023_o0475a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2) and the length and proximity of contacts (although some of the warnings appear related to an orbit 474 contact that ends after the start of the orbit 475 ATS); the violations are expected.

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

IBEX_2020_023_o0475a_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_023_o0475a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts at apogee and runs for 2+ 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_Orbit475_Contacts.txt,

for all contacts (4).

We're not doing battery cell balancing this orbit; we'll do it again in the next orbit.

The inertial maneuver at perigee of orbit 474 left us pointing in safe directions for the orbit 475 arc A ascending and descending sequences:

ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020/01:23:22:27:21

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.556953,-0.757923,-0.339641

which is R.A. +306.310 Decl. -19.855

missing R.A. +305.422 Decl. -19.478 (ibex-sun)

error is R.A. +0.888 Decl. +0.377

for a total 0.917 deg

ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020/01:27:06:57:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.556953,-0.757923,-0.339641

which is R.A. +306.310 Decl. -19.855

missing R.A. +308.964 Decl. -18.631 (ibex-sun)

error is R.A. +2.654 Decl. +1.224

for a total 2.788 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 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/01:27:08:40:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.622298,-0.714510,-0.319720

which is R.A. +311.054 Decl. -18.646

missing R.A. +309.037 Decl. -18.612 (ibex-sun)

error is R.A. +2.017 Decl. +0.034

for a total 1.912 deg

ibex_rotate -o -u 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/01:27:10:15:36

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.622298,-0.714510,-0.319720

which is R.A. +311.054 Decl. -18.646

missing R.A. +309.104 Decl. -18.595 (ibex-sun)

error is R.A. +1.950 Decl. +0.051

for a total 1.849 deg

ibex_rotate -o -u 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/02:01:07:30:35

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.622298,-0.714510,-0.319720

which is R.A. +311.054 Decl. -18.646

missing R.A. +314.039 Decl. -17.291 (ibex-sun)

error is R.A. +2.985 Decl. +1.355

for a total 3.146 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 476 apogee:

ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020/02:01:10:59:33

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.684385,-0.664862,-0.299291

which is R.A. +315.829 Decl. -17.415

missing R.A. +314.194 Decl. -17.256 (ibex-sun)

error is R.A. +1.635 Decl. +0.159

for a total 1.569 deg

ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020-02-06T09:14:53.572Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.684385,-0.664862,-0.299291

which is R.A. +315.829 Decl. -17.415

missing R.A. +319.275 Decl. -15.782 (ibex-sun)

error is R.A. +3.446 Decl. +1.633

for a total 3.684 deg

No Lo O-mode.

There is no overlap with orbit 474 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On January 9, 2020 at 12:22 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com> wrote:

All,

Attached are the planning files for Orbit #475

Please respond to this thread with comments and approvals.

Approvals are required by COB on 13 Jan 2020.

Please note the following:

1.       No Battery Balancing

2.       Command Load Constraint Violation Report (CCVR)

               The 2 IBX-CLC-006 constraint violations are acceptable. This is because 2 contacts have been scheduled within in a 5 hour period.

IBEX,AUWA01,ADD,01/23/20,023,19:00:00,01/23/20,023,20:00:00,,LAHO 160K Orbit# 474 SSR_Dump/Tracking Contact 13.5re Asc

IBEX,USAK01,ADD,01/23/20,023,23:30:00,01/24/20,024,00:30:00,LAHO 160K IBEX-3 Orbit# 475 Lo Normal Sweep 16re ASC

IBEX_2020_023_o0475a_v001_.ccvr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

IBX-CLC-006: Planned transmission at 2020/01/23 20:00:00 UTC - 2020/01/23

             23:28:00 UTC exceeds the maximum contiguous transmission time of

             5400 seconds

IBX-CLC-006: Planned transmission at 2020/01/23 23:28:00 UTC - 2020/01/24

             00:32:00 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 16320.000 seconds)

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

             transition to science mode at 2020/01/23 20:01:23 UTC

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

             transition to science mode at 2020/01/27 09:45:36 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