All,

I have looked at the orbit 417 ATS,

IBEX_2018_226_o0417a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2018_226_o0417a_v001_.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

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

IBEX_2018_226_o0417a_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_2018_226_o0417a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 1+ hours after perigee and runs for 10+ hours.  No despinning should be required due to this outage.

There is one moon in Lo FOV session in arc B.  The ATS start time is 1+ hours after that in the OEF and the ATS end time is 2 hours before that in the OEF.  These differences are not unusual.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit417_Contacts.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 inertial maneuver at perigee of orbit 416 left us pointing in safe directions for the orbit 417 arc A ascending and descending sequences:

ibex_rotate -o -u -0.757047,0.603046,0.251427 -w ibex-sun -t 2018/08:15:01:53:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.757047,+0.603046,+0.251427

which is R.A. +141.460 Decl. +14.562

missing R.A. +144.306 Decl. +14.171 (ibex-sun)

error is R.A. +2.846 Decl. +0.391

for a total 2.784 deg

ibex_rotate -o -u -0.757047,0.603046,0.251427 -w ibex-sun -t 2018/08:18:16:47:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.757047,+0.603046,+0.251427

which is R.A. +141.460 Decl. +14.562

missing R.A. +147.638 Decl. +13.049 (ibex-sun)

error is R.A. +6.178 Decl. +1.513

for a total 6.187 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 -0.804154,0.54938,0.226974 -w ibex-sun -t 2018/08:18:18:30:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.804154,+0.549380,+0.226974

which is R.A. +145.660 Decl. +13.119

missing R.A. +147.706 Decl. +13.027 (ibex-sun)

error is R.A. +2.046 Decl. +0.092

for a total 1.995 deg

ibex_rotate -o -u -0.804154,0.54938,0.226974 -w ibex-sun -t 2018/08:18:20:05:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.804154,+0.549380,+0.226974

which is R.A. +145.660 Decl. +13.119

missing R.A. +147.768 Decl. +13.006 (ibex-sun)

error is R.A. +2.108 Decl. +0.113

for a total 2.057 deg

ibex_rotate -o -u -0.804154,0.54938,0.226974 -w ibex-sun -t 2018/08:23:05:52:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.804154,+0.549380,+0.226974

which is R.A. +145.660 Decl. +13.119

missing R.A. +151.951 Decl. +11.548 (ibex-sun)

error is R.A. +6.291 Decl. +1.571

for a total 6.343 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 418 apogee:

ibex_rotate -o -u -0.847595,0.490445,0.202599 -w ibex-sun -t 2018/08:23:08:25:24

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.847595,+0.490445,+0.202599

which is R.A. +149.945 Decl. +11.689

missing R.A. +152.048 Decl. +11.508 (ibex-sun)

error is R.A. +2.103 Decl. +0.181

for a total 2.068 deg

ibex_rotate -o -u -0.847595,0.490445,0.202599 -w ibex-sun -t 2018-08-28T05:17:15.798Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.847595,+0.490445,+0.202599

which is R.A. +149.945 Decl. +11.689

missing R.A. +156.400 Decl. +9.839 (ibex-sun)

error is R.A. +6.455 Decl. +1.850

for a total 6.605 deg

No Lo O-mode.

There is no overlap with orbit 416 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On August 1, 2018 at 1:59 PM "Perry, Timothy" <Timothy.Perry@OrbitalATK.com> wrote:

All,

   Attached are the planning files for Orbit #417.

Please respond to this thread with comments and approvals.

Approvals are required before 3 Aug 2018 @ 22:00 gmt.

Note the following:

1.    Battery Balancing

# Orbit# 417 PERIGEE Battery Balancing 

#  2018-08-23T17:25:53.447Z,Perigee,orbit:417

  @ECT_SetLongEclipseFlag TRUE $TIME=2018/08:23:17:00:00

  @ECT_SetLongEclipseFlag FALSE $TIME=2018/08:23:18:30:00

2.    Moon in Lo FOV

#  Orbit# 417  MoonInLoFov 

#  2018-08-20T18:59:55.526Z,MoonInLoFovStart,orbit:417

#  2018-08-21T12:40:49.651Z,MoonInLoFovStop,orbit:417 

 

3. # Input files:         1

#   IBEX_2018_226_o0417a_v001.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 2018/08/15 00:03:07 UTC

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

             transition to science mode at 2018/08/18 19:35:37 UTC

 

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

OTHER MESSAGES

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

NO MESSAGES.

 

 

 

Timothy E. Perry

CRS, IBEX, OCO-2 & TESS

Mission Operations

Tim.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

Corp Cell (571) 447-8977

 

 

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