All,

Note: Angle at orbit 441 apogee after the perigee sun precession maneuver: 4.936 deg

I have looked at the orbit 440 ATS,

IBEX_2019_069_o0440a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2019_069_o0440a_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_2019_069_o0440a_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_069_o0440a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 13+ hours before 15 Re descending and runs for 1+ 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_Orbit440_Contacts.txt,

for all contacts (2).

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

The inertial precession maneuver at perigee of orbit 439 left us pointing in safe directions for the orbit 440 arc A ascending and descending sequences:

ibex_rotate -o -u 0.986167,-0.147736,-0.075153 -w ibex-sun -t 2019/03:10:21:13:05

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.986167,-0.147736,-0.075153

which is R.A. +351.480 Decl. -4.310

missing R.A. +350.579 Decl. -4.081 (ibex-sun)

error is R.A. +0.901 Decl. +0.229

for a total 0.927 deg

ibex_rotate -o -u 0.986167,-0.147736,-0.075153 -w ibex-sun -t 2019/03:14:16:15:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.986167,-0.147736,-0.075153

which is R.A. +351.480 Decl. -4.310

missing R.A. +354.162 Decl. -2.532 (ibex-sun)

error is R.A. +2.682 Decl. +1.778

for a total 3.214 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 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:14:17:58:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.993566,-0.099644,-0.053835

which is R.A. +354.273 Decl. -3.086

missing R.A. +354.227 Decl. -2.503 (ibex-sun)

error is R.A. +0.046 Decl. +0.583

for a total 0.585 deg

ibex_rotate -o -u 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:14:19:33:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.993566,-0.099644,-0.053835

which is R.A. +354.273 Decl. -3.086

missing R.A. +354.287 Decl. -2.476 (ibex-sun)

error is R.A. +0.014 Decl. +0.610

for a total 0.610 deg

ibex_rotate -o -u 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:19:10:33:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.993566,-0.099644,-0.053835

which is R.A. +354.273 Decl. -3.086

missing R.A. +358.382 Decl. -0.680 (ibex-sun)

error is R.A. +4.109 Decl. +2.406

for a total 4.760 deg

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 441 apogee:

ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019/03:19:13:55:21

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999601,-0.026001,-0.011030

which is R.A. +358.510 Decl. -0.632

missing R.A. +358.510 Decl. -0.632 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019-03-24T09:54:34.035Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999601,-0.026001,-0.011030

which is R.A. +358.510 Decl. -0.632

missing R.A. +3.044 Decl. +1.320 (ibex-sun)

error is R.A. +355.466 Decl. +1.952

for a total 4.936 deg

No Lo O-mode.

There is no overlap with orbit 439 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

On February 26, 2019 at 2:54 PM "Perry, Timothy" <Timothy.Perry@ngc.com> wrote:

This time with the files…

 

From: Perry, Timothy
Sent: Tuesday, February 26, 2019 2:53 PM
To: Chubin, Eric <Eric.Chubin@ngc.com>; Colin Joyce <colin.joyce@unh.edu>; David Heirtzler <David.Heirtzler@unh.edu>; Dreyer, Sean <Sean.Dreyer@ngc.com>; IBEX-FDG <IBEX.fdg@applieddefense.com>; IBEXOPS <IBEXOPS@gmail.com>; 'ISOC' <isocops@lists.sr.unh.edu>; Ken Fairchild <fair-play@comcast.net>; Ken Fairchild (kwfairchild@gmail.com) <kwfairchild@gmail.com>; Nigel Angold <nigel.angold@nasa.gov>; Paul Janzen <paul.janzen@umontana.edu>; Perry, Timothy <Timothy.Perry@ngc.com>; Tyler, Ryan <Ryan.Tyler@ngc.com>; Wesley, Sheral <Sheral.Wesley@ngc.com>
Subject: IBEX Orbit #440 ATS Approval ( 10 - 20 Mar )

 

All,

   Attached are the planning files for Orbit #440.

Please respond to this thread with comments and approvals.

Approvals are required by 20:00 gmt 28 Feb 2019.

 

Please note the following:

1.       No Battery Balancing this orbit.

2.       The SSR dump pass will be uplinked on the orbit #441 ATS. The contact is at 14.5re ascending. (USHI01 03/20/19 079 04:00:00 - 05:00:00 160K)

3.       IBEX_2019_069_o0440a_v001_.ccvr

# Input files:         1

#   IBEX_2019_069_o0440a_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 2019/03/10 18:39:25 UTC

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

             transition to science mode at 2019/03/14 19:03:54 UTC

 

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

OTHER MESSAGES

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

NO MESSAGES.

 

 

 

Timothy E. Perry

Mission Operations

CRS, IBEX, OCO-2 & TESS

RAPTOR Test Team

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

 

 

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