All,

I have looked at the orbit 380 ATS,

IBEX_2017_254_o0380a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2017_254_o0380a_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_2017_254_o0380a_v002.stf,

except the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass.

Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,

IBEX_2017_254_o0380a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts 6+ hours after perigee and runs for about 3 hours. No despinning should be required due to this outage.

There is one moon in Lo FOV session in arc A. The ATS start time is 7 hours after that in the OEF and the ATS end time is about 4 hours after 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_Orbit380_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 379 left us pointing in safe directions for the orbit 380 arc A ascending and descending sequences:

ibex_rotate -o -u -0.970909,0.22326,0.086547 -w ibex-sun -t 2017/09:11:18:57:17

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.970909,+0.223260,+0.086547

which is R.A. +167.050 Decl. +4.965

missing R.A. +169.861 Decl. +4.344 (ibex-sun)

error is R.A. +2.811 Decl. +0.621

for a total 2.870 deg

ibex_rotate -o -u -0.970909,0.22326,0.086547 -w ibex-sun -t 2017/09:15:12:13:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.970909,+0.223260,+0.086547

which is R.A. +167.050 Decl. +4.965

missing R.A. +173.109 Decl. +2.950 (ibex-sun)

error is R.A. +6.059 Decl. +2.015

for a total 6.371 deg

The inertial 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 -0.98669,0.152995,0.05509 -w ibex-sun -t 2017/09:15:13:56:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.986690,+0.152995,+0.055090

which is R.A. +171.186 Decl. +3.158

missing R.A. +173.174 Decl. +2.923 (ibex-sun)

error is R.A. +1.988 Decl. +0.235

for a total 1.999 deg

ibex_rotate -o -u -0.98669,0.152995,0.05509 -w ibex-sun -t 2017/09:15:15:31:29

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.986690,+0.152995,+0.055090

which is R.A. +171.186 Decl. +3.158

missing R.A. +173.233 Decl. +2.898 (ibex-sun)

error is R.A. +2.047 Decl. +0.260

for a total 2.061 deg

ibex_rotate -o -u -0.98669,0.152995,0.05509 -w ibex-sun -t 2017/09:20:05:23:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.986690,+0.152995,+0.055090

which is R.A. +171.186 Decl. +3.158

missing R.A. +177.468 Decl. +1.122 (ibex-sun)

error is R.A. +6.282 Decl. +2.036

for a total 6.599 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 381 apogee:

ibex_rotate -o -u -0.996542,0.07948,0.02424 -w ibex-sun -t 2017/09:20:07:58:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.996542,+0.079480,+0.024240

which is R.A. +175.440 Decl. +1.389

missing R.A. +177.566 Decl. +1.076 (ibex-sun)

error is R.A. +2.126 Decl. +0.313

for a total 2.149 deg

ibex_rotate -o -u -0.996542,0.07948,0.02424 -w ibex-sun -t 2017-09-25T06:34:06.599Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.996542,+0.079480,+0.024240

which is R.A. +175.440 Decl. +1.389

missing R.A. +181.871 Decl. -0.831 (ibex-sun)

error is R.A. +6.431 Decl. +2.220

for a total 6.803 deg

No Lo O-mode.

There is no overlap with orbit 379 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken

From: "Sheral Wesley" <Sheral.Wesley@OrbitalATK.com>
To: "Eric Chubin" <Eric.Chubin@OrbitalATK.com>, "David Heirtzler" <dheirtzl@atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg@applieddefense.com>, "IBEXOPS" <IBEXOPS@gmail.com>, "ISOC" <isocops@lists.sr.unh.edu>, "Ken Fairchild" <kwfairchild@gmail.com>, "Ken Fairchild" <fair-play@comcast.net>, "Robert Lockwood" <Robert.Lockwood@OrbitalATK.com>, "Nigel Angold" <nigel.angold@nasa.gov>, "Paul Janzen" <paul.janzen@umontana.edu>, "Timothy Perry" <Timothy.Perry@OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler@OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley@OrbitalATK.com>
Sent: Tuesday, August 29, 2017 2:41:54 PM
Subject: IBEX Orbit# 380 ATS (11 Sept - 20 Sept 17)

Guys,

Here are the planning files and ATS for Orbit# 380.

Please respond to this email thread with your comments and approvals.

Approvals are required before 30 Aug 17 @1700 UTC

Note the following:

1. Moon in Lo FOV Commands

# 2017-09-12T16:09:48.530Z,MoonInLoFovStart,orbit:380

# 2017-09-13T14:19:28.759Z,MoonInLoFovStop,orbit:380

2. APL-18 SSR_Dump/Tracking Contact

SetRelay stx,on $TIME=2017/09:20:09:58:00

SetDownlink2K $TIME=2017/09:20:09:58:02

SetBilevelOutputControlReg STXMODE_Strobe,ON $TIME=2017/09:20:09:58:04

SetBilevelOutputControlReg COHERENT,ON $TIME=2017/09:20:09:58:06

SetDownlink320K $TIME=2017/09:20:10:05:00

SSR_DUMP_NEW $TIME=2017/09:20:10:10:00

SetRelay stx,off $TIME=2017/09:20:11:02:00

3. PERIGEE Battery Balancing

2017-09-20T16:32:57.383Z,Perigee,orbit:380

SetLongEclipseFlag TRUE $TIME=2017/09:20:16:00:00

SetLongEclipseFlag FALSE $TIME=2017/09:20:17:30:00

4. Command Load Constraint Violation Report

IBEX_2017_254_o0380a_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 2017/09/11 17:09:11 UTC

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

transition to science mode at 2017/09/15 15:01:29 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Sheral R. Wesley

Sr Systems Engineer

IBEX , OCO2 Mission OPS

CRS/CYGNUS Mission Planning

Bldg. 2 Room 1337

Office (703) 406-5641

Cell (202) 236-0802

cid:image001.jpg@01D04F6C.5A1C97F0

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