All,

Note: Angle at orbit 395 arc B descending after the apogee sun precession maneuver: 4.043 deg

I have looked at the orbit 395 ATS,

IBEX_2018_026_o0395a_v001.scr,

and I approve.

The only constraint violations in

IBEX_2018_026_o0395a_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_026_o0395a_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_026_o0395a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts 1+ days before apogee and runs 4+ days. Some despinning may be required due to this outage.

There are no moon in Lo FOV sessions.

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

IBEX_Orbit395_Contacts.txt,

for all contacts (3).

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

The inertial maneuver at perigee of orbit 394 left us pointing in safe directions for the orbit 395 arc A ascending and descending sequences:

ibex_rotate -o -u 0.538574,-0.769221,-0.343856 -w ibex-sun -t 2018/01:26:12:20:03

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.538574,-0.769221,-0.343856

which is R.A. +304.998 Decl. -20.112

missing R.A. +308.665 Decl. -18.726 (ibex-sun)

error is R.A. +3.667 Decl. +1.386

for a total 3.726 deg

ibex_rotate -o -u 0.538574,-0.769221,-0.343856 -w ibex-sun -t 2018/01:30:11:43:18

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.538574,-0.769221,-0.343856

which is R.A. +304.998 Decl. -20.112

missing R.A. +312.775 Decl. -17.668 (ibex-sun)

error is R.A. +7.777 Decl. +2.444

for a total 7.753 deg

The sun 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 -r +312.851 -d -17.647 -w ibex-sun -t 2018/01:30:13:31:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.648090,-0.698626,-0.303152

which is R.A. +312.851 Decl. -17.647

missing R.A. +312.851 Decl. -17.647 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +312.851 -d -17.647 -w ibex-sun -t 2018/01:30:15:01:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.648090,-0.698626,-0.303152

which is R.A. +312.851 Decl. -17.647

missing R.A. +312.914 Decl. -17.629 (ibex-sun)

error is R.A. +0.063 Decl. +0.018

for a total 0.063 deg

ibex_rotate -o -r +312.851 -d -17.647 -w ibex-sun -t 2018/02:03:14:41:21

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.648090,-0.698626,-0.303152

which is R.A. +312.851 Decl. -17.647

missing R.A. +316.898 Decl. -16.473 (ibex-sun)

error is R.A. +4.047 Decl. +1.174

for a total 4.043 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 396 apogee:

ibex_rotate -o -u 0.667031,-0.679725,-0.305031 -w ibex-sun -t 2018/02:03:16:53:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.667031,-0.679725,-0.305031

which is R.A. +314.460 Decl. -17.760

missing R.A. +316.993 Decl. -16.448 (ibex-sun)

error is R.A. +2.533 Decl. +1.312

for a total 2.754 deg

ibex_rotate -o -u 0.667031,-0.679725,-0.305031 -w ibex-sun -t 2018-02-08T13:21:29.901Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.667031,-0.679725,-0.305031

which is R.A. +314.460 Decl. -17.760

missing R.A. +321.953 Decl. -14.973 (ibex-sun)

error is R.A. +7.493 Decl. +2.787

for a total 7.709 deg

No Lo O-mode.

There is no overlap with orbit 394 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>, "Colin Joyce" <cjl46@wildcats.unh.edu>, "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: Friday, January 12, 2018 8:55:01 PM
Subject: IBEX Orbit# 395 ATS Approval (26 Jan 18 - 4 Feb 18)

Guys,

Here are the planning files and ATS for Orbit# 395.

Please respond to this email thread with your comments and approvals

Approvals are required before 15 Jan 18 @1400 UTC

Note the following:

1. Apogee Sun Maneuver

2. IBEX_Hi Gain Test

# Orbit# 395 APOGEE: IBEX_Hi Gain Test

#CEU_MODE HVENG $TIME=2018/02:01:14:30:00

#CEU_MODE HVSCI $TIME=2018/02:01:18:45:41

3. No Battery Balancing Commands

We have set the long eclipse flag for Orbits 391,392, 393 and 394

4. Command Load Constraint Violation Report

IBEX_2018_026_o0395a_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 2018/01/26 10:52:49 UTC

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

transition to science mode at 2018/01/30 14:31:32 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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