[Isocops] IBEX Orbit# 388 ATS Approval (23 Nov 17 - 2 Dec 17) - v001 approval

Mon Nov 13 08:59:29 EST 2017

All, 

Note: Angle at orbit 389 apogee after the perigee sun precession maneuver: 5.020 deg 

I have looked at the orbit 388 ATS, 

IBEX_2017_327_o0388a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_327_o0388a_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_327_o0388a_v002.stf. 

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_327_o0388a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts a few hours after apogee and runs until perigee. The second occurs after perigee and is only about two hours in duration. Some despinning may be required due to the first outage. 

The is one moon in Lo FOV session in arc A. The ATS start time is about 5 hours after that in the OEF and the ATS end time is 2+ 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_Orbit388_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 387 left us pointing in safe directions for the orbit 388 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.515795,-0.782244,-0.349357 -w ibex-sun -t 2017/11:24:07:20:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.515795,-0.782244,-0.349357 

which is R.A. +236.600 Decl. -20.448 

missing R.A. +239.892 Decl. -20.578 (ibex-sun) 

error is R.A. +3.292 Decl. +0.130 

for a total 3.086 deg 

ibex_rotate -o -u -0.515795,-0.782244,-0.349357 -w ibex-sun -t 2017/11:27:20:10:15 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.515795,-0.782244,-0.349357 

which is R.A. +236.600 Decl. -20.448 

missing R.A. +243.545 Decl. -21.239 (ibex-sun) 

error is R.A. +6.945 Decl. +0.791 

for a total 6.538 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 -0.444989,-0.817491,-0.36564 -w ibex-sun -t 2017/11:27:21:53:23 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.444989,-0.817491,-0.365640 

which is R.A. +241.439 Decl. -21.447 

missing R.A. +243.621 Decl. -21.251 (ibex-sun) 

error is R.A. +2.182 Decl. +0.196 

for a total 2.041 deg 

ibex_rotate -o -u -0.444989,-0.817491,-0.36564 -w ibex-sun -t 2017/11:27:23:28:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.444989,-0.817491,-0.365640 

which is R.A. +241.439 Decl. -21.447 

missing R.A. +243.690 Decl. -21.262 (ibex-sun) 

error is R.A. +2.251 Decl. +0.185 

for a total 2.105 deg 

ibex_rotate -o -u -0.444989,-0.817491,-0.36564 -w ibex-sun -t 2017/12:02:07:33:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.444989,-0.817491,-0.365640 

which is R.A. +241.439 Decl. -21.447 

missing R.A. +248.415 Decl. -21.930 (ibex-sun) 

error is R.A. +6.976 Decl. +0.483 

for a total 6.499 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 389 apogee: 

ibex_rotate -o -r +248.530 -d -21.948 -w ibex-sun -t 2017/12:02:09:57:09 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.339487,-0.863162,-0.373765 

which is R.A. +248.530 Decl. -21.948 

missing R.A. +248.530 Decl. -21.948 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +248.530 -d -21.948 -w ibex-sun -t 2017-12-07T09:55:36.031Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.339487,-0.863162,-0.373765 

which is R.A. +248.530 Decl. -21.948 

missing R.A. +253.905 Decl. -22.633 (ibex-sun) 

error is R.A. +5.375 Decl. +0.685 

for a total 5.020 deg 

No Lo O-mode. 

There is no overlap with orbit 387 commands by manual inspection or by checking at 

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

Command Approval Checklist is attached. 

Ken 

----- Original Message -----

From: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
To: "Eric Chubin" <Eric.Chubin at OrbitalATK.com>, "Colin Joyce" <cjl46 at wildcats.unh.edu>, "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS" <IBEXOPS at gmail.com>, "ISOC" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <kwfairchild at gmail.com>, "Ken Fairchild" <fair-play at comcast.net>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
Sent: Saturday, November 11, 2017 1:53:15 AM 
Subject: IBEX Orbit# 388 ATS Approval (23 Nov 17 - 2 Dec 17) 

Guys, 

Here are the planning files and ATS for Orbit# 388. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 13 Nov 17 @1800 UTC 

Note the following: 

1. Battery Balancing Commands 

Orbit# 388 PERIGEE: Battery Balancing Commands 

2017-12-02T19:22:31.299Z,Perigee,orbit:388 

SetLongEclipseFlag TRUE $TIME=2017/12:02:18:00:00 

SetLongEclipseFlag FALSE $TIME=2017/12:02:19:30:00 

2. Moon in Lo FOV Commands 

2017-11-24T13:03:48.902Z,MoonInLoFovStart,orbit:388 

2017-11-25T04:10:03.194Z,MoonInLoFovStop,orbit:388 

3. PERIGEE Sun Maneuver 

2017-12-02T09:42:09.000Z,ManeuverWindowStart 

2017-12-02T09:42:09.000Z,SunMvrBegin 

2017-12-02T09:57:09.000Z,SunMvrEnd,orbit:388 

2017-12-02T10:12:11.000Z,ManeuverWindowEnd,orbit:388 

4. Command Load Constraint Violation Report 

IBEX_2017_327_o0388a_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 2017/11/24 05:45:45 UTC 

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

transition to science mode at 2017/11/27 22:58:29 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 

Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication. 
Thank you. 
********************* 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20171113/cb68e1a2/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 2392 bytes
Desc: image001.jpg
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20171113/cb68e1a2/image001-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev16b-o0388_KWF.doc
Type: application/msword
Size: 121344 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20171113/cb68e1a2/IBEX-Command-Approval-Checklist-Rev16b-o0388_KWF-0001.doc>