[Isocops] IBEX Orbit# 381 ATS Approval (20 Sept 17 - 29 Sept 17) - v001 approval

Fri Sep 8 09:04:13 EDT 2017

All, 

I have looked at the orbit 381 ATS, 

IBEX_2017_263_o0381a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_263_o0381a_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_263_o0381a_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_263_o0381a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 2 hours before 15 Re ascending and ends just after 15 Re ascending. Despinning should not be required due to this outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is one hour after that in the OEF and the ATS end time is about an hour 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_Orbit381_Contacts.txt, 

for all contacts (4). 

No battery cell balancing this orbit; we'll do it again in the next orbit. 

The inertial maneuver at perigee of orbit 380 left us pointing in safe directions for the orbit 381 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.996542,0.07948,0.02424 -w ibex-sun -t 2017/09:21:03:39:27 

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. +178.266 Decl. +0.733 (ibex-sun) 

error is R.A. +2.826 Decl. +0.656 

for a total 2.900 deg 

ibex_rotate -o -u -0.996542,0.07948,0.02424 -w ibex-sun -t 2017/09:24:19:00:15 

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. +181.434 Decl. -0.649 (ibex-sun) 

error is R.A. +5.994 Decl. +2.038 

for a total 6.331 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 -0.999935,0.008482,-0.007557 -w ibex-sun -t 2017/09:24:20:43:23 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.999935,+0.008482,-0.007557 

which is R.A. +179.514 Decl. -0.433 

missing R.A. +181.499 Decl. -0.676 (ibex-sun) 

error is R.A. +1.985 Decl. +0.243 

for a total 2.000 deg 

ibex_rotate -o -u -0.999935,0.008482,-0.007557 -w ibex-sun -t 2017/09:24:22:18:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.999935,+0.008482,-0.007557 

which is R.A. +179.514 Decl. -0.433 

missing R.A. +181.559 Decl. -0.701 (ibex-sun) 

error is R.A. +2.045 Decl. +0.268 

for a total 2.062 deg 

ibex_rotate -o -u -0.999935,0.008482,-0.007557 -w ibex-sun -t 2017/09:29:09:03:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.999935,+0.008482,-0.007557 

which is R.A. +179.514 Decl. -0.433 

missing R.A. +185.695 Decl. -2.438 (ibex-sun) 

error is R.A. +6.181 Decl. +2.005 

for a total 6.496 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 382 apogee: 

ibex_rotate -o -u -0.997249,-0.06372,-0.037865 -w ibex-sun -t 2017/09:29:11:33:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.997249,-0.063720,-0.037865 

which is R.A. +183.656 Decl. -2.170 

missing R.A. +185.792 Decl. -2.483 (ibex-sun) 

error is R.A. +2.136 Decl. +0.313 

for a total 2.157 deg 

ibex_rotate -o -u -0.997249,-0.06372,-0.037865 -w ibex-sun -t 2017-10-04T09:27:13.960Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.997249,-0.063720,-0.037865 

which is R.A. +183.656 Decl. -2.170 

missing R.A. +190.105 Decl. -4.371 (ibex-sun) 

error is R.A. +6.449 Decl. +2.201 

for a total 6.804 deg 

No Lo O-mode. 

There is no overlap with orbit 380 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>, "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: Wednesday, September 6, 2017 7:58:21 PM 
Subject: IBEX Orbit# 381 ATS Approval (20 Sept 17 - 29 Sept 17) 

Guys, 

Here are the planning and ATS files for Orbit# 381. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 8 Sept @1900 UTC 

Note the following: 

1. IBEX_Lo Normal Sweep Table Load Contact 

IBEX,USAK01,ADD,09/21/17,264,04:15:00,09/21/17,264,05:15:00,,LAHO 40K IBEX-2 Orbit# 380 Tracking/Normal Sweep Table Load Contact(15 asc) 

2. Moon in Lo FOV Commands 

2017-09-28T17:39:30.417Z,MoonInLoFovStart,orbit:381 

2017-09-29T07:23:10.899Z,MoonInLoFovStop,orbit:381 

3. Command Load Constraint Violation Report 

IBEX_2017_263_o0381a_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 2017/09/21 01:46:52 UTC 

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

transition to science mode at 2017/09/24 21:48:29 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. 
********************* 

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