[Isocops] IBEX ORbit# 356 ATS Approval (5 Feb 17 - 15 Feb 17) - v001 approval

Thu Jan 26 14:22:44 EST 2017

All, 

I have looked at the orbit 356 ATS, 

IBEX_2017_036_o0356a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_036_o0356a_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

The PL commands in the v001 ATS match those in the v003 STF, 

IBEX_2017_036_o0356a_v003.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_036_o0356a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 17 hours before apogee and runs for almost 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_Orbit356_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 355 left us pointing in safe directions for the orbit 356 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.738917,-0.573494,-0.353703 -w ibex-sun -t 2017/02:06:11:03:17 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.738917,-0.573494,-0.353703 

which is R.A. +322.184 Decl. -20.714 

missing R.A. +320.096 Decl. -15.561 (ibex-sun) 

error is R.A. +2.088 Decl. +5.153 

for a total 5.522 deg 

ibex_rotate -o -u 0.738917,-0.573494,-0.353703 -w ibex-sun -t 2017/02:09:17:30:51 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.738917,-0.573494,-0.353703 

which is R.A. +322.184 Decl. -20.714 

missing R.A. +323.390 Decl. -14.533 (ibex-sun) 

error is R.A. +1.206 Decl. +6.181 

for a total 6.287 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 0.747284,-0.605873,-0.272918 -w ibex-sun -t 2017/02:09:19:13:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.747284,-0.605873,-0.272918 

which is R.A. +320.966 Decl. -15.838 

missing R.A. +323.460 Decl. -14.509 (ibex-sun) 

error is R.A. +2.494 Decl. +1.329 

for a total 2.749 deg 

ibex_rotate -o -u 0.747284,-0.605873,-0.272918 -w ibex-sun -t 2017/02:09:20:49:05 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.747284,-0.605873,-0.272918 

which is R.A. +320.966 Decl. -15.838 

missing R.A. +323.524 Decl. -14.487 (ibex-sun) 

error is R.A. +2.558 Decl. +1.351 

for a total 2.814 deg 

ibex_rotate -o -u 0.747284,-0.605873,-0.272918 -w ibex-sun -t 2017/02:14:20:07:36 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.747284,-0.605873,-0.272918 

which is R.A. +320.966 Decl. -15.838 

missing R.A. +328.301 Decl. -12.810 (ibex-sun) 

error is R.A. +7.335 Decl. +3.028 

for a total 7.724 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 357 apogee: 

ibex_rotate -o -u 0.838433,-0.453812,-0.301804 -w ibex-sun -t 2017/02:14:22:25:25 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838433,-0.453812,-0.301804 

which is R.A. +331.575 Decl. -17.566 

missing R.A. +328.396 Decl. -12.778 (ibex-sun) 

error is R.A. +3.179 Decl. +4.788 

for a total 5.686 deg 

ibex_rotate -o -u 0.838433,-0.453812,-0.301804 -w ibex-sun -t 2017-02-19T22:01:17.153Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838433,-0.453812,-0.301804 

which is R.A. +331.575 Decl. -17.566 

missing R.A. +333.321 Decl. -11.041 (ibex-sun) 

error is R.A. +1.746 Decl. +6.525 

for a total 6.741 deg 

Lo O-mode in arc A (plan 6, 7, 1, 1). O-mode timing matches that specified in the ISN season memo. There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 

There is no overlap with orbit 355 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: "Sheral Wesley" <Sheral.Wesley 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" <fair-play at comcast.net>, "Ken Fairchild" <kwfairchild at gmail.com>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Michelle Reno" <mreno at swri.edu>, "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> 
Sent: Tuesday, January 24, 2017 2:22:30 PM 
Subject: IBEX ORbit# 356 ATS Approval (5 Feb 17 - 15 Feb 17) 

Guys, 

Here are the products and ATS for Orbit# 356. 

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

Approvals are required before 26 Jan 17 @ 1800 UTC 

Note the following: 

1. O-mode Start/Stop Commands 

Lo O-mode (cross calibration) 

2. Battery Balancing 

# 2017-02-15T07:46:55.423Z,Perigee,orbit:356 

SetLongEclipseFlag TRUE $TIME=2017/02:15:07:00:00 

SetLongEclipseFlag FALSE $TIME=2017/02:15:08:30:00 

3. Command Load Constraint Violation Report 

IBEX_2017_036_o0356a_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 2017/02/06 09:30:53 UTC 

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

transition to science mode at 2017/02/09 20:19:05 UTC 

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

OTHER MESSAGES 

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

NO MESSAGES. 

Sheral R. Wesley 

IBEX 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 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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