[Isocops] IBEX Orbit# 392 ATS Approval (30 Dec 17 - 8 Jan18) - v003 approval

Mon Dec 18 12:41:12 EST 2017

All, 

Note: Angle at orbit 392 arc B descending after the apogee sun precession maneuver: 4.131 deg 

I have looked at the orbit 392 ATS, 

IBEX_2017_364_o0392a_v003.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_364_o0392a_v002.ccvr 

are from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

The PL commands in the v003 ATS match those in the v002 STF, 

IBEX_2017_363_o0392a_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, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF, 

IBEX_2017_364_o0392a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 2 1/2 days before apogee and runs for 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_Orbit392_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 391 left us pointing in safe directions for the orbit 392 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.163042,-0.901094,-0.401804 -w ibex-sun -t 2017/12:30:11:51:21 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.163042,-0.901094,-0.401804 

which is R.A. +280.256 Decl. -23.691 

missing R.A. +279.539 Decl. -23.171 (ibex-sun) 

error is R.A. +0.717 Decl. +0.520 

for a total 0.839 deg 

ibex_rotate -o -u 0.163042,-0.901094,-0.401804 -w ibex-sun -t 2018/01:03:12:10:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.163042,-0.901094,-0.401804 

which is R.A. +280.256 Decl. -23.691 

missing R.A. +283.914 Decl. -22.840 (ibex-sun) 

error is R.A. +3.658 Decl. +0.851 

for a total 3.467 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 +283.995 -d -22.831 -w ibex-sun -t 2018/01:03:13:58:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.222890,-0.894296,-0.388014 

which is R.A. +283.995 Decl. -22.831 

missing R.A. +283.995 Decl. -22.831 (ibex-sun) 

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

for a total 0.001 deg 

ibex_rotate -o -r +283.995 -d -22.831 -w ibex-sun -t 2018/01:03:15:28:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.222890,-0.894296,-0.388014 

which is R.A. +283.995 Decl. -22.831 

missing R.A. +284.063 Decl. -22.824 (ibex-sun) 

error is R.A. +0.068 Decl. +0.007 

for a total 0.063 deg 

ibex_rotate -o -r +283.995 -d -22.831 -w ibex-sun -t 2018/01:07:15:35:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.222890,-0.894296,-0.388014 

which is R.A. +283.995 Decl. -22.831 

missing R.A. +288.436 Decl. -22.330 (ibex-sun) 

error is R.A. +4.441 Decl. +0.501 

for a total 4.131 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 393 apogee: 

ibex_rotate -o -u 0.247885,-0.885021,-0.39407 -w ibex-sun -t 2018/01:07:17:52:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.247885,-0.885021,-0.394070 

which is R.A. +285.647 Decl. -23.208 

missing R.A. +288.545 Decl. -22.319 (ibex-sun) 

error is R.A. +2.898 Decl. +0.889 

for a total 2.816 deg 

ibex_rotate -o -u 0.247885,-0.885021,-0.39407 -w ibex-sun -t 2018-01-12T15:26:57.106Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.247885,-0.885021,-0.394070 

which is R.A. +285.647 Decl. -23.208 

missing R.A. +293.909 Decl. -21.636 (ibex-sun) 

error is R.A. +8.262 Decl. +1.572 

for a total 7.796 deg 

No Lo O-mode. 

There is no overlap with orbit 391 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: Friday, December 15, 2017 8:10:44 PM 
Subject: IBEX Orbit# 392 ATS Approval (30 Dec 17 - 8 Jan18) 

Guys, 

Here are the planning files and ATS for Orbit# 392. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 19 Dec 17 @1000 UTC 

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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