[Isocops] IBEX ORbit# 383 ATS Approval (8 Oct 17 - 18 Oct 17) - v001 approval

Fri Sep 29 13:13:58 EDT 2017

All, 

I have looked at the orbit 383 ATS, 

IBEX_2017_281_o0383a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_281_o0383a_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_281_o0383a_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_281_o0383a_v001.oef, 

and as verified with ibex_orbit. 

There are no star tracker outages. 

The is one moon in Lo FOV session (there are 2 in the OEF; only 1 in the ATS). The session starts in arc A and ends after we descend at the end of the arc (in the ATS). The ATS start time is almost 10 hours after that in the OEF and the ATS end time is almost 5 hours after that in the OEF (the ATS end time is after the arc A descending sequence). Differences in timing are not unusual. 

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

IBEX_Orbit383_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 382 left us pointing in safe directions for the orbit 383 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.9737,-0.20512,-0.099163 -w ibex-sun -t 2017/10:09:10:00:49 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.973700,-0.205120,-0.099163 

which is R.A. +191.896 Decl. -5.691 

missing R.A. +194.804 Decl. -6.340 (ibex-sun) 

error is R.A. +2.908 Decl. +0.649 

for a total 2.964 deg 

ibex_rotate -o -u -0.9737,-0.20512,-0.099163 -w ibex-sun -t 2017/10:13:03:02:47 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.973700,-0.205120,-0.099163 

which is R.A. +191.896 Decl. -5.691 

missing R.A. +198.102 Decl. -7.700 (ibex-sun) 

error is R.A. +6.206 Decl. +2.009 

for a total 6.483 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 -0.952261,-0.275828,-0.130838 -w ibex-sun -t 2017/10:13:04:45:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.952261,-0.275828,-0.130838 

which is R.A. +196.154 Decl. -7.518 

missing R.A. +198.168 Decl. -7.725 (ibex-sun) 

error is R.A. +2.014 Decl. +0.207 

for a total 2.007 deg 

ibex_rotate -o -u -0.952261,-0.275828,-0.130838 -w ibex-sun -t 2017/10:13:06:21:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.952261,-0.275828,-0.130838 

which is R.A. +196.154 Decl. -7.518 

missing R.A. +198.229 Decl. -7.749 (ibex-sun) 

error is R.A. +2.075 Decl. +0.231 

for a total 2.070 deg 

ibex_rotate -o -u -0.952261,-0.275828,-0.130838 -w ibex-sun -t 2017/10:17:19:30:11 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.952261,-0.275828,-0.130838 

which is R.A. +196.154 Decl. -7.518 

missing R.A. +202.592 Decl. -9.431 (ibex-sun) 

error is R.A. +6.438 Decl. +1.913 

for a total 6.649 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 384 apogee: 

ibex_rotate -o -u -0.924721,-0.345408,-0.15995 -w ibex-sun -t 2017/10:17:22:08:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.924721,-0.345408,-0.159950 

which is R.A. +200.482 Decl. -9.204 

missing R.A. +202.700 Decl. -9.476 (ibex-sun) 

error is R.A. +2.218 Decl. +0.272 

for a total 2.206 deg 

ibex_rotate -o -u -0.924721,-0.345408,-0.15995 -w ibex-sun -t 2017-10-22T20:40:50.842Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.924721,-0.345408,-0.159950 

which is R.A. +200.482 Decl. -9.204 

missing R.A. +207.223 Decl. -11.238 (ibex-sun) 

error is R.A. +6.741 Decl. +2.034 

for a total 6.938 deg 

No Lo O-mode. 

There is no overlap with orbit 382 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: Monday, September 25, 2017 8:00:09 PM 
Subject: IBEX ORbit# 383 ATS Approval (8 Oct 17 - 18 Oct 17) 

Guys, 

Here are the planning files and ATS for Orbit# 383. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 28 Sept 17 @1600 UTC 

Note the following: 

1. Battery Balancing at Perigee 

# Orbit# 383 PERIGEE: Battery Balancing Commands 

# 2017-10-18T06:35:13.890Z,Perigee,orbit:383 

SetLongEclipseFlag TRUE $TIME=2017/10:18:02:00:00 

SetLongEclipseFlag FALSE $TIME=2017/10:18:03:30:00 

2. Moon in Lo FOV commands 

# 2017-10-11T18:04:26.548Z,MoonInLoFovStart,orbit:383 

# 2017-10-12T23:25:25.518Z,MoonInLoFovStop,orbit:383 

3. Command Load Constraint Violation Report 

IBEX_2017_281_o0383a_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 2017/10/09 08:08:54 UTC 

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

transition to science mode at 2017/10/13 05:51:01 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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