[Isocops] IBEX ORbit# 382 ATS Approval (29 Sept 17 - 8 Oct 17) - v001 approval

Mon Sep 18 07:05:37 EDT 2017

All, 

I have looked at the orbit 382 ATS, 

IBEX_2017_272_o0382a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_272_o0382a_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_272_o0382a_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_272_o0382a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts 1 1/2+ days after 15 Re ascending and runs for 1+ 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_Orbit382_Contacts.txt, 

for all contacts (2). 

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

ibex_rotate -o -u -0.997249,-0.06372,-0.037865 -w ibex-sun -t 2017/09:30:07:40:30 

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. +186.520 Decl. -2.838 (ibex-sun) 

error is R.A. +2.864 Decl. +0.668 

for a total 2.938 deg 

ibex_rotate -o -u -0.997249,-0.06372,-0.037865 -w ibex-sun -t 2017/10:03:21:52:58 

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. +189.666 Decl. -4.191 (ibex-sun) 

error is R.A. +6.010 Decl. +2.021 

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 -0.9885,-0.134318,-0.069478 -w ibex-sun -t 2017/10:03:23:36:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.988500,-0.134318,-0.069478 

which is R.A. +187.738 Decl. -3.984 

missing R.A. +189.731 Decl. -4.218 (ibex-sun) 

error is R.A. +1.993 Decl. +0.234 

for a total 2.001 deg 

ibex_rotate -o -u -0.9885,-0.134318,-0.069478 -w ibex-sun -t 2017/10:04:01:11:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.988500,-0.134318,-0.069478 

which is R.A. +187.738 Decl. -3.984 

missing R.A. +189.791 Decl. -4.242 (ibex-sun) 

error is R.A. +2.053 Decl. +0.258 

for a total 2.064 deg 

ibex_rotate -o -u -0.9885,-0.134318,-0.069478 -w ibex-sun -t 2017/10:08:11:39:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.988500,-0.134318,-0.069478 

which is R.A. +187.738 Decl. -3.984 

missing R.A. +193.966 Decl. -5.948 (ibex-sun) 

error is R.A. +6.228 Decl. +1.964 

for a total 6.507 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 383 apogee: 

ibex_rotate -o -u -0.9737,-0.20512,-0.099163 -w ibex-sun -t 2017/10:08:14:15:52 

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. +194.069 Decl. -5.994 (ibex-sun) 

error is R.A. +2.173 Decl. +0.303 

for a total 2.183 deg 

ibex_rotate -o -u -0.9737,-0.20512,-0.099163 -w ibex-sun -t 2017-10-13T14:35:56.079Z 

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. +198.548 Decl. -7.873 (ibex-sun) 

error is R.A. +6.652 Decl. +2.182 

for a total 6.956 deg 

No Lo O-mode. 

There is no overlap with orbit 381 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: Sunday, September 17, 2017 6:01:20 AM 
Subject: IBEX ORbit# 382 ATS Approval (29 Sept 17 - 8 Oct 17) 

Guys, 

Here are the planning products and ATS for Orbit# 382. 

Please respond to this email thread with you comments and approvals 

Approvals are required before 19 Sept 17 @1800 UTC 

Note the following: 

1. Battery Balancing at Perigee 

# Orbit# 382 PERIGEE: Battery Balancing Commands 

# 2017-10-08T22:51:52.450Z,Perigee,orbit:382 

SetLongEclipseFlag TRUE $TIME=2017/10:08:23:00:00 

SetLongEclipseFlag FALSE $TIME=2017/10:09:00:30:00 

2. Command Load Constraint Violation Report 

IBEX_2017_272_o0382a_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 2017/09/30 05:52:30 UTC 

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

transition to science mode at 2017/10/04 00:41:12 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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