[Isocops] IBEX ORbit# 338 ATS Approval (25 Aug 16 - 3 Sept 16) - v001 approval

Tue Aug 16 10:49:12 EDT 2016

All, 

I have looked at the orbit 338 ATS, 

IBEX_2016_238_o0338a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_238_o0338a_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 v002 STF, 

IBEX_2016_238_o0338a_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_2016_238_o0338a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts about 1 hour after perigee and runs for about 7 1/4 hours. No despinning should be required due to this outage. 

There is one moon in Lo FOV session in arc A. The OEF does not have the session start and stop commands - probably because it's a very short session - just over 1 hour. 

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

IBEX_Orbit338_Contacts.txt, 

for all contacts (3). 

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

The inertial maneuver at perigee of orbit 337 left us pointing in safe directions for the orbit 338 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.870501,0.455319,0.18685 -w ibex-sun -t 2016/08:26:09:07:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.870501,+0.455319,+0.186850 
which is R.A. +152.388 Decl. +10.769 
missing R.A. +155.227 Decl. +10.277 (ibex-sun) 
error is R.A. +2.839 Decl. +0.492 
for a total 2.834 deg 

ibex_rotate -o -u -0.870501,0.455319,0.18685 -w ibex-sun -t 2016/08:29:21:10:22 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.870501,+0.455319,+0.186850 
which is R.A. +152.388 Decl. +10.769 
missing R.A. +158.372 Decl. +9.044 (ibex-sun) 
error is R.A. +5.984 Decl. +1.725 
for a total 6.142 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 -0.904707,0.394862,0.159967 -w ibex-sun -t 2016/08:29:22:53:30 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.904707,+0.394862,+0.159967 
which is R.A. +156.421 Decl. +9.205 
missing R.A. +158.438 Decl. +9.019 (ibex-sun) 
error is R.A. +2.017 Decl. +0.186 
for a total 2.000 deg 

ibex_rotate -o -u -0.904707,0.394862,0.159967 -w ibex-sun -t 2016/08:30:00:28:36 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.904707,+0.394862,+0.159967 
which is R.A. +156.421 Decl. +9.205 
missing R.A. +158.499 Decl. +8.995 (ibex-sun) 
error is R.A. +2.078 Decl. +0.210 
for a total 2.062 deg 

ibex_rotate -o -u -0.904707,0.394862,0.159967 -w ibex-sun -t 2016/09:03:09:01:56 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.904707,+0.394862,+0.159967 
which is R.A. +156.421 Decl. +9.205 
missing R.A. +162.557 Decl. +7.424 (ibex-sun) 
error is R.A. +6.136 Decl. +1.781 
for a total 6.327 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 339 apogee: 

ibex_rotate -o -u -0.934776,0.329645,0.132395 -w ibex-sun -t 2016/09:03:11:13:34 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.934776,+0.329645,+0.132395 
which is R.A. +160.575 Decl. +7.608 
missing R.A. +162.640 Decl. +7.389 (ibex-sun) 
error is R.A. +2.065 Decl. +0.219 
for a total 2.059 deg 

ibex_rotate -o -u -0.934776,0.329645,0.132395 -w ibex-sun -t 2016-09-08T06:55:35.303Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.934776,+0.329645,+0.132395 
which is R.A. +160.575 Decl. +7.608 
missing R.A. +166.873 Decl. +5.594 (ibex-sun) 
error is R.A. +6.298 Decl. +2.014 
for a total 6.572 deg 

No Lo O-mode. 

There is no overlap with orbit 337 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: "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
To: "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>, "Lockwood.Robert" <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>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Friday, August 12, 2016 8:21:48 PM 
Subject: IBEX ORbit# 338 ATS Approval (25 Aug 16 - 3 Sept 16) 

Guys, 

Here are the planning files and ATS for Orbit# 338. 

Please respond to this email thread with your questions and approvals 

Approvals are required before 15 Aug 16 @2000 UTC 

Note the following: 

1. No Battery Balancing this PERIGEE 

2. Moon in Lo Fov commands generated by ISOC and not found in the OEF 

# Moon (far at 47.8) in FOV session[0] begins: 

2016-08-26T10:31:14.000Z||CEU_LO_PMT_LVL 300 

2016-08-26T10:31:16.000Z||CEU_LO_IF_STAR_ADJ 0 

# Moon (far at 47.8) in FOV session[0] ends: 

2016-08-26T11:42:50.000Z||CEU_LO_IF_STAR_ADJ 250 

2016-08-26T11:42:52.000Z||CEU_LO_PMT_LVL 800 

3. Command Load Constraint Violation Report 

IBEX_2016_238_o0338a_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 2016/08/26 07:43:31 UTC 

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

transition to science mode at 2016/08/29 23:58:36 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 

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