[Isocops] IBEX Orbit# 237 ATS v001 (18 Feb 14 - 27 Feb 14) - v001 approval

Fri Feb 7 19:46:31 EST 2014

All, 

I have looked at the orbit 237 ATS, 

IBEX_2014_049_o0237a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_049_o0237a_v001.ccvr. 

The PL commands in the v001 ATS match those in the v004 STF, 

IBEX_2014_049_o0237a_v004.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_2014_049_o0237a_v001.oef, 

and as verified with ibex_orbit. 

The Hi ABAB command sequences and timing look reasonable. The timing of the last Hi "B" commands has been changed so they fall in the same HVENG/HVSCI sequence as the start of Lo O-mode in arc B. 

There is one star tracker outage. It starts 1+ day before apogee and runs for almost 4 days. Some despinning may be required due to this outage. 

This is one moon in Lo FOV session in arc B. The ATS start time is about 1 3/4 hours before that in the OEF and the ATS end time is about 4 hours before that in the OEF. These differences are not unusual. 

The ground station command sequence is correct and the timing and bit rate match those in the contacts file, 

IBEX_Orbit237Contacts.txt, 

for the apogee contact. All other contacts will be blind acquisitions while we are doing Hi ABAB operations. 

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

The inertial maneuver at perigee of orbit 236 left us pointing in safe directions for orbit 237 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.863639,-0.41579,-0.285036 -w ibex-sun -t 2014/02:18:21:03:11 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.863639,-0.415790,-0.285036 
which is R.A. +334.292 Decl. -16.561 
missing R.A. +332.066 Decl. -11.487 (ibex-sun) 
error is R.A. +2.226 Decl. +5.074 
for a total 5.515 deg 

ibex_rotate -o -u 0.863639,-0.41579,-0.285036 -w ibex-sun -t 2014/02:22:17:23:24 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.863639,-0.415790,-0.285036 
which is R.A. +334.292 Decl. -16.561 
missing R.A. +335.751 Decl. -10.132 (ibex-sun) 
error is R.A. +1.459 Decl. +6.429 
for a total 6.584 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 +335.821 -d -10.105 -w ibex-sun -t 2014/02:22:19:11:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.898119,-0.403235,-0.175453 
which is R.A. +335.821 Decl. -10.105 
missing R.A. +335.821 Decl. -10.105 (ibex-sun) 
error is R.A. +0.000 Decl. +0.000 
for a total 0.000 deg 

ibex_rotate -o -r +335.821 -d -10.105 -w ibex-sun -t 2014/02:22:20:41:38 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.898119,-0.403235,-0.175453 
which is R.A. +335.821 Decl. -10.105 
missing R.A. +335.879 Decl. -10.082 (ibex-sun) 
error is R.A. +0.058 Decl. +0.023 
for a total 0.062 deg 

ibex_rotate -o -r +335.821 -d -10.105 -w ibex-sun -t 2014/02:26:17:36:13 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.898119,-0.403235,-0.175453 
which is R.A. +335.821 Decl. -10.105 
missing R.A. +339.479 Decl. -8.636 (ibex-sun) 
error is R.A. +3.658 Decl. +1.469 
for a total 3.897 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 238 apogee: 

ibex_rotate -o -u 0.922468,-0.350671,-0.1615 -w ibex-sun -t 2014/02:26:19:21:35 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.922468,-0.350671,-0.161500 
which is R.A. +339.186 Decl. -9.294 
missing R.A. +339.550 Decl. -8.607 (ibex-sun) 
error is R.A. +0.364 Decl. +0.687 
for a total 0.775 deg 

ibex_rotate -o -u 0.922468,-0.350671,-0.1615 -w ibex-sun -t 2014-03-03T16:08:01.591Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.922468,-0.350671,-0.161500 
which is R.A. +339.186 Decl. -9.294 
missing R.A. +344.200 Decl. -6.768 (ibex-sun) 
error is R.A. +5.014 Decl. +2.526 
for a total 5.570 deg 

Lo O-mode for a 24 hour period in each arc ( plan 6,7,1,1). 

There is no overlap with orbit 236 commands by manual inspection or by checking at 

http://ibex.unh.edu/cgi-bin/ats.cgi . 

Command Approval Checklists are attached. 

Ken 

----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com> 
To: joe at boulder.swri.edu, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Wednesday, February 5, 2014 1:59:42 PM 
Subject: IBEX Orbit# 237 ATS v001 (18 Feb 14 - 27 Feb 14) 

Guys, 
Here are the planning products and ATS for Orbit# 237. 
Please respond to this email thread with approvals and comments. 
All approvals and comments are required before 8 Feb 14 @ 1600 UTC. 

Note the following: 
1. No battery balancing this orbit 
2. Special Ops/Post-LUT Changes 
IBEX_Hi negative collimator voltage set to 1400 
IBEX_Hi ABAB (CEM comparison) 
IBEX_Lo O-mode (cross calibration) 
3. Sun Maneuver at APOGEE 
* Timestamp changed 
ACT_SetKFInputSelect GND_CMD, 0, 0, 0, 0 $TIME=2014/02:26:19:01:35 
ACT_SetEstUpdateEnables ENABLE, DISABLE $TIME=2014/02:26:19:01:36 
4. Command Load Constraint Violation Report 
# IBEX_2014_049_o0237a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 
Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
CYGNUS Mission Planning 
(304) 279-6678 
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