[Isocops] IBEX Orbit# 232 ATS (4 Jan 14 - 13 Jan 14) - v001 approval

Mon Dec 23 23:46:39 EST 2013

All, 

I have looked at the orbit 232 ATS, 

IBEX_2014_004_o0232a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_004_o0232a_v001.ccvr. 

The PL commands in the v001 ATS match those in the v003 STF, 

IBEX_2014_004_o0232a_v003.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_004_o0232a_v001.oef, 

and as verified with ibex_orbit. 

The Hi ABAB command sequences and timing look reasonable. 

There are two star tracker outages. The first outage starts about 16 1/2 hours after 15 Re ascending and runs for about a day and a half. The second starts 2+ days after apogee and ends after we descend. Some despinning may be required due to these outages. 

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

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

IBEX_Orbit232Contacts.txt, 

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

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 231 left us pointing in safe directions for orbit 232 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.257068,-0.844045,-0.470642 -w ibex-sun -t 2014/01:05:08:35:39 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.257068,-0.844045,-0.470642 
which is R.A. +286.939 Decl. -28.076 
missing R.A. +286.025 Decl. -22.624 (ibex-sun) 
error is R.A. +0.914 Decl. +5.452 
for a total 5.514 deg 

ibex_rotate -o -u 0.257068,-0.844045,-0.470642 -w ibex-sun -t 2014/01:08:19:36:15 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.257068,-0.844045,-0.470642 
which is R.A. +286.939 Decl. -28.076 
missing R.A. +289.729 Decl. -22.234 (ibex-sun) 
error is R.A. +2.790 Decl. +5.842 
for a total 6.364 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 0.328832,-0.823598,-0.46212 -w ibex-sun -t 2014/01:08:21:19:23 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.328832,-0.823598,-0.462120 
which is R.A. +291.765 Decl. -27.524 
missing R.A. +289.805 Decl. -22.224 (ibex-sun) 
error is R.A. +1.960 Decl. +5.300 
for a total 5.590 deg 

ibex_rotate -o -u 0.328832,-0.823598,-0.46212 -w ibex-sun -t 2014/01:08:22:54:29 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.328832,-0.823598,-0.462120 
which is R.A. +291.765 Decl. -27.524 
missing R.A. +289.876 Decl. -22.215 (ibex-sun) 
error is R.A. +1.889 Decl. +5.309 
for a total 5.578 deg 

ibex_rotate -o -u 0.328832,-0.823598,-0.46212 -w ibex-sun -t 2014/01:13:05:10:16 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.328832,-0.823598,-0.462120 
which is R.A. +291.765 Decl. -27.524 
missing R.A. +294.508 Decl. -21.525 (ibex-sun) 
error is R.A. +2.743 Decl. +5.999 
for a total 6.497 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 233 apogee: 

ibex_rotate -o -u 0.411114,-0.793492,-0.448726 -w ibex-sun -t 2014/01:13:07:07:55 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.411114,-0.793492,-0.448726 
which is R.A. +297.389 Decl. -26.662 
missing R.A. +294.602 Decl. -21.509 (ibex-sun) 
error is R.A. +2.787 Decl. +5.153 
for a total 5.746 deg 

ibex_rotate -o -u 0.411114,-0.793492,-0.448726 -w ibex-sun -t 2014-01-18T05:17:26.528Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.411114,-0.793492,-0.448726 
which is R.A. +297.389 Decl. -26.662 
missing R.A. +299.881 Decl. -20.636 (ibex-sun) 
error is R.A. +2.492 Decl. +6.026 
for a total 6.444 deg 

No Lo O-mode. 

There is no overlap with orbit 231 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: "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>, "Ed Fleming" <Fleming.Ed at orbital.com> 
Sent: Sunday, December 22, 2013 6:52:29 PM 
Subject: IBEX Orbit# 232 ATS (4 Jan 14 - 13 Jan 14) 

Guys, 
Here are the planning files and ATS for ORbit# 232. 
Please respond to this email thread with any questions, comments and ATS approvals. 
All approvals are required before 25 Dec 13 @ 1800 UTC 

Note the following: 

1. IBEX_Hi ABAB Testing 
Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 
2. Moon in IBEX_Lo FOV 
# 2014-01-05T18:45:46.525Z,MoonInLoFovStart,orbit:232 
# 2014-01-06T09:02:44.473Z,MoonInLoFovStop,orbit:232 
3. Battery Balancing at PERIGEE 
SetLongEclipseFlag TRUE $TIME=2014/01:13:16:00:00 
SetLongEclipseFlag FALSE $TIME=2014/01:13:17:30:00 
4. Only APOGEE ground contact commands 
5. PERIGEE ground contacts will be Blind_Acq contacts 

-- 

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