[Isocops] IBEX Orbit# 273 ATS Approval (12 Jan 15 - 21 Jan 15) - v001 approval

Wed Dec 31 13:31:04 EST 2014

All, 

I have looked at the orbit 273 ATS, 

IBEX_2015_012_o0273a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2015_012_o0273a_v001.ccvr. 

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

IBEX_2015_012_o0273a_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_2015_012_o0273a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 1 1/2 days after 15 Re ascending and ends almost 14 hours after apogee (delaying the apogee maneuver). Some despinning may be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is 2+ hours after that in the OEF and the ATS end time is 3 hours before that in the OEF. These differences are not unusual. The OEF shows a second session in arc B. This session does not appear in the STF (not unusual) and commands would not be generated for it anyway as the part of the session after we ascend is too short. 

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

IBEX_Orbit273Contacts.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 272 left us pointing in safe directions for the orbit 273 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015/01:12:19:39:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.388285,-0.874648,-0.290218 

which is R.A. +293.938 Decl. -16.871 

missing R.A. +293.880 Decl. -21.631 (ibex-sun) 

error is R.A. +0.058 Decl. +4.760 

for a total 4.760 deg 

ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015/01:17:20:27:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.388285,-0.874648,-0.290218 

which is R.A. +293.938 Decl. -16.871 

missing R.A. +299.208 Decl. -20.754 (ibex-sun) 

error is R.A. +5.270 Decl. +3.883 

for a total 6.320 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 0.453254,-0.846806,-0.278354 -w ibex-sun -t 2015/01:17:22:13:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.453254,-0.846806,-0.278354 

which is R.A. +298.158 Decl. -16.162 

missing R.A. +299.285 Decl. -20.739 (ibex-sun) 

error is R.A. +1.127 Decl. +4.577 

for a total 4.700 deg 

ibex_rotate -o -u 0.453254,-0.846806,-0.278354 -w ibex-sun -t 2015/01:17:23:46:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.453254,-0.846806,-0.278354 

which is R.A. +298.158 Decl. -16.162 

missing R.A. +299.352 Decl. -20.726 (ibex-sun) 

error is R.A. +1.194 Decl. +4.564 

for a total 4.703 deg 

ibex_rotate -o -u 0.453254,-0.846806,-0.278354 -w ibex-sun -t 2015/01:21:01:32:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.453254,-0.846806,-0.278354 

which is R.A. +298.158 Decl. -16.162 

missing R.A. +302.624 Decl. -20.048 (ibex-sun) 

error is R.A. +4.466 Decl. +3.886 

for a total 5.754 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 274 apogee: 

ibex_rotate -o -u 0.533053,-0.80511,-0.2601 -w ibex-sun -t 2015/01:21:03:42:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.533053,-0.805110,-0.260100 

which is R.A. +303.508 Decl. -15.076 

missing R.A. +302.724 Decl. -20.026 (ibex-sun) 

error is R.A. +0.784 Decl. +4.950 

for a total 5.006 deg 

ibex_rotate -o -u 0.533053,-0.80511,-0.2601 -w ibex-sun -t 2015-01-26T03:47:13.160Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.533053,-0.805110,-0.260100 

which is R.A. +303.508 Decl. -15.076 

missing R.A. +308.012 Decl. -18.892 (ibex-sun) 

error is R.A. +4.504 Decl. +3.816 

for a total 5.754 deg 

Lo O-mode in all of arc B (plan 6,7,1,1). There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 

There is no overlap with orbit 272 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: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Marty Quinn" <marty.quinn at unh.edu>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Tuesday, December 30, 2014 2:09:00 PM 
Subject: IBEX Orbit# 273 ATS Approval (12 Jan 15 - 21 Jan 15) 

Guys, 
Here are the planning files and ATS for Orbit# 273. Please respond to this email thread with questions and your approvals. 
Approvals are required before 2 Jan15 @ 0000 UTC 
Note the following: 
1. No Battery Balancing commands at PERIGEE this orbit 
2. Moon in Lo FOV 
2015-01-16T10:35:13.513Z,MoonInLoFovStart,orbit:273 
2015-01-17T18:01:59.643Z,MoonInLoFovStop,orbit:273 
3. IBEX_Lo O-mode (cross calibration) Commands during arc-b of the orbit 
4. Command Load Constraint Violation Report 
IBEX_2015_012_o0273a_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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