[Isocops] IBEX Orbit# 281 ATS (26 Mar 15 - 4 Apr 15) - v001 approval

Fri Mar 13 23:05:48 EDT 2015

All, 

Note: Angle at apogee after the perigee sun precession maneuver: 4.908 deg 

I have looked at the orbit 281 ATS, 

IBEX_2015_085_o0281a_v001.scr, 

and I approve. 

The constraint violation in 

IBEX_2015_085_o0281a_v001.ccvr 

is related to the eclipse in orbit 280 and isn't a problem. 

The PL commands in the v001 ATS match those in the v002 STF, 

IBEX_2015_085_o0281a_v002.stf, 

except that the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass. 

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_085_o0281a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages but they overlap causing one continuous outage. The outage starts 2+ days after apogee and ends after perigee. 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 about 7 1/2 hours after that in the OEF and the ATS end time is about 3 1/2 hours after 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_Orbit281Contacts.txt, 

for all contacts (4) . 

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

The inertial maneuver at perigee of orbit 280 left us pointing in safe directions for the orbit 281 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.998488,0.053534,0.012496 -w ibex-sun -t 2015/03:27:03:07:13 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998488,+0.053534,+0.012496 

which is R.A. +3.069 Decl. +0.716 

missing R.A. +5.457 Decl. +2.351 (ibex-sun) 

error is R.A. +2.388 Decl. +1.635 

for a total 2.893 deg 

ibex_rotate -o -u 0.998488,0.053534,0.012496 -w ibex-sun -t 2015/03:30:16:46:32 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998488,+0.053534,+0.012496 

which is R.A. +3.069 Decl. +0.716 

missing R.A. +8.790 Decl. +3.753 (ibex-sun) 

error is R.A. +5.721 Decl. +3.037 

for a total 6.473 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 0.991069,0.126045,0.043532 -w ibex-sun -t 2015/03:30:18:29:40 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991069,+0.126045,+0.043532 

which is R.A. +7.248 Decl. +2.495 

missing R.A. +8.855 Decl. +3.781 (ibex-sun) 

error is R.A. +1.607 Decl. +1.286 

for a total 2.056 deg 

ibex_rotate -o -u 0.991069,0.126045,0.043532 -w ibex-sun -t 2015/03:30:20:04:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991069,+0.126045,+0.043532 

which is R.A. +7.248 Decl. +2.495 

missing R.A. +8.915 Decl. +3.806 (ibex-sun) 

error is R.A. +1.667 Decl. +1.311 

for a total 2.119 deg 

ibex_rotate -o -u 0.991069,0.126045,0.043532 -w ibex-sun -t 2015/04:04:06:20:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.991069,+0.126045,+0.043532 

which is R.A. +7.248 Decl. +2.495 

missing R.A. +12.8 23 Decl. +5.509 (ibex-sun) 

error is R.A. +5.575 Decl. +3.014 

for a total 6.325 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 282 apogee: 

ibex_rotate -o -r +12.910 -d +5.545 -w ibex-sun -t 2015/04:04:08:42:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.970161,+0.222375,+0.096628 

which is R.A. +12.910 Decl. +5.545 

missing R.A. +12.910 Decl. +5.545 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.000 deg 

ibex_rotate -o -r +12.910 -d +5.545 -w ibex-sun -t 2015-04-09T05:24:22.570Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.970161,+0.222375,+0.096628 

which is R.A. +12.910 Decl. +5.545 

missing R.A. +17.488 Decl. +7.388 (ibex-sun) 

error is R.A. +4.578 Decl. +1.843 

for a total 4.908 deg 

No Lo O-mode. 

There is no overlap with orbit 280 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: "David Heirtzler" <dheirtzl at atlas.sr.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" <robert.lockwood at orbitalatk.com>, "Ryan Tyler" <ryan.tyler at orbitalatk.com>, "Sheral Wesley" <sheral.wesley at orbitalatk.com>, "Tim Perry" <tim.perry at orbitalatk.com> 
Sent: Thursday, March 12, 2015 1:48:08 PM 
Subject: IBEX Orbit# 281 ATS (26 Mar 15 - 4 Apr 15) 

Guys, 
Here are the planning files and ATS for Orbit# 281. 
Please respond to this email thread with your questions and approvals. 
Approvals are required before 16 Mar 15 @ 1400 UTC 
Note the following: 
1. no battery balancing this orbit 
2. Moon in Lo FOV 
# 2015-03-27T07:47:11.611Z,MoonInLoFovStart,orbit:281 
# 2015-03-28T07:23:47.790Z,MoonInLoFovStop,orbit:281 
3. Perigee Sun Maneuver 
# 2015-04-03T08:47:29.570Z,StarTrackerOutageStart,dueTo:moon,orbit:281 
# 2015-04-05T04:17:00.000Z,StarTrackerOutageStop,dueTo:moon,orbit:281 
4. Command Load Constraint Violation Report 
IBEX_2015_085_o0281a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2015/03/26 22:34:54 UTC - 
2015/03/26 22:37:54 UTC. Lowest charge level is 8053.895202 
watt-minutes during this interval. 
* Eclipse in Orbit# 280 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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