[Isocops] IBEX ORbit# 363 ATS (10 Apr 17 - 19 Apr 17) - v001 approval

Thu Mar 30 00:55:23 EDT 2017

All, 

Note: Angle at orbit 363 arc B descending sequence after apogee sun precession maneuver: 3.718 deg 

I have looked at the orbit 363 ATS, 

IBEX_2017_100_o0363a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2017_100_o0363a_v001.ccvr 

are due to the proximity of the two contacts on 4/19 and from the removal of the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2017_100_o0363a_v002.stf, 

except that the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for a 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_2017_100_o0363a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts in orbit 362 and ends 1 1/2+ days after apogee. Some despinning may be required due to this outage. 

There are no moon in Lo FOV sessions. 

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

IBEX_Orbit363_Contacts.txt, 

for all contacts (4). 

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

The sun precession maneuver at perigee of orbit 362 left us pointing in safe directions for the orbit 363 arc A ascending and descending sequences: 

ibex_rotate -o -r +18.658 -d +7.917 -w ibex-sun -t 2017/04:11:00:36:21 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.938415,+0.316869,+0.137738 

which is R.A. +18.658 Decl. +7.917 

missing R.A. +19.482 Decl. +8.207 (ibex-sun) 

error is R.A. +0.824 Decl. +0.290 

for a total 0.866 deg 

ibex_rotate -o -r +18.658 -d +7.917 -w ibex-sun -t 2017/04:14:22:03:47 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.938415,+0.316869,+0.137738 

which is R.A. +18.658 Decl. +7.917 

missing R.A. +23.184 Decl. +9.658 (ibex-sun) 

error is R.A. +4.526 Decl. +1.741 

for a total 4.799 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 +23.253 -d +9.686 -w ibex-sun -t 2017/04:14:23:51:55 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.905673,+0.389164,+0.168249 

which is R.A. +23.253 Decl. +9.686 

missing R.A. +23.253 Decl. +9.686 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +23.253 -d +9.686 -w ibex-sun -t 2017/04:15:01:22:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.905673,+0.389164,+0.168249 

which is R.A. +23.253 Decl. +9.686 

missing R.A. +23.311 Decl. +9.709 (ibex-sun) 

error is R.A. +0.058 Decl. +0.023 

for a total 0.061 deg 

ibex_rotate -o -r +23.253 -d +9.686 -w ibex-sun -t 2017/04:18:21:44:23 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.905673,+0.389164,+0.168249 

which is R.A. +23.253 Decl. +9.686 

missing R.A. +26.762 Decl. +11.068 (ibex-sun) 

error is R.A. +3.509 Decl. +1.382 

for a total 3.718 deg 

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 364 apogee: 

ibex_rotate -o -u 0.890695,0.420801,0.172015 -w ibex-sun -t 2017/04:18:23:58:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.890695,+0.420801,+0.172015 

which is R.A. +25.288 Decl. +9.905 

missing R.A. +26.843 Decl. +11.096 (ibex-sun) 

error is R.A. +1.555 Decl. +1.191 

for a total 1.938 deg 

ibex_rotate -o -u 0.890695,0.420801,0.172015 -w ibex-sun -t 2017-04-23T19:09:47.008Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.890695,+0.420801,+0.172015 

which is R.A. +25.288 Decl. +9.905 

missing R.A. +31.455 Decl. +12.721 (ibex-sun) 

error is R.A. +6.167 Decl. +2.816 

for a total 6.670 deg 

No Lo O-mode. 

There is no overlap with orbit 362 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: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
To: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com>, "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>, "Ken Fairchild" <kwfairchild at gmail.com>, "Robert Lockwood" <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>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com> 
Sent: Tuesday, March 28, 2017 2:52:21 PM 
Subject: IBEX ORbit# 363 ATS (10 Apr 17 - 19 Apr 17) 

Guys, 

Here are the planning files and ATS for Orbit# 363. 

Please respond to this email thread with your comments and approvals 

Approvals are required before 31 Mar @1200 UTC 

Note the following: 

1. APL-18 SSR_Dump Contact for Orbit# 362 

SetRelay stx,on $TIME=2017/04:11:00:58:00 

SetDownlink2K $TIME=2017/04:11:00:58:02 

SetBilevelOutputControlReg STXMODE_Strobe,ON $TIME=2017/04:11:00:58:04 

SetBilevelOutputControlReg COHERENT,ON $TIME=2017/04:11:00:58:06 

SetDownlink320K $TIME=2017/04:11:01:05:00 

SSR_DUMP_NEW $TIME=2017/04:11:01:10:00 

SetRelay stx,off $TIME=2017/04:11:02:02:00 

2. Apogee Sun Maneuver 

2017-04-14T23:36:55.000Z,SunMvrBegin,orbit:363 

2017-04-14T23:37:27.783Z,Apogee,orbit:363 

2017-04-14T23:51:55.000Z,SunMvrEnd,orbit:363 

3. Command Load Constraint Violation Report 

IBEX_2017_100_o0363a_v001.scr 

========================== 

HARD CONSTRAINT VIOLATIONS 

========================== 

NO VIOLATIONS. 

========================== 

SOFT CONSTRAINT VIOLATIONS 

========================== 

IBX-CLC-006: Planned transmission at 2017/04/19 07:58:00 UTC - 2017/04/19 

09:02:00 UTC is followed by one or more additional transmissions 

which, when combined, exceed the maximum transmission time of 5400 

seconds within a 18000-second window (total planned transmission 

time this window is 7680.000 seconds) 

IBX-CLC-006: Planned transmission at 2017/04/19 12:58:00 UTC - 2017/04/19 

14:02:00 UTC is preceded by one or more additional transmissions 

which, when combined, exceed the maximum transmission time of 5400 

seconds within a 18000-second window (total planned transmission 

time this window is 7680.000 seconds) 

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

transition to science mode at 2017/04/10 23:00:01 UTC 

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

transition to science mode at 2017/04/15 00:52:01 UTC 

============== 

OTHER MESSAGES 

============== 

NO MESSAGES. 

Sheral R. Wesley 

Sr Systems Engineer 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 

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Thank you. 
********************* 

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