[Isocops] IBEX Orbit # 353 ATS for Approval (9 - 18 Jan 2017) - v001 approval

Ken Fairchild fair-play at comcast.net
Wed Dec 28 12:51:37 EST 2016


All, 

Note: Angle at arc B descending after the apogee sun precession maneuver: 4.299 deg 

I have looked at the orbit 353 ATS, 



IBEX_2017_009_o0353a_v001.scr, 




and I approve. 




The only constraint violations in 




IBEX_2017_009_o0353a_v001.ccvr 




are because we removed the 




ACT_SetSpinPulseProtectEnable Enable 




commands (2); the violations are expected. 


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



IBEX_2017_009_o0353a_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_2017_009_o0353a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. The outage starts 2- days before apogee and ends 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_Orbit353_Contacts.txt, 




for all contacts (2). 




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 352 left us pointing in safe directions for the orbit 353 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.332629,-0.822377,-0.461578 -w ibex-sun -t 2017/01:09:12:20:54 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.332629,-0.822377,-0.461578 

which is R.A. +292.022 Decl. -27.489 

missing R.A. +290.828 Decl. -22.074 (ibex-sun) 

error is R.A. +1.194 Decl. +5.415 

for a total 5.522 deg 




ibex_rotate -o -u 0.332629,-0.822377,-0.461578 -w ibex-sun -t 2017/01:13:16:43:23 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.332629,-0.822377,-0.461578 

which is R.A. +292.022 Decl. -27.489 

missing R.A. +295.320 Decl. -21.428 (ibex-sun) 

error is R.A. +3.298 Decl. +6.061 

for a total 6.763 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 +295.399 -d -21.414 -w ibex-sun -t 2017/01:13:18:31:31 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.399310,-0.840982,-0.365104 

which is R.A. +295.399 Decl. -21.414 

missing R.A. +295.399 Decl. -21.414 (ibex-sun) 

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

for a total 0.000 deg 




ibex_rotate -o -r +295.399 -d -21.414 -w ibex-sun -t 2017/01:13:20:01:37 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.399310,-0.840982,-0.365104 

which is R.A. +295.399 Decl. -21.414 

missing R.A. +295.465 Decl. -21.403 (ibex-sun) 

error is R.A. +0.066 Decl. +0.011 

for a total 0.063 deg 




ibex_rotate -o -r +295.399 -d -21.414 -w ibex-sun -t 2017/01:18:00:32:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.399310,-0.840982,-0.365104 

which is R.A. +295.399 Decl. -21.414 

missing R.A. +299.915 Decl. -20.573 (ibex-sun) 

error is R.A. +4.516 Decl. +0.841 

for a total 4.299 deg 




The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 354 apogee: 




ibex_rotate -o -u 0.485271,-0.759002,-0.434084 -w ibex-sun -t 2017/01:18:02:54:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.485271,-0.759002,-0.434084 

which is R.A. +302.593 Decl. -25.727 

missing R.A. +300.025 Decl. -20.553 (ibex-sun) 

error is R.A. +2.568 Decl. +5.174 

for a total 5.687 deg 




ibex_rotate -o -u 0.485271,-0.759002,-0.434084 -w ibex-sun -t 2017-01-23T03:56:59.884Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.485271,-0.759002,-0.434084 

which is R.A. +302.593 Decl. -25.727 

missing R.A. +305.416 Decl. -19.486 (ibex-sun) 

error is R.A. +2.823 Decl. +6.241 

for a total 6.763 deg 




No Lo O-mode. 




There is no overlap with orbit 352 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: "Timothy Perry" <Timothy.Perry at OrbitalATK.com> 
To: "David Heirtzler" <dfh at cisunix.unh.edu>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS" <IBEXOPS at gmail.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Michelle Reno" <mreno at swri.edu>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com> 
Sent: Monday, December 26, 2016 11:36:44 AM 
Subject: IBEX Orbit # 353 ATS for Approval (9 - 18 Jan 2017) 



All, 

Attached are the planning files and ATS for Orbit# 353. 

Please respond to this email thread with comments and approvals. 

Approvals are required before COB 28 Dec 16. 



Please Note the following: 

1. APL Apogee contact 

IBEX,APL-18,ADD,01/13/17,013,18:00:00,01/13/17,013,18:35:00 



2. Apogee Sun Maneuver: 

2017-01-11T19:57:49.052Z,StarTrackerOutageStart 

2017-01-15T23:03:25.544Z,StarTrackerOutageStop 



3. Battery Balancing 

# Orbit# 353 PERIGEE: Battery Balancing Commands 

# 2017-01-18T12:11:34.693Z,Perigee,orbit:353 

@ECT_SetLongEclipseFlag TRUE $TIME=2017/01:18:11:00:00 

@ECT_SetLongEclipseFlag FALSE $TIME=2017/01:18:12:30:00 



4. 

# Input files: 1 

# IBEX_2017_009_o0353a_v001.scr 



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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 



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

SOFT CONSTRAINT VIOLATIONS 

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

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

transition to science mode at 2017/01/09 10:47:12 UTC 

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

transition to science mode at 2017/01/13 19:31:37 UTC 



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

OTHER MESSAGES 

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

NO MESSAGES. 













Timothy E. Perry 

CRS, IBEX & OCO-2 

Mission Operations 

Tim.perry at orbitalatk.com 

Office (703) 406-5976 

Cell (301) 606-1430 

Corp Cell (571) 447-8977 










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********************* 

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