[Isocops] IBEX Orbit 342 ATS for review (Sept 30 - Oct 9) - v002 approval

Tue Sep 20 20:41:57 EDT 2016

All, 

I have looked at the orbit 342 ATS, 

IBEX_2016_274_o0342a_v002.scr , 

and I approve. 

The only constraint violations in 

IBEX_2016_274_o0342a_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2016_274_o0342a_v002.stf , 

except that the ATS has an SSR_DUMP_NEW command as well as SSR pointer reset commands . 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_2016_274_o0342a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 5 hours after orbit 341 perigee and ends about an hour after 15 Re ascending. The second starts about 7 hours after perigee and runs for about 4 hours. No despinning should be required due to these outages. 

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_Orbit342_Contacts.txt, 

for all contacts (3). There is a 5 minute discrepancy between the end time of the APL contact in the contacts file and the ATS. I checked with Tim and evidently the contacts file is incorrect. 

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

The inertial maneuver at perigee of orbit 341 left us pointing in safe directions for the orbit 342 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.995985,-0.077826,-0.04423 -w ibex-sun -t 2016/09:30:23:51:39 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.995985,-0.077826,-0.044230 

which is R.A. +184.468 Decl. -2.535 

missing R.A. +187.348 Decl. -3.191 (ibex-sun) 

error is R.A. +2.880 Decl. +0.656 

for a total 2.951 deg 

ibex_rotate -o -u -0.995985,-0.077826,-0.04423 -w ibex-sun -t 2016/10:04:10:32:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.995985,-0.077826,-0.044230 

which is R.A. +184.468 Decl. -2.535 

missing R.A. +190.375 Decl. -4.498 (ibex-sun) 

error is R.A. +5.907 Decl. +1.963 

for a total 6.214 deg 

The inertial 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 -u -0.986406,-0.146381,-0.074665 -w ibex-sun -t 2016/10:04:12:12:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.986406,-0.146381,-0.074665 

which is R.A. +188.441 Decl. -4.282 

missing R.A. +190.438 Decl. -4.525 (ibex-sun) 

error is R.A. +1.997 Decl. +0.243 

for a total 2.006 deg 

ibex_rotate -o -u -0.986406,-0.146381,-0.074665 -w ibex-sun -t 2016/10:04:13:50:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.986406,-0.146381,-0.074665 

which is R.A. +188.441 Decl. -4.282 

missing R.A. +190.500 Decl. -4.550 (ibex-sun) 

error is R.A. +2.059 Decl. +0.268 

for a total 2.071 deg 

ibex_rotate -o -u -0.986406,-0.146381,-0.074665 -w ibex-sun -t 2016/10:08:20:15:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.986406,-0.146381,-0.074665 

which is R.A. +188.441 Decl. -4.282 

missing R.A. +194.521 Decl. -6.183 (ibex-sun) 

error is R.A. +6.080 Decl. +1.901 

for a total 6.346 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 343 apogee: 

ibex_rotate -o -u -0.971114,-0.214917,-0.103678 -w ibex-sun -t 2016/10:08:22:30:34 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.971114,-0.214917,-0.103678 

which is R.A. +192.479 Decl. -5.951 

missing R.A. +194.612 Decl. -6.221 (ibex-sun) 

error is R.A. +2.133 Decl. +0.270 

for a total 2.138 deg 

ibex_rotate -o -u -0.971114,-0.214917,-0.103678 -w ibex-sun -t 2016-10-13T18:15:13.814Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.971114,-0.214917,-0.103678 

which is R.A. +192.479 Decl. -5.951 

missing R.A. +198.925 Decl. -8.033 (ibex-sun) 

error is R.A. +6.446 Decl. +2.082 

for a total 6.728 deg 

No Lo O-mode. 

There is no overlap with orbit 341 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: "Perry.Tim" <tim.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>, "Lockwood.Robert" <robert.lockwood at orbitalatk.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Michelle Reno" <mreno at swri.edu>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Saturday, September 17, 2016 7:55:03 AM 
Subject: IBEX Orbit 342 ATS for review (Sept 30 - Oct 9) 

All, 

Attached are the planning products for Orbit #342 

Please respond to this email thread with your comments and approvals by COB Sept 19. 

Note the following: 

1. No Battery Balancing this orbit. 

2. # Input files: 1 

# IBEX_2016_274_o0342a_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 2016/09/30 22:19:26 UTC 

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

transition to science mode at 2016/10/04 13:20:30 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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Thank you. 
********************* 

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