All,

I have looked at the orbit 427 ATS,

IBEX_2018_316_o0427a_v001.scr​,

and I approve.

The only constraint violations in

IBEX_2018_316_o0427a_v001_.ccvr

are 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_2018_316_o0427a_v002.stf.

Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,

IBEX_2018_316_o0427a_v001.oef,

and as verified with ibex_orbit.

 
There are no star tracker outages.​

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

IBEX_2018_316_o0427a_v001.oef

for all contacts (3).

 
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 426 left us pointing in safe directions for the orbit 427 arc A ascending and descending sequences:​

ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018/11:12:18:11:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.681259,-0.667931,-0.299590
 which is     R.A. +224.434 Decl. -17.433
 missing      R.A. +227.626 Decl. -17.783 (ibex-sun)
 error is     R.A.   +3.192 Decl.  +0.350
 for a total  3.062 deg
 
ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018/11:16:05:04:04
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.681259,-0.667931,-0.299590
 which is     R.A. +224.434 Decl. -17.433
 missing      R.A. +231.055 Decl. -18.647 (ibex-sun)
 error is     R.A.   +6.621 Decl.  +1.214
 for a total  6.411 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 -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:16:06:47:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.621573,-0.714585,-0.320960
 which is     R.A. +228.982 Decl. -18.721
 missing      R.A. +231.128 Decl. -18.664 (ibex-sun)
 error is     R.A.   +2.146 Decl.  +0.057
 for a total  2.033 deg
 
ibex_rotate -o -u -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:16:08:22:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.621573,-0.714585,-0.320960
 which is     R.A. +228.982 Decl. -18.721
 missing      R.A. +231.195 Decl. -18.679 (ibex-sun)
 error is     R.A.   +2.213 Decl.  +0.042
 for a total  2.097 deg

ibex_rotate -o -u -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:20:15:18:08
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.621573,-0.714585,-0.320960
 which is     R.A. +228.982 Decl. -18.721
 missing      R.A. +235.726 Decl. -19.683 (ibex-sun)
 error is     R.A.   +6.744 Decl.  +0.962
 for a total  6.441 deg​

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 428 apogee:
 
ibex_rotate -o -u -0.559607,-0.756679,-0.338048 -w ibex-sun -t 2018/11:20:17:45:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.559607,-0.756679,-0.338048
 which is     R.A. +233.515 Decl. -19.758
 missing      R.A. +235.840 Decl. -19.711 (ibex-sun)
 error is     R.A.   +2.325 Decl.  +0.047
 for a total  2.189 deg

ibex_rotate -o -u -0.559607,-0.756679,-0.338048 -w ibex-sun -t 2018-11-25T15:41:47
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.559607,-0.756679,-0.338048
 which is     R.A. +233.515 Decl. -19.758
 missing      R.A. +240.934 Decl. -20.759 (ibex-sun)
 error is     R.A.   +7.419 Decl.  +1.001
 for a total  7.031 deg

No Lo O-mode.

There is no overlap with orbit 426 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Colin


From: Isocops <isocops-bounces@lists.sr.unh.edu> on behalf of Perry, Timothy <Timothy.Perry@OrbitalATK.com>
Sent: Monday, October 29, 2018 5:19 PM
To: Chubin, Eric; Colin Joyce; David Heirtzler; IBEX-FDG; IBEXOPS; ISOC; Ken Fairchild; Ken Fairchild; Lockwood, Robert; Nigel Angold; Paul Janzen; Tyler, Ryan; Wesley, Sheral; Dreyer, Sean
Subject: [Isocops] IBEX Orbit #427 ATS Approval ( 12 - 21 Nov )
 

All,

   Attached are the planning files for Orbit #427.

Please respond to this thread with comments and approvals.

Approvals are required by COB 01 Nov 18.

 

Note the Following:

1.       #  Orbit# 427 PERIGEE Battery Balancing

#  2018-11-21T02:54:44.216Z,Perigee,orbit:427

  @ECT_SetLongEclipseFlag TRUE $TIME=2018/11:21:02:00:00

  @ECT_SetLongEclipseFlag FALSE $TIME=2018/11:21:03:30:00  

 

2.        IBEX_2018_316_o0427a_v001_.ccvr

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

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 2018/11/12 16:31:28 UTC

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

             transition to science mode at 2018/11/16 07:52:18 UTC

 

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

OTHER MESSAGES

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

NO MESSAGES.

 

Timothy E. Perry

CRS, IBEX, OCO-2 & TESS

Mission Operations

Tim.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

Corp Cell (571) 447-8977

 

cid:image002.png@01D43627.CCEBFFF0

 

 
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