[Isocops] IBEX ORbit# 413 ATS Approval (8 Jul 18 - 17 Jul 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Jun 27 18:00:35 EDT 2018
All,
I have looked at the orbit 413 ATS,
IBEX_2018_189_o0413a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_189_o0413a_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_189_o0413a_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_189_o0413a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 3 hours before perigee and runs for about 8 hours. No despinning should 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_Orbit413_Contacts.txt,
for all contacts (4).
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 412 left us pointing in safe directions for the orbit 413 arc A ascending and descending sequences:
ibex_rotate -o -u -0.238011,0.894762,0.377825 -w ibex-sun -t 2018/07:08:22:33:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.238011,+0.894762,+0.377825
which is R.A. +104.896 Decl. +22.199
missing R.A. +107.809 Decl. +22.405 (ibex-sun)
error is R.A. +2.913 Decl. +0.206
for a total 2.703 deg
ibex_rotate -o -u -0.238011,0.894762,0.377825 -w ibex-sun -t 2018/07:12:16:55:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.238011,+0.894762,+0.377825
which is R.A. +104.896 Decl. +22.199
missing R.A. +111.673 Decl. +21.925 (ibex-sun)
error is R.A. +6.777 Decl. +0.274
for a total 6.286 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 -0.312009,0.875739,0.368417 -w ibex-sun -t 2018/07:12:18:38:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.312009,+0.875739,+0.368417
which is R.A. +109.610 Decl. +21.618
missing R.A. +111.747 Decl. +21.916 (ibex-sun)
error is R.A. +2.137 Decl. +0.298
for a total 2.007 deg
ibex_rotate -o -u -0.312009,0.875739,0.368417 -w ibex-sun -t 2018/07:12:20:14:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.312009,+0.875739,+0.368417
which is R.A. +109.610 Decl. +21.618
missing R.A. +111.816 Decl. +21.907 (ibex-sun)
error is R.A. +2.206 Decl. +0.289
for a total 2.069 deg
ibex_rotate -o -u -0.312009,0.875739,0.368417 -w ibex-sun -t 2018/07:17:10:30:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.312009,+0.875739,+0.368417
which is R.A. +109.610 Decl. +21.618
missing R.A. +116.513 Decl. +21.226 (ibex-sun)
error is R.A. +6.903 Decl. +0.392
for a total 6.438 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 414 apogee:
ibex_rotate -o -u -0.386846,0.849681,0.358319 -w ibex-sun -t 2018/07:17:13:04:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.386846,+0.849681,+0.358319
which is R.A. +114.479 Decl. +20.997
missing R.A. +116.616 Decl. +21.206 (ibex-sun)
error is R.A. +2.137 Decl. +0.209
for a total 2.004 deg
ibex_rotate -o -u -0.386846,0.849681,0.358319 -w ibex-sun -t 2018-07-22T12:36:20.669Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.386846,+0.849681,+0.358319
which is R.A. +114.479 Decl. +20.997
missing R.A. +121.550 Decl. +20.266 (ibex-sun)
error is R.A. +7.071 Decl. +0.731
for a total 6.658 deg
No Lo O-mode.
There is no overlap with orbit 412 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On June 25, 2018 at 4:30 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 413
>
> Please respond to this email with your comments and approvals
>
> Approvals are required before 27 Jun 18 @1800 UTC
>
>
>
> Note the following:
>
> 1. No battery balancing
>
> 2. 30 Minute Perigee Tracking Contact
>
> IBEX,AUWA01,ADD,07/18/18,199,03:30:00,07/18/18,199,04:00:00,,LAHO 2K IBEX-2 Orbit# 413 Perigee Tracking Contact
>
> 3. Command Load Constraint Violation Report
>
> IBEX_2018_189_o0413a_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 2018/07/08 20:46:17 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/07/12 19:44:05 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
> Sheral R. Wesley
>
> Sr Systems Engineer
>
> IBEX , OCO2 Mission OPS
>
> CRS/CYGNUS Mission Planning
>
> Northrop Grumman Innovation Systems
>
> Bldg. 2 Room 1337
>
> Office (703) 406-5641
>
> Cell (202) 236-0802
>
>
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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