[Isocops] IBEX Orbit# 405 ATS Approval (25 Apr 18 - 4 May 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Sun Apr 15 10:05:37 EDT 2018
All,
I have looked at the orbit 405 ATS,
IBEX_2018_115_o0405a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_115_o0405a_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_115_o0405a_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_115_o0405a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. It starts 1+ days after apogee and runs for 2- days. 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_Orbit405_Contacts.txt,
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 404 left us pointing in safe directions for the orbit 405 arc A ascending and descending sequences:
ibex_rotate -o -u 0.83794,0.504361,0.208509 -w ibex-sun -t 2018/04:26:07:27:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.837940,+0.504361,+0.208509
which is R.A. +31.044 Decl. +12.035
missing R.A. +33.456 Decl. +13.419 (ibex-sun)
error is R.A. +2.412 Decl. +1.384
for a total 2.729 deg
ibex_rotate -o -u 0.83794,0.504361,0.208509 -w ibex-sun -t 2018/04:29:20:52:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.837940,+0.504361,+0.208509
which is R.A. +31.044 Decl. +12.035
missing R.A. +36.945 Decl. +14.582 (ibex-sun)
error is R.A. +5.901 Decl. +2.547
for a total 6.281 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 0.794147,0.561601,0.23224 -w ibex-sun -t 2018/04:29:22:35:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.794147,+0.561601,+0.232240
which is R.A. +35.267 Decl. +13.429
missing R.A. +37.013 Decl. +14.605 (ibex-sun)
error is R.A. +1.746 Decl. +1.176
for a total 2.063 deg
ibex_rotate -o -u 0.794147,0.561601,0.23224 -w ibex-sun -t 2018/04:30:00:10:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.794147,+0.561601,+0.232240
which is R.A. +35.267 Decl. +13.429
missing R.A. +37.077 Decl. +14.627 (ibex-sun)
error is R.A. +1.810 Decl. +1.198
for a total 2.125 deg
ibex_rotate -o -u 0.794147,0.561601,0.23224 -w ibex-sun -t 2018/05:04:08:51:23
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.794147,+0.561601,+0.232240
which is R.A. +35.267 Decl. +13.429
missing R.A. +41.142 Decl. +15.944 (ibex-sun)
error is R.A. +5.875 Decl. +2.515
for a total 6.214 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 406 apogee:
ibex_rotate -o -u 0.745068,0.615608,0.256711 -w ibex-sun -t 2018/05:04:11:19:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.745068,+0.615608,+0.256711
which is R.A. +39.565 Decl. +14.875
missing R.A. +41.235 Decl. +15.969 (ibex-sun)
error is R.A. +1.669 Decl. +1.094
for a total 1.946 deg
ibex_rotate -o -u 0.745068,0.615608,0.256711 -w ibex-sun -t 2018-05-09T09:13:48.297Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.745068,+0.615608,+0.256711
which is R.A. +39.565 Decl. +14.875
missing R.A. +46.098 Decl. +17.331 (ibex-sun)
error is R.A. +6.533 Decl. +2.456
for a total 6.739 deg
No Lo O-mode.
There is no overlap with orbit 404 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On April 13, 2018 at 10:26 AM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 405
>
> Please respond to the email thread with your comments and approvals
>
> Approvals are required before 15 Apr 18 @1800 UTC
>
>
>
> Note the following
>
> 1. IBEX Hi Gain Test
>
> Orbit# 405 APOGEE: IBEX_Hi Gain Test (3 May 18 0300-0715 UTC)
>
>
>
> 2. Battery Balancing
>
> 2018-05-04T20:19:37.793Z,Perigee,orbit:405
>
> SetLongEclipseFlag TRUE $TIME=2018/05:04:19:00:00
>
> SetLongEclipseFlag FALSE $TIME=2018/05:04:20:30:00
>
>
>
> 3. Command Load Constraint Violation Report
>
> IBEX_2018_115_o0405a_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 2018/04/26 05:38:59 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/04/29 23:40:39 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
>
>
>
>
> Sheral R. Wesley
>
> Sr Systems Engineer
>
> IBEX, OCO2 Mission OPS
>
> CRS/CYGNUS Mission Planning
>
> Bldg. 2 Room 1337
>
> Office (703) 406-5641
>
> Cell (202) 236-0802
>
> [cid:image001.jpg at 01D04F6C.5A1C97F0]
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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