[Isocops] IBEX Orbit #440 ATS Approval ( 10 - 20 Mar ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Fri Mar 1 23:30:54 EST 2019
All,
Note: Angle at orbit 441 apogee after the perigee sun precession maneuver: 4.936 deg
I have looked at the orbit 440 ATS,
IBEX_2019_069_o0440a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2019_069_o0440a_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_2019_069_o0440a_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_2019_069_o0440a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 13+ hours before 15 Re descending and runs for 1+ days. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit440_Contacts.txt,
for all contacts (2).
We are not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial precession maneuver at perigee of orbit 439 left us pointing in safe directions for the orbit 440 arc A ascending and descending sequences:
ibex_rotate -o -u 0.986167,-0.147736,-0.075153 -w ibex-sun -t 2019/03:10:21:13:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.986167,-0.147736,-0.075153
which is R.A. +351.480 Decl. -4.310
missing R.A. +350.579 Decl. -4.081 (ibex-sun)
error is R.A. +0.901 Decl. +0.229
for a total 0.927 deg
ibex_rotate -o -u 0.986167,-0.147736,-0.075153 -w ibex-sun -t 2019/03:14:16:15:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.986167,-0.147736,-0.075153
which is R.A. +351.480 Decl. -4.310
missing R.A. +354.162 Decl. -2.532 (ibex-sun)
error is R.A. +2.682 Decl. +1.778
for a total 3.214 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 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:14:17:58:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993566,-0.099644,-0.053835
which is R.A. +354.273 Decl. -3.086
missing R.A. +354.227 Decl. -2.503 (ibex-sun)
error is R.A. +0.046 Decl. +0.583
for a total 0.585 deg
ibex_rotate -o -u 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:14:19:33:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993566,-0.099644,-0.053835
which is R.A. +354.273 Decl. -3.086
missing R.A. +354.287 Decl. -2.476 (ibex-sun)
error is R.A. +0.014 Decl. +0.610
for a total 0.610 deg
ibex_rotate -o -u 0.993566,-0.099644,-0.053835 -w ibex-sun -t 2019/03:19:10:33:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.993566,-0.099644,-0.053835
which is R.A. +354.273 Decl. -3.086
missing R.A. +358.382 Decl. -0.680 (ibex-sun)
error is R.A. +4.109 Decl. +2.406
for a total 4.760 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 441 apogee:
ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019/03:19:13:55:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999601,-0.026001,-0.011030
which is R.A. +358.510 Decl. -0.632
missing R.A. +358.510 Decl. -0.632 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +358.510 -d -0.632 -w ibex-sun -t 2019-03-24T09:54:34.035Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999601,-0.026001,-0.011030
which is R.A. +358.510 Decl. -0.632
missing R.A. +3.044 Decl. +1.320 (ibex-sun)
error is R.A. +355.466 Decl. +1.952
for a total 4.936 deg
No Lo O-mode.
There is no overlap with orbit 439 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On February 26, 2019 at 2:54 PM "Perry, Timothy" <Timothy.Perry at ngc.com> wrote:
>
>
> This time with the files…
>
>
>
> From: Perry, Timothy
> Sent: Tuesday, February 26, 2019 2:53 PM
> To: Chubin, Eric <Eric.Chubin at ngc.com>; Colin Joyce <colin.joyce at unh.edu>; David Heirtzler <David.Heirtzler at unh.edu>; Dreyer, Sean <Sean.Dreyer at ngc.com>; IBEX-FDG <IBEX.fdg at applieddefense.com>; IBEXOPS <IBEXOPS at gmail.com>; 'ISOC' <isocops at lists.sr.unh.edu>; Ken Fairchild <fair-play at comcast.net>; Ken Fairchild (kwfairchild at gmail.com) <kwfairchild at gmail.com>; Nigel Angold <nigel.angold at nasa.gov>; Paul Janzen <paul.janzen at umontana.edu>; Perry, Timothy <Timothy.Perry at ngc.com>; Tyler, Ryan <Ryan.Tyler at ngc.com>; Wesley, Sheral <Sheral.Wesley at ngc.com>
> Subject: IBEX Orbit #440 ATS Approval ( 10 - 20 Mar )
>
>
>
> All,
>
> Attached are the planning files for Orbit #440.
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by 20:00 gmt 28 Feb 2019.
>
>
>
> Please note the following:
>
> 1. No Battery Balancing this orbit.
>
> 2. The SSR dump pass will be uplinked on the orbit #441 ATS. The contact is at 14.5re ascending. (USHI01 03/20/19 079 04:00:00 - 05:00:00 160K)
>
> 3. IBEX_2019_069_o0440a_v001_.ccvr
>
> # Input files: 1
>
> # IBEX_2019_069_o0440a_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 2019/03/10 18:39:25 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2019/03/14 19:03:54 UTC
>
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
>
>
>
> Timothy E. Perry
>
> Mission Operations
>
> CRS, IBEX, OCO-2 & TESS
>
> RAPTOR Test Team
>
> timothy.perry at ngc.com mailto:timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
>
>
>
>
> ---------------------------------------------
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> *********************
>
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