[Isocops] IBEX Orbit# 404 ATS v002 Approval (16 Apr 18 - 25 Apr 18) - v002 approval
Ken Fairchild
fair-play at comcast.net
Fri Apr 6 10:52:42 EDT 2018
All,
I have looked at the orbit 404 ATS,
IBEX_2018_106_o0404a_v002.scr,
and I approve.
The only constraint violations in
IBEX_2018_106_o0404a_v002_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v002 ATS match those in the v002 STF,
IBEX_2018_106_o0404a_v002.stf,
except the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass.
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_106_o0404a_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
There is one moon in Lo FOV session in arc B. The ATS start time is 2- hours after that in the OEF and the ATS end time is about 4 hours before that in the OEF. These differences are not unusual.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit404_Contacts.txt,
or Sheral's email for all contacts (3).
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 403 left us pointing in safe directions for the orbit 404 arc A ascending and descending sequences:
ibex_rotate -o -u 0.912906,0.378101,0.153762 -w ibex-sun -t 2018/04:17:02:45:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.912906,+0.378101,+0.153762
which is R.A. +22.498 Decl. +8.845
missing R.A. +24.857 Decl. +10.306 (ibex-sun)
error is R.A. +2.359 Decl. +1.461
for a total 2.747 deg
ibex_rotate -o -u 0.912906,0.378101,0.153762 -w ibex-sun -t 2018/04:20:18:25:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.912906,+0.378101,+0.153762
which is R.A. +22.498 Decl. +8.845
missing R.A. +28.375 Decl. +11.619 (ibex-sun)
error is R.A. +5.877 Decl. +2.774
for a total 6.414 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 0.878294,0.442677,0.180656 -w ibex-sun -t 2018/04:20:20:08:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.878294,+0.442677,+0.180656
which is R.A. +26.749 Decl. +10.408
missing R.A. +28.443 Decl. +11.644 (ibex-sun)
error is R.A. +1.694 Decl. +1.237
for a total 2.072 deg
ibex_rotate -o -u 0.878294,0.442677,0.180656 -w ibex-sun -t 2018/04:20:21:43:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.878294,+0.442677,+0.180656
which is R.A. +26.749 Decl. +10.408
missing R.A. +28.505 Decl. +11.668 (ibex-sun)
error is R.A. +1.756 Decl. +1.260
for a total 2.135 deg
ibex_rotate -o -u 0.878294,0.442677,0.180656 -w ibex-sun -t 2018/04:25:08:47:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.878294,+0.442677,+0.180656
which is R.A. +26.749 Decl. +10.408
missing R.A. +32.570 Decl. +13.161 (ibex-sun)
error is R.A. +5.821 Decl. +2.753
for a total 6.327 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 405 apogee:
ibex_rotate -o -u 0.83794,0.504361,0.208509 -w ibex-sun -t 2018/04:25:11:19:04
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. +32.663 Decl. +13.190 (ibex-sun)
error is R.A. +1.619 Decl. +1.155
for a total 1.957 deg
ibex_rotate -o -u 0.83794,0.504361,0.208509 -w ibex-sun -t 2018-04-30T08:26:13.791Z
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. +37.406 Decl. +14.739 (ibex-sun)
error is R.A. +6.362 Decl. +2.704
for a total 6.753 deg
No Lo O-mode.
There is no overlap with orbit 403 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On April 4, 2018 at 11:09 AM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
>
>
> Guys,
>
> I have adjusted the APL-18 contact
>
> IBEX,APL-18,ADD,04/25/18,115,19:25:00,04/25/18,115,20:25:00,,11re-Descending Perigee 2K-320K IBEX Orbit# 404 SSR_Dump/Tracking Contact
>
>
>
> 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]
>
>
>
> From: Wesley, Sheral
> Sent: Tuesday, April 03, 2018 11:49 PM
> To: Chubin, Eric <Eric.Chubin at OrbitalATK.com>; Colin Joyce <cjl46 at wildcats.unh.edu>; David Heirtzler <dheirtzl at atlas.sr.unh.edu>; IBEX-FDG <IBEX.fdg at applieddefense.com>; IBEXOPS <IBEXOPS at gmail.com>; ISOC <isocops at lists.sr.unh.edu>; Ken Fairchild <kwfairchild at gmail.com>; 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, Timothy <Timothy.Perry at OrbitalATK.com>; Tyler, Ryan <Ryan.Tyler at OrbitalATK.com>; Wesley, Sheral <Sheral.Wesley at OrbitalATK.com>
> Subject: IBEX Orbit# 404 ATS Approval (16 Apr 18 - 25 Apr 18)
>
>
>
> Guys,
>
> Here are the planning files and ATS for Orbit# 404
>
> Please respond to this email thread with your comments and approvals.
>
> Approvals are required before 6 Apr 18 @1800 UTC
>
>
>
> Note the following:
>
> 1. APL-18 SSR_Dump/Tracking Contact
>
> IBEX,APL-18,ADD,04/25/18,115,19:15:00,04/25/18,115,20:15:00,,11re-Descending Perigee 2K-320K IBEX Orbit# 404 SSR_Dump/Tracking Contact
>
>
>
> 2. Moon in Lo FOV Commands
>
> 2018-04-21T19:18:41.991Z,MoonInLoFovStart,orbit:404
>
> 2018-04-23T01:24:17.387Z,MoonInLoFovStop,orbit:404
>
>
>
> 3. Command Load Constraint Violation Report
>
> IBEX_2018_106_o0404a_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 2018/04/17 00:54:16 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2018/04/20 21:13:38 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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