[Isocops] IBEX Orbit# 397 ATS Approval (13 Feb 18 - 21 Feb 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Fri Feb 2 16:32:15 EST 2018
All,
I have looked at the orbit 397 ATS,
IBEX_2018_044_o0397a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_044_o0397a_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_044_o0397a_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_044_o0397a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days after apogee and runs for 2+ days. Some despinning may be required due to this outage.
There is one moon in Lo FOV session in arc B. The ATS start time is about 13 hours before that in the OEF and the ATS end time is about 8 1/2 hours after 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_Orbit397_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 396 left us pointing in safe directions for the orbit 397 arc A ascending and descending sequences:
ibex_rotate -o -u 0.775715,-0.575173,-0.259696 -w ibex-sun -t 2018/02:13:12:03:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.775715,-0.575173,-0.259696
which is R.A. +323.444 Decl. -15.052
missing R.A. +326.813 Decl. -13.375 (ibex-sun)
error is R.A. +3.369 Decl. +1.677
for a total 3.671 deg
ibex_rotate -o -u 0.775715,-0.575173,-0.259696 -w ibex-sun -t 2018/02:16:22:33:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.775715,-0.575173,-0.259696
which is R.A. +323.444 Decl. -15.052
missing R.A. +330.209 Decl. -12.177 (ibex-sun)
error is R.A. +6.765 Decl. +2.875
for a total 7.175 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 0.8625,-0.460416,-0.210028 -w ibex-sun -t 2018/02:17:00:16:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.862500,-0.460416,-0.210028
which is R.A. +331.906 Decl. -12.124
missing R.A. +330.277 Decl. -12.151 (ibex-sun)
error is R.A. +1.629 Decl. +0.027
for a total 1.593 deg
ibex_rotate -o -u 0.8625,-0.460416,-0.210028 -w ibex-sun -t 2018/02:17:01:51:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.862500,-0.460416,-0.210028
which is R.A. +331.906 Decl. -12.124
missing R.A. +330.340 Decl. -12.128 (ibex-sun)
error is R.A. +1.566 Decl. +0.004
for a total 1.531 deg
ibex_rotate -o -u 0.8625,-0.460416,-0.210028 -w ibex-sun -t 2018/02:21:09:13:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.862500,-0.460416,-0.210028
which is R.A. +331.906 Decl. -12.124
missing R.A. +334.381 Decl. -10.590 (ibex-sun)
error is R.A. +2.475 Decl. +1.534
for a total 2.871 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 398 apogee:
ibex_rotate -o -u 0.899437,-0.396811,-0.183179 -w ibex-sun -t 2018/02:21:11:26:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.899437,-0.396811,-0.183179
which is R.A. +336.194 Decl. -10.555
missing R.A. +334.470 Decl. -10.559 (ibex-sun)
error is R.A. +1.724 Decl. +0.004
for a total 1.695 deg
ibex_rotate -o -u 0.899437,-0.396811,-0.183179 -w ibex-sun -t 2018-02-26T09:31:34.335Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.899437,-0.396811,-0.183179
which is R.A. +336.194 Decl. -10.555
missing R.A. +339.258 Decl. -8.743 (ibex-sun)
error is R.A. +3.064 Decl. +1.812
for a total 3.522 deg
No Lo O-mode.
There is no overlap with orbit 396 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
---------------------------------------------
From: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com>
To: "Eric Chubin" <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>, "Robert Lockwood" <Robert.Lockwood at OrbitalATK.com>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Timothy Perry" <Timothy.Perry at OrbitalATK.com>, "Ryan Tyler" <Ryan.Tyler at OrbitalATK.com>, "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com>
Sent: Wednesday, January 31, 2018 9:43:42 AM
Subject: IBEX Orbit# 397 ATS Approval (13 Feb 18 - 21 Feb 18)
Guys,
Here are the planning files and ATS for Orbit# 397.
Please respond to this email thread with your comments and approvals
Approvals are required before 2 Feb 18 @1800 UTC
Note the following:
1. PERIGEE Battery Balancing
Orbit# 397 PERIGEE BAttery BAlancing
# 2018-02-21T21:06:02.867Z,Perigee,orbit:397
SetLongEclipseFlag TRUE $TIME=2018/02:21:20:00:00
SetLongEclipseFlag FALSE $TIME=2018/02:21:21:30:00
2. Moon in Lo FOV Commands
2018-02-19T13:57:10.625Z,MoonInLoFovStart,orbit:397
2018-02-20T11:08:11.447Z,MoonInLoFovStop,orbit:397
3. Command Load Constraint Violation Report
IBEX_2018_044_o0397a_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 2018/02/13 10:35:36 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/02/17 01:21:14 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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Thank you.
*********************
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