[Isocops] IBEX ORbit# 379 ATS (2 Sept 17 - 11 Sept 17) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Aug 23 02:05:17 EDT 2017
All,
I have looked at the orbit 379 ATS,
IBEX_2017_245_o0379a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2017_245_o0379a_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_2017_245_o0379a_v002.stf.
Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,
IBEX_2017_245_o0379a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts about 10 hours after 15 Re ascending and runs for 1+ days. The second starts about 4 hours after perigee and runs for almost 6 hours. Some despinning may be required due to the first 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_Orbit379_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 378 left us pointing in safe directions for the orbit 379 arc A ascending and descending sequences:
ibex_rotate -o -u -0.922547,0.357684,0.144805 -w ibex-sun -t 2017/09:02:15:43:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.922547,+0.357684,+0.144805
which is R.A. +158.808 Decl. +8.326
missing R.A. +161.628 Decl. +7.760 (ibex-sun)
error is R.A. +2.820 Decl. +0.566
for a total 2.849 deg
ibex_rotate -o -u -0.922547,0.357684,0.144805 -w ibex-sun -t 2017/09:06:05:56:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.922547,+0.357684,+0.144805
which is R.A. +158.808 Decl. +8.326
missing R.A. +164.799 Decl. +6.458 (ibex-sun)
error is R.A. +5.991 Decl. +1.868
for a total 6.227 deg
The inertial 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 -0.949205,0.292648,0.115613 -w ibex-sun -t 2017/09:06:07:39:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949205,+0.292648,+0.115613
which is R.A. +162.865 Decl. +6.639
missing R.A. +164.864 Decl. +6.432 (ibex-sun)
error is R.A. +1.999 Decl. +0.207
for a total 1.997 deg
ibex_rotate -o -u -0.949205,0.292648,0.115613 -w ibex-sun -t 2017/09:06:09:14:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949205,+0.292648,+0.115613
which is R.A. +162.865 Decl. +6.639
missing R.A. +164.924 Decl. +6.408 (ibex-sun)
error is R.A. +2.059 Decl. +0.231
for a total 2.059 deg
ibex_rotate -o -u -0.949205,0.292648,0.115613 -w ibex-sun -t 2017/09:10:20:22:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.949205,+0.292648,+0.115613
which is R.A. +162.865 Decl. +6.639
missing R.A. +169.059 Decl. +4.728 (ibex-sun)
error is R.A. +6.194 Decl. +1.911
for a total 6.453 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 380 apogee:
ibex_rotate -o -u -0.970909,0.22326,0.086547 -w ibex-sun -t 2017/09:10:22:55:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.970909,+0.223260,+0.086547
which is R.A. +167.050 Decl. +4.965
missing R.A. +169.156 Decl. +4.684 (ibex-sun)
error is R.A. +2.106 Decl. +0.280
for a total 2.117 deg
ibex_rotate -o -u -0.970909,0.22326,0.086547 -w ibex-sun -t 2017-09-15T23:46:45.940Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.970909,+0.223260,+0.086547
which is R.A. +167.050 Decl. +4.965
missing R.A. +173.545 Decl. +2.769 (ibex-sun)
error is R.A. +6.495 Decl. +2.196
for a total 6.842 deg
No Lo O-mode.
There is no overlap with orbit 378 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi .
Command Approval Checklist is attached.
Ken
----- Original Message -----
From: "Sheral Wesley" <Sheral.Wesley at OrbitalATK.com>
To: "Eric Chubin" <Eric.Chubin at OrbitalATK.com>, "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: Saturday, August 19, 2017 2:41:58 PM
Subject: IBEX ORbit# 379 ATS (2 Sept 17 - 11 Sept 17)
Guys,
Here are the planning files and ATS for Orbit# 379.
Please respond to this email thread with your comments and approvals.
Approvals are required before 22 Aug @1800 UTC
Note the following:
1. Battery Balancing at Perigee
2017-09-11T07:40:57.323Z,Perigee,orbit:379
SetLongEclipseFlag TRUE $TIME=2017/09:11:07:00:00
SetLongEclipseFlag FALSE $TIME=2017/09:11:08:30:00
2. Command Load Constraint Violation Report
IBEX_2017_245_o0379a_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 2017/09/02 14:02:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2017/09/06 08:44:26 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Sheral R. Wesley
Sr Systems Engineer
IBEX Mission OPS
CRS/CYGNUS Mission Planning
Bldg. 2 Room 1337
Office (703) 406-5641
Cell (202) 236-0802
Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication.
Thank you.
*********************
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