[Isocops] IBEX ORbit# 375 ATS Approval (27 Jul 17 - 5 Aug 17) - v001/v002 approval
Ken Fairchild
fair-play at comcast.net
Tue Jul 18 02:10:49 EDT 2017
All,
I have looked at the orbit 375 ATS files,
IBEX_2017_208_o0375a_pre_eclipse_v001.scr
and
IBEX_2017_208_o0375a_post_eclipse_v002.scr,
and I approve.
The only constraint violations in
IBEX_2017_208_o0375a_v001.ccvr
are due to proximity/length of contacts, the eclipse and from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v001/v002 ATS files match those in the v003 STF,
IBEX_2017_208_o0375a_v003.stf.
Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time, the eclipse and 15 Re descending as determined form the OEF,
IBEX_2017_208_o0375a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about an hour before perigee and runs for about 11 1/2 hours. No despinning should be required due to this outage.
There is one moon in Lo FOV session but it occurs while the payload is off due to the eclipse.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit375_Contacts.txt,
for all contacts (6). There will also be several post-eclipse contacts with blind acqs.
No battery cell balancing because of the eclipse.
The inertial maneuver at perigee of orbit 374 left us pointing in safe directions for the orbit 375 arc A ascending and descending sequences:
ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:27:21:12:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.530544,+0.781435,+0.328455
which is R.A. +124.174 Decl. +19.175
missing R.A. +127.087 Decl. +19.055 (ibex-sun)
error is R.A. +2.913 Decl. +0.120
for a total 2.755 deg
ibex_rotate -o -u -0.530544,0.781435,0.328455 -w ibex-sun -t 2017/07:31:11:10:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.530544,+0.781435,+0.328455
which is R.A. +124.174 Decl. +19.175
missing R.A. +130.579 Decl. +18.197 (ibex-sun)
error is R.A. +6.405 Decl. +0.978
for a total 6.145 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 -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:12:53:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.592252,+0.743311,+0.311008
which is R.A. +128.547 Decl. +18.120
missing R.A. +130.650 Decl. +18.180 (ibex-sun)
error is R.A. +2.103 Decl. +0.060
for a total 1.999 deg
ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/07:31:14:28:46
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.592252,+0.743311,+0.311008
which is R.A. +128.547 Decl. +18.120
missing R.A. +130.715 Decl. +18.164 (ibex-sun)
error is R.A. +2.168 Decl. +0.044
for a total 2.061 deg
ibex_rotate -o -u -0.592252,0.743311,0.311008 -w ibex-sun -t 2017/08:05:00:17:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.592252,+0.743311,+0.311008
which is R.A. +128.547 Decl. +18.120
missing R.A. +135.053 Decl. +17.051 (ibex-sun)
error is R.A. +6.506 Decl. +1.069
for a total 6.293 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 376 apogee:
ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:02:31:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.652599,+0.698897,+0.292672
which is R.A. +133.038 Decl. +17.018
missing R.A. +135.141 Decl. +17.025 (ibex-sun)
error is R.A. +2.103 Decl. +0.007
for a total 2.011 deg
ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017-08-10T01:14:57.970Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.652599,+0.698897,+0.292672
which is R.A. +133.038 Decl. +17.018
missing R.A. +139.779 Decl. +15.618 (ibex-sun)
error is R.A. +6.741 Decl. +1.400
for a total 6.618 deg
No Lo O-mode.
There is no overlap with orbit 374 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: "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" <fair-play at comcast.net>, "Ken Fairchild" <kwfairchild at gmail.com>, "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: Thursday, July 13, 2017 5:00:28 PM
Subject: IBEX ORbit# 375 ATS Approval (27 Jul 17 - 5 Aug 17)
Guys,
Here are the planning files and ATS for Orbit# 375.
I have broken the ATS into two parts .
V001 ATS is Pre-Eclipse and V002 is Post-Eclipse
Please respond to this email thread with comments, questions and approvals
Approvals are required before 17 July 17 @ 1800 UTC.
Note the following:
1. Long Eclipse
2017-08-02T08:57:09.510Z,EclipseEntry,moderate:false,long:true,orbit:375
2017-08-02T13:54:40.702Z,EclipseExit,moderate:false,long:true,orbit:375
2. Command Load Constraint Violation Report (CCVR)
IBEX_2017_208_o0375a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-006: Planned transmission at 2017/08/01 11:58:00 UTC - 2017/08/01
13:32:00 UTC exceeds the maximum contiguous transmission time of
5400 seconds
IBX-CLC-006: Planned transmission at 2017/08/02 05:28:00 UTC - 2017/08/02
06:07:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 6180.000 seconds)
IBX-CLC-006: Planned transmission at 2017/08/02 07:28:00 UTC - 2017/08/02
08:32:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 6180.000 seconds)
IBX-CLC-006: Planned transmission at 2017/08/05 03:28:00 UTC - 2017/08/05
05:02:00 UTC exceeds the maximum contiguous transmission time of
5400 seconds
IBX-CLC-015: Battery charge falls below minimum from 2017/08/02 11:49:09 UTC -
2017/08/02 14:12:40 UTC. Lowest charge level is 0.000000
watt-minutes during this interval.
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2017/07/27 19:40:25 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2017/07/31 13:58:46 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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