[Isocops] IBEX Orbit# 376 ATS (5 Aug 17 - 14 Aug 17) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Jul 26 18:32:40 EDT 2017
All,
I have looked at the orbit 376 ATS,
IBEX_2017_217_o0376a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2017_217_o0376a_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_217_o0376a_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 and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,
IBEX_2017_217_o0376a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts about 10 hours after orbit 375 perigee and ends about 20 hours after 15 Re ascending. The second starts 20 minutes before perigee and runs for about 7 1/2 hours. Some despinning may be required due to the first outage.
There are two moon in Lo FOV sessions in arc B. The ATS start time of the first session is 2 hours after that in the OEF and the ATS end time is 8+ hours before that in the OEF. The ATS start time of the second session is about 6 hours after that in the OEF and the ATS and OEF end times are the same. Differences in timing are not unusual.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit376_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 375 left us pointing in safe directions for the orbit 376 arc A ascending and descending sequences:
ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:05:23:54:31
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. +135.928 Decl. +16.758 (ibex-sun)
error is R.A. +2.890 Decl. +0.260
for a total 2.778 deg
ibex_rotate -o -u -0.652599,0.698897,0.292672 -w ibex-sun -t 2017/08:09:13:41:49
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. +139.313 Decl. +15.754 (ibex-sun)
error is R.A. +6.275 Decl. +1.264
for a total 6.151 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 -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:15:24:57
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.707368,+0.652558,+0.271659
which is R.A. +137.308 Decl. +15.763
missing R.A. +139.383 Decl. +15.733 (ibex-sun)
error is R.A. +2.075 Decl. +0.030
for a total 1.997 deg
ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:09:17:00:03
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.707368,+0.652558,+0.271659
which is R.A. +137.308 Decl. +15.763
missing R.A. +139.446 Decl. +15.715 (ibex-sun)
error is R.A. +2.138 Decl. +0.048
for a total 2.059 deg
ibex_rotate -o -u -0.707368,0.652558,0.271659 -w ibex-sun -t 2017/08:14:03:51:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.707368,+0.652558,+0.271659
which is R.A. +137.308 Decl. +15.763
missing R.A. +143.741 Decl. +14.404 (ibex-sun)
error is R.A. +6.433 Decl. +1.359
for a total 6.358 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 377 apogee:
ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017/08:14:06:13:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.760203,+0.599769,+0.249738
which is R.A. +141.728 Decl. +14.462
missing R.A. +143.832 Decl. +14.372 (ibex-sun)
error is R.A. +2.104 Decl. +0.090
for a total 2.040 deg
ibex_rotate -o -u -0.760203,0.599769,0.249738 -w ibex-sun -t 2017-08-19T07:36:36.557Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.760203,+0.599769,+0.249738
which is R.A. +141.728 Decl. +14.462
missing R.A. +148.456 Decl. +12.757 (ibex-sun)
error is R.A. +6.728 Decl. +1.705
for a total 6.757 deg
No Lo O-mode.
There is no overlap with orbit 375 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: Sunday, July 23, 2017 12:15:18 PM
Subject: IBEX Orbit# 376 ATS (5 Aug 17 - 14 Aug 17)
Guys,
Here are the planning files and ATS for Orbit# 376.
Please respond to this email thread with your comments and approvals
Approvals are required before 27 July 17 @1800 UTC
The ATS will be upload after the spacecraft has recovered from the Orbit# 375 Long Eclipse
Note the following:
1. APL-18 SSR_Dump/Tracking Contact
IBEX,APL-18,ADD,08/14/17,226,08:30:00,08/14/17,226,09:30:00,,13re-Descending Perigee 2K-320K IBEX Orbit# 376 SSR_Dump/Tracking Contact(13 Desc)
2. Moon in Lo FOV Commands
2017-08-10T07:31:03.744Z,MoonInLoFovStart,orbit:376
2017-08-12T02:19:31.561Z,MoonInLoFovStop,orbit:376
2017-08-13T08:14:24.094Z,MoonInLoFovStart,orbit:376
2017-08-14T02:18:54.398Z,MoonInLoFovStop,orbit:376
3. Battery Balancing
Orbit# 376 PERIGEE: Battery Balancing Commands
# 2017-08-14T15:28:36.693Z,Perigee,orbit:376
SetLongEclipseFlag TRUE $TIME=2017/08:14:15:00:00
SetLongEclipseFlag FALSE $TIME=2017/08:14:16:30:00
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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