[Isocops] IBEX ORbit# 394 ATS Approval (17 Jan 18 - 26 Jan 18) - v001 approval
Ken Fairchild
fair-play at comcast.net
Sun Jan 7 16:07:18 EST 2018
All,
Note: Angle at orbit 394 arc B descending after the apogee sun precession maneuver: 3.973 deg
I have looked at the orbit 394 ATS,
IBEX_2018_017_o0394a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_017_o0394a_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_017_o0394a_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_017_o0394a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts about 1 1/2 days before apogee and runs 4+ days. Some despinning may be required due to this outage.
There are two moon in Lo FOV sessions in the OEF but only one in the ATS ( the second session starts during the apogee maneuver and ends about two hours after the apogee ascending sequence). The first session is in arc A. The ATS start time is about 8 hours after that in the OEF and the ATS end time is about 5 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_Orbit394_Contacts.txt,
for all contacts (3).
There is an eclipse near perigee. The LE flag commands are correct, agree with Ryan's timing recommendations and are offset by enough time from other commands.
The inertial maneuver at perigee of orbit 393 left us pointing in safe directions for the orbit 394 arc A ascending and descending sequences:
ibex_rotate -o -u 0.398892,-0.837498,-0.373474 -w ibex-sun -t 2018/01:17:14:49:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.398892,-0.837498,-0.373474
which is R.A. +295.468 Decl. -21.930
missing R.A. +299.289 Decl. -20.736 (ibex-sun)
error is R.A. +3.821 Decl. +1.194
for a total 3.754 deg
ibex_rotate -o -u 0.398892,-0.837498,-0.373474 -w ibex-sun -t 2018/01:21:11:49:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.398892,-0.837498,-0.373474
which is R.A. +295.468 Decl. -21.930
missing R.A. +303.393 Decl. -19.915 (ibex-sun)
error is R.A. +7.925 Decl. +2.015
for a total 7.670 deg
The sun 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 -r +303.470 -d -19.897 -w ibex-sun -t 2018/01:21:13:37:58
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518579,-0.784379,-0.340330
which is R.A. +303.470 Decl. -19.897
missing R.A. +303.470 Decl. -19.897 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +303.470 -d -19.897 -w ibex-sun -t 2018/01:21:15:08:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518579,-0.784379,-0.340330
which is R.A. +303.470 Decl. -19.897
missing R.A. +303.535 Decl. -19.883 (ibex-sun)
error is R.A. +0.065 Decl. +0.014
for a total 0.063 deg
ibex_rotate -o -r +303.470 -d -19.897 -w ibex-sun -t 2018/01:25:12:29:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.518579,-0.784379,-0.340330
which is R.A. +303.470 Decl. -19.897
missing R.A. +307.559 Decl. -18.940 (ibex-sun)
error is R.A. +4.089 Decl. +0.957
for a total 3.973 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 395 apogee:
ibex_rotate -o -u 0.538574,-0.769221,-0.343856 -w ibex-sun -t 2018/01:25:14:37:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.538574,-0.769221,-0.343856
which is R.A. +304.998 Decl. -20.112
missing R.A. +307.654 Decl. -18.919 (ibex-sun)
error is R.A. +2.656 Decl. +1.193
for a total 2.773 deg
ibex_rotate -o -u 0.538574,-0.769221,-0.343856 -w ibex-sun -t 2018-01-30T13:13:13.228Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.538574,-0.769221,-0.343856
which is R.A. +304.998 Decl. -20.112
missing R.A. +312.838 Decl. -17.650 (ibex-sun)
error is R.A. +7.840 Decl. +2.462
for a total 7.815 deg
No Lo O-mode.
There is no overlap with orbit 393 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>, "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: Thursday, January 4, 2018 8:22:29 AM
Subject: IBEX ORbit# 394 ATS Approval (17 Jan 18 - 26 Jan 18)
Guys,
Here are the planning files and ATS for Orbit# 394
Please respond to this email thread with your comments and approvals
Approvals are required before 7 Jan 18 @1000 UTC
Note the following:
1. Moderate Eclipse
# 2018-01-26T01:27:13.624Z,PenumbraEntry,orbit:394
# 2018-01-26T01:27:13.624Z,EclipseEntry,moderate:true,long:false,orbit:394
# 2018-01-26T02:29:52.913Z,PenumbraExit,orbit:394
# 2018-01-26T02:29:52.913Z,EclipseExit,moderate:true,long:false,orbit:394
SetLongEclipseFlag TRUE $TIME=2018/01:25:23:35:00
SetLongEclipseFlag FALSE $TIME=2018/01:26:02:35:00
2. Moon in Lo FOV Commands
3. Command Load Constraint Violation Report
IBEX_2018_017_o0394a_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 2018/01/17 13:24:48 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/01/21 14:38:04 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
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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