[Isocops] IBEX Orbit# 261 ATS (24 Sept 14 - 3 Oct 14) - v001 approval
Ken Fairchild
fair-play at comcast.net
Sun Sep 14 22:23:42 EDT 2014
All,
I have looked at the orbit 261 ATS,
IBEX_2014_267_o0261a_v001.scr,
and I approve.
The constraint violations in
IBEX_2014_267_o0261a_v001.ccvr
are all related to the early descent in arc B and the eclipse itself.
The PL commands in the v001 ATS match those in the v003 STF,
IBEX_2014_267_o0261a_v003.stf.
Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and the required early descent as determined from the OEF,
IBEX_2014_267_o0261a_v001.oef,
and as verified with ibex_orbit. The early descending sequence in arc B completes 2 hours before the LE flag is set.
There is one star tracker outage. It starts 2+ hours after perigee and ends about 8 hours later. No despinning should be required due to this outage.
The moon in Lo FOV session in arc B occurs after the early descent so the commands related to it do not appear in the ATS.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit261Contacts.txt,
for all contacts (4).
The LE eclipse flag is set because of the eclipse and the start and end times match Ryan's recommendations.
The inertial maneuver at perigee of orbit 260 left us pointing in safe directions for the orbit 261 arc A ascending and descending sequences:
ibex_rotate -o -u -0.999856,0.016562,-0.003578 -w ibex-sun -t 2014/09:25:10:20:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999856,+0.016562,-0.003578
which is R.A. +179.051 Decl. -0.205
missing R.A. +181.881 Decl. -0.824 (ibex-sun)
error is R.A. +2.830 Decl. +0.619
for a total 2.897 deg
ibex_rotate -o -u -0.999856,0.016562,-0.003578 -w ibex-sun -t 2014/09:28:20:46:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.999856,+0.016562,-0.003578
which is R.A. +179.051 Decl. -0.205
missing R.A. +184.907 Decl. -2.160 (ibex-sun)
error is R.A. +5.856 Decl. +1.955
for a total 6.172 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 -0.998098,-0.051767,-0.033487 -w ibex-sun -t 2014/09:28:22:29:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.998098,-0.051767,-0.033487
which is R.A. +182.969 Decl. -1.919
missing R.A. +184.972 Decl. -2.188 (ibex-sun)
error is R.A. +2.003 Decl. +0.269
for a total 2.020 deg
ibex_rotate -o -u -0.998098,-0.051767,-0.033487 -w ibex-sun -t 2014/09:29:00:04:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.998098,-0.051767,-0.033487
which is R.A. +182.969 Decl. -1.919
missing R.A. +185.032 Decl. -2.214 (ibex-sun)
error is R.A. +2.063 Decl. +0.295
for a total 2.083 deg
ibex_rotate -o -u -0.998098,-0.051767,-0.033487 -w ibex-sun -t 2014/10:02:08:20:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.998098,-0.051767,-0.033487
which is R.A. +182.969 Decl. -1.919
missing R.A. +188.138 Decl. -3.514 (ibex-sun)
error is R.A. +5.169 Decl. +1.595
for a total 5.403 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 262 apogee:
ibex_rotate -o -u -0.990504,-0.121882,-0.063609 -w ibex-sun -t 2014/10:03:09:02:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.990504,-0.121882,-0.063609
which is R.A. +187.015 Decl. -3.647
missing R.A. +189.107 Decl. -3.915 (ibex-sun)
error is R.A. +2.092 Decl. +0.268
for a total 2.105 deg
ibex_rotate -o -u -0.990504,-0.121882,-0.063609 -w ibex-sun -t 2014-10-08T05:04:25.240Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.990504,-0.121882,-0.063609
which is R.A. +187.015 Decl. -3.647
missing R.A. +193.384 Decl. -5.765 (ibex-sun)
error is R.A. +6.369 Decl. +2.118
for a total 6.691 deg
No Lo O-mode.
There is no overlap with orbit 260 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: "Ibex Mission Operations" <ibexops at gmail.com>
To: "FDG, IBEX" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "OPS, ISOC" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Fairchild, Ken" <fair-play at comcast.net>, "Quinn, Marty" <marty.quinn at unh.edu>, "Angold, Nigel" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Tyler, Ryan" <tyler.ryan at orbital.com>, "Wesley, Sheral" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Perry, Tim" <perry.tim at orbital.com>
Sent: Friday, September 12, 2014 1:13:43 PM
Subject: IBEX Orbit# 261 ATS (24 Sept 14 - 3 Oct 14)
Guys,
Here are the planning files and ATS for Orbit# 261.
Reply to this email thread with comments/questions and approvals.
Approvals are required before 15 Sept 14 @1000 UTC
Please note the following
1. Long Eclipse 198.8 minutes long
# Orbit# 261 Long Eclipse ENTRY: BUS Commands
# 2014-10-02T12:53:50.934Z,PenumbraEntry,orbit:261
# 2014-10-02T12:53:50.934Z,EclipseEntry,moderate:false,long:true,orbit:261
ECT_SetLongEclipseFlag TRUE $TIME=2014/10:02:10:20:00
# Orbit# 261 Long Eclipse EXIT: BUS Command
# 2014-10-02T16:12:08.406Z,PenumbraExit,orbit:261
# 2014-10-02T16:12:08.406Z,EclipseExit,moderate:false,long:true,orbit:261
ECT_SetLongEclipseFlag FALSE $TIME=2014/10:02:21:20:08
2. Early PAYLOAD descent because of eclipse and will remain in HVSTANDBY for the remainder of arc-b
3. Command Load Constraint Violation Report (CCVR)
IBEX_2014_267_o0261a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-003: Payload mode is HVSCI during interval 2014/10/03 08:52:20 UTC -
2014/10/03 09:02:20 UTC, which overlaps 5N thruster maneuver at
2014/10/03 08:52:20 UTC - 2014/10/03 09:02:20 UTC
* MPS thinks that the PAYLOAD ramped backed up after the eclipse. We will remain in HVSTANDBY after the eclipse and will go back to nominal ops at 15_re Ascending in Orbit# 262
IBX-CLC-009: Payload mode is HVSCI during interval 2014/10/03 15:03:42 UTC -
2014/10/03 22:43:31 UTC, which overlaps times when IBEX is under 10
RE at 2014/10/03 15:03:42 UTC - 2014/10/03 22:43:31 UTC
* MPS thinks that the PAYLOAD ramped backed up after the eclipse. We will remain in HVSTANDBY after the eclipse and will go back to nominal ops at 15_re Ascending in Orbit# 262
IBX-CLC-015: Battery charge falls below minimum from 2014/10/02 15:07:50 UTC -
2014/10/02 16:30:08 UTC. Lowest charge level is 0.000000
watt-minutes during this interval.
* We will set the long eclipse flag approx. 2.5 hours prior to the start of the eclipse and approx. 5 hours after the eclipse.
Predicted minium cell volatge is 3.35V
ECT_SetLongEclipseFlag TRUE $TIME=2014/10:02:10:20:00
ECT_SetLongEclipseFlag FALSE $TIME=2014/10:02:21:20:08
IBX-CLC-017: Spacecraft mode is not Housekeeping during a maneuver at 2014/10/03
08:52:20 UTC - 2014/10/03 09:07:20 UTC
* We will be in housekeeping prior to the eclipse after the Descending Payload commands and remain there until 10_re Ascending in Orbit# 262
FCT_SetScState housekeeping $TIME=2014/10:02:09:19:01
==============
OTHER MESSAGES
==============
NO MESSAGES.
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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