[Isocops] IBEX Orbit# 279 ATS (8 Mar 15 - 17 Mar 15) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Feb 25 11:12:13 EST 2015
All,
I have looked at the orbit 279 ATS,
IBEX_2015_067_o0279a_v001.scr,
and I approve.
The constraint violation in
IBEX_2015_067_o0279a_v001.ccvr
is related to the eclipse and isn't a problem.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2015_067_o0279a_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_2015_067_o0279a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts 1+ days after apogee and runs for 2+ days. Some despinning may be required due to this outage.
There is one moon in Lo FOV session in arc B. The ATS start time is almost two hours before that in the OEF and the ATS end time is 4 hours before 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_Orbit279Contacts.txt,
for all contacts (2).
The LE flag is set because of the eclipse. The command start and end times match Ryan's recommendations.
The inertial maneuver at perigee of orbit 278 left us pointing in safe directions for the orbit 279 arc A ascending and descending sequences:
ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015/03:09:02:29:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.977862,-0.209243,-0.001815
which is R.A. +347.922 Decl. -0.104
missing R.A. +348.978 Decl. -4.748 (ibex-sun)
error is R.A. +1.056 Decl. +4.644
for a total 4.762 deg
ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015/03:12:15:40:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.977862,-0.209243,-0.001815
which is R.A. +347.922 Decl. -0.104
missing R.A. +352.304 Decl. -3.360 (ibex-sun)
error is R.A. +4.382 Decl. +3.256
for a total 5.457 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 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:12:17:23:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988975,-0.145863,+0.025531
which is R.A. +351.610 Decl. +1.463
missing R.A. +352.369 Decl. -3.331 (ibex-sun)
error is R.A. +0.759 Decl. +4.794
for a total 4.854 deg
ibex_rotate -o -u 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:12:18:59:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988975,-0.145863,+0.025531
which is R.A. +351.610 Decl. +1.463
missing R.A. +352.429 Decl. -3.306 (ibex-sun)
error is R.A. +0.819 Decl. +4.768
for a total 4.838 deg
ibex_rotate -o -u 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:17:04:00:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988975,-0.145863,+0.025531
which is R.A. +351.610 Decl. +1.463
missing R.A. +356.326 Decl. -1.579 (ibex-sun)
error is R.A. +4.716 Decl. +3.042
for a total 5.611 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 280 apogee:
ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015/03:17:06:14:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998022,-0.056287,-0.027991
which is R.A. +356.772 Decl. -1.604
missing R.A. +356.410 Decl. -1.542 (ibex-sun)
error is R.A. +0.362 Decl. +0.062
for a total 0.367 deg
ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015-03-22T03:20:50.596Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.998022,-0.056287,-0.027991
which is R.A. +356.772 Decl. -1.604
missing R.A. +0.985 Decl. +0.392 (ibex-sun)
error is R.A. +355.787 Decl. +1.996
for a total 4.661 deg
No Lo O-mode.
There is no overlap with orbit 278 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: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Marty Quinn" <marty.quinn at unh.edu>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <robert.lockwood at orbitalatk.com>, "Ryan Tyler" <ryan.tyler at orbitalatk.com>, "Sheral Wesley" <sheral.wesley at orbitalatk.com>, "Tim Perry" <tim.perry at orbitalatk.com>
Sent: Monday, February 23, 2015 1:24:22 PM
Subject: IBEX Orbit# 279 ATS (8 Mar 15 - 17 Mar 15)
Guys,
Here are the planning files and ATS for Orbit# 279.
Please respond to this thread with your comments and approvals.
Approvals are required before 26 Feb 15 @1400 UTC
Note the following:
1. Orbit# 279 PERIGEE: Moderate Eclipse Commands
# 2015-03-17T20:35:32.930Z,PenumbraEntry,orbit:279
# 2015-03-17T20:35:32.930Z,EclipseEntry,moderate:true,long:false,orbit:279
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:17:18:40:00
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:17:22:00:00
# 2015-03-17T21:58:32.103Z,PenumbraExit,orbit:279
# 2015-03-17T21:58:32.103Z,EclipseExit,moderate:true,long:false,orbit:279
2. Moon in Lo FOV
# 2015-03-15T19:15:02.825Z,MoonInLoFovStart,orbit:279
# 2015-03-16T09:16:48.148Z,MoonInLoFovStop,orbit:279
3. Command Load Constraint Violation Report
IBEX_2015_067_o0279a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-015: Battery charge falls below minimum from 2015/03/17 21:29:32 UTC -
2015/03/17 21:58:32 UTC. Lowest charge level is 6047.318588
watt-minutes during this interval.
* Will set the long eclipse flag during this moderate eclipse
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:17:18:40:00
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:17:22:00:00
==============
OTHER MESSAGES
==============
NO MESSAGES.
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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