[Isocops] IBEX Orbit# 272 ATS (2 Jan 15 - 12 Jan 15) - v001 approval
Harald Kucharek
kucharek at atlas.sr.unh.edu
Sat Dec 27 18:34:03 EST 2014
Hi All,
I approve orbit 272 ATS for IBEX-lo.
Best,
Harald
On Dec 24, 2014, at 1:08 AM, Ken Fairchild wrote:
> All,
>
> I have looked at the orbit 272 ATS,
>
> IBEX_2015_002_o0272a_v001.scr,
>
> and I approve.
>
> There are no constraint violations in
>
> IBEX_2015_002_o0272a_v001.ccvr.
>
> The PL commands in the v001 ATS match those in the v003 STF,
>
> IBEX_2015_002_o0272a_v003.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_002_o0272a_v001.oef,
>
> and as verified with ibex_orbit.
>
> There is one star tracker outage. The outage starts about 14 1/2 hours after 15 Re ascending and runs for over 3 days (thus delaying the apogee maneuver). Some despinning may be required due to these outages.
>
> There is one moon in Lo FOV session in arc B. The ATS start time is about 2 1/2 hours before that in the OEF and the ATS and OEF end times are the same. Differences in the timing are not unusual.
>
> The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
>
> IBEX_Orbit272Contacts.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 271 left us pointing in safe directions for the orbit 272 arc A ascending and descending sequences:
>
> ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015/01:03:09:44:05
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.229904,-0.922231,-0.310859
> which is R.A. +283.998 Decl. -18.111
> missing R.A. +283.600 Decl. -22.855 (ibex-sun)
> error is R.A. +0.398 Decl. +4.744
> for a total 4.758 deg
>
> ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015/01:07:15:04:45
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.229904,-0.922231,-0.310859
> which is R.A. +283.998 Decl. -18.111
> missing R.A. +288.147 Decl. -22.424 (ibex-sun)
> error is R.A. +4.149 Decl. +4.313
> for a total 5.808 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 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:07:16:47:32
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.300288,-0.904331,-0.303335
> which is R.A. +288.369 Decl. -17.658
> missing R.A. +288.224 Decl. -22.414 (ibex-sun)
> error is R.A. +0.145 Decl. +4.756
> for a total 4.758 deg
>
> ibex_rotate -o -u 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:07:18:22:59
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.300288,-0.904331,-0.303335
> which is R.A. +288.369 Decl. -17.658
> missing R.A. +288.295 Decl. -22.406 (ibex-sun)
> error is R.A. +0.074 Decl. +4.748
> for a total 4.748 deg
>
> ibex_rotate -o -u 0.300288,-0.904331,-0.303335 -w ibex-sun -t 2015/01:11:20:06:02
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.300288,-0.904331,-0.303335
> which is R.A. +288.369 Decl. -17.658
> missing R.A. +292.736 Decl. -21.783 (ibex-sun)
> error is R.A. +4.367 Decl. +4.125
> for a total 5.822 deg
>
> The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 273 apogee:
>
> ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015/01:11:22:20:17
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.388285,-0.874648,-0.290218
> which is R.A. +293.938 Decl. -16.871
> missing R.A. +292.844 Decl. -21.766 (ibex-sun)
> error is R.A. +1.094 Decl. +4.895
> for a total 5.003 deg
>
> ibex_rotate -o -u 0.388285,-0.874648,-0.290218 -w ibex-sun -t 2015-01-16T22:53:24.231Z
> Quaternion +0.000000,+0.000000,+0.000000,+0.000000
> points axis +1.000000,+0.000000,+0.000000
> towards ECI +0.388285,-0.874648,-0.290218
> which is R.A. +293.938 Decl. -16.871
> missing R.A. +298.265 Decl. -20.932 (ibex-sun)
> error is R.A. +4.327 Decl. +4.061
> for a total 5.766 deg
>
> Lo O-mode in all of arc B (plan 6,7,1,1). There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence.
>
> There is no overlap with orbit 271 commands by manual inspection or by checking at
>
> http://ibex.unh.edu/cgi-bin/ats.cgi.
>
> Command Approval Checklist is attached.
>
> Ken
>
> 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" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
> Sent: Monday, December 22, 2014 12:22:42 AM
> Subject: IBEX Orbit# 272 ATS (2 Jan 15 - 12 Jan 15)
>
> Guys,
> Here are the planning files and ATS for Orbit# 272. Please respond to this email thread with your comments and approvals.
> Approvals are required before 24 Dec 14 @0000 UTC.
>
> Note the following:
> 1. IBEX_Lo Cross Calibration
> CEU_LO_SCIENCE_MODE OXYGEN
>
> 2. Moon in Lo FOV
> # 2015-01-11T17:14:15.068Z,MoonInLoFovStart,orbit:272
> # 2015-01-11T18:39:43.675Z,MoonInLoFovStop,orbit:272
>
> 3. Battery Balancing at PERIGEE
> SetLongEclipseFlag TRUE $TIME=2015/01:12:07:00:00
> SetLongEclipseFlag FALSE $TIME=2015/01:12:08:30:00
>
> 4. Command Load Constraint Violation Report
> IBEX_2015_002_o0272a_v001.scr
> ==========================
> HARD CONSTRAINT VIOLATIONS
> ==========================
> NO VIOLATIONS.
> ==========================
> SOFT CONSTRAINT VIOLATIONS
> ==========================
> ==============
> OTHER MESSAGES
> ==============
> NO MESSAGES.
>
>
> --
> Sheral R. Wesley
> SPVR., Satellite Operations
> IBEX Mission OPS
> CYGNUS Mission Planning
> (304) 279-6678
>
> <IBEX-Command-Approval-Checklist-Rev14-o0272_KWF.doc>
> Please restrict discussions on this email list to non-ITAR sensitive topics.
> ______________________________________________
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> Isocops at lists.sr.unh.edu
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