[Isocops] IBEX Orbit# 229 ATS (8 Dec 13 - 17 Dec 13) - v001 approval

Reno, Michelle mreno at swri.edu
Thu Nov 28 23:22:18 EST 2013


I approve IBEX_2013_342_o0229a_v001.scr,
________________________________
From: Ken Fairchild [fair-play at comcast.net]
Sent: Wednesday, November 27, 2013 9:45 PM
To: Ibex Mission Operations
Cc: joe at boulder.swri.edu; IBEX-FDG; IBEXOPS/ORB; ISOC at New Hampshire; John Cavallo; Tapley, Mark; Nigel Angold; Robert Lockwood; Roland Vanderspek; Ryan Tyler; Sheral Wesley; Thomas Regiec; Tim Perry; Reno, Michelle; Ken Fairchild
Subject: Re: IBEX Orbit# 229 ATS (8 Dec 13 - 17 Dec 13) - v001 approval

All,

I have looked at the orbit 229 ATS,

IBEX_2013_342_o0229a_v001.scr,

and I approve.

There are no constraint violations in

IBEX_2013_342_o0229a_v001.ccvr.

The PL commands in the v001 ATS match those in the v002 STF,

IBEX_2013_342_o0229a_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_2013_342_o0229a_v001.oef,

and as verified with ibex_orbit.

There are three star tracker outages.  The first starts about 40 minutes after 15 Re ascending and ends about 26 hours later.  The second starts about a day and a half after the first outage ends and ends 4+ days later. The third starts about 13 hours after the second outage ends and ends about 1 hour before 15 Re ascending in orbit 230.  Despinning will be required due to these outages.

There are no moon in Lo FOV sessions.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit229Contacts.txt,

for all contacts (4).

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 228 left us pointing in safe directions for orbit 229 arc A ascending and descending sequences:

ibex_rotate -o -u -0.273158,-0.878577,-0.391775 -w ibex-sun -t 2013/12:09:07:21:50
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.273158,-0.878577,-0.391775
 which is     R.A. +252.729 Decl. -23.065
 missing      R.A. +256.102 Decl. -22.824 (ibex-sun)
 error is     R.A.   +3.373 Decl.  +0.241
 for a total  3.116 deg

ibex_rotate -o -u -0.273158,-0.878577,-0.391775 -w ibex-sun -t 2013/12:13:06:09:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.273158,-0.878577,-0.391775
 which is     R.A. +252.729 Decl. -23.065
 missing      R.A. +260.320 Decl. -23.173 (ibex-sun)
 error is     R.A.   +7.591 Decl.  +0.108
 for a total  6.981 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 +260.402 -d -23.178 -w ibex-sun -t 2013/12:13:07:57:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.153277,-0.906418,-0.393589
 which is     R.A. +260.402 Decl. -23.178
 missing      R.A. +260.402 Decl. -23.178 (ibex-sun)
 error is     R.A.   +0.000 Decl.  +0.000
 for a total  0.000 deg

ibex_rotate -o -r +260.402 -d -23.178 -w ibex-sun -t 2013/12:13:09:27:19
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.153277,-0.906418,-0.393589
 which is     R.A. +260.402 Decl. -23.178
 missing      R.A. +260.470 Decl. -23.182 (ibex-sun)
 error is     R.A.   +0.068 Decl.  +0.004
 for a total  0.063 deg

ibex_rotate -o -r +260.402 -d -23.178 -w ibex-sun -t 2013/12:17:07:14:26
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.153277,-0.906418,-0.393589
 which is     R.A. +260.402 Decl. -23.178
 missing      R.A. +264.871 Decl. -23.351 (ibex-sun)
 error is     R.A.   +4.469 Decl.  +0.173
 for a total  4.109 deg

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 230 apogee:

ibex_rotate -o -r +264.981 -d -23.353 -w ibex-sun -t 2013/12:17:09:26:33
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.080319,-0.914560,-0.396395
 which is     R.A. +264.981 Decl. -23.353
 missing      R.A. +264.981 Decl. -23.353 (ibex-sun)
 error is     R.A.   +0.000 Decl.  +0.000
 for a total  0.000 deg

ibex_rotate -o -r +264.981 -d -23.353 -w ibex-sun -t 2013/12:22:09:05:04
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.080319,-0.914560,-0.396395
 which is     R.A. +264.981 Decl. -23.353
 missing      R.A. +270.433 Decl. -23.471 (ibex-sun)
 error is     R.A.   +5.452 Decl.  +0.118
 for a total  5.004 deg

No Lo O-mode.

There is no overlap with orbit 228 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi<https://urldefense.proofpoint.com/v1/url?u=http://ibex.unh.edu/cgi-bin/ats.cgi&k=PCy7eyfFfObklJZLFhSrcw%3D%3D%0A&r=XooAroO9usCVqglw4h5GLw%3D%3D%0A&m=o2fecaJGN8IA8QlY3m67%2BUg7%2BMplcI6A%2FWaFLWK83wU%3D%0A&s=7de991d072a58f77a35458f350a71258343850b83deda13a39ae2396ada38211>.

Command Approval Checklists are attached.

Ken

________________________________
From: "Ibex Mission Operations" <ibexops at gmail.com>
To: joe at boulder.swri.edu, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
Sent: Monday, November 25, 2013 7:12:17 PM
Subject: IBEX Orbit# 229 ATS (8 Dec 13 - 17 Dec 13)

Guys,
    Here are the planning files and ATS for ORbit# 229.
Please respond to this email thread with any question, comments and approvals.
Your approvals are required before 28 Nov 13 @1800 UTC

Note the following:
1.Battery Balancing Commands at Perigee
SetLongEclipseFlag TRUE $TIME=2013/12:17:17:00:00
SetLongEclipseFlag FALSE $TIME=2013/12:17:18:30:00

2. Sun Maneuver Commands at Apogee and Perigee
2013-12-11T20:47:17.335Z,StarTrackerOutageStart,dueTo:moon,orbit:229
2013-12-18T05:44:00.000Z,StarTrackerOutageStop,dueTo:moon,orbit:229


3. Command Load Constraint Violation Report (CCVR)

#   IBEX_2013_342_o0229a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==============
OTHER MESSAGES
==============
NO MESSAGES.



--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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