[Isocops] (no subject)

Fri Jul 11 15:28:51 EDT 2014

All,

I have looked at the orbit 254 ATS,

IBEX_2014_205_o0254a_v001.scr,

and I approve.

There are no constraint violations in

IBEX_2014_205_o0254a_v001.ccvr.

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

IBEX_2014_205_o0254a_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_2014_205_o0254a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  It starts about 1 hour and 3/4  after 10
Re descending and ends about 1 3/4 hours after perigee.  No despinning
should be required due to this outage as we'll have descended before it
starts.

There are no moon in Lo FOV sessions in arc A or B.

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

IBEX_Sch_Req2014_Orbit254_v001, normally called IBEX_OrbitXXXContacts.txt.

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 253 left us pointing in safe
directions for the orbit 254 arc A ascending and descending sequences:

ibex_rotate -o -u -0.480849,0.808363,0.339608 -w ibex-sun -t
2014/07:24:14:57:59
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.480849,+0.808363,+0.339608
 which is     R.A. +120.746 Decl. +19.853
 missing      R.A. +123.640 Decl. +19.839 (ibex-sun)
 error is     R.A.   +2.894 Decl.  +0.014
 for a total  2.722 deg

ibex_rotate -o -u -0.480849,0.808363,0.339608 -w ibex-sun -t
2014/07:28:05:24:12

Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.480849,+0.808363,+0.339608
 which is     R.A. +120.746 Decl. +19.853
 missing      R.A. +127.233 Decl. +19.007 (ibex-sun)
 error is     R.A.   +6.487 Decl.  +0.846
 for a total  6.176 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 -0.544995,0.773238,0.324165 -w ibex-sun -t
2014/07:28:07:07:20
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.544995,+0.773238,+0.324165
 which is     R.A. +125.177 Decl. +18.915
 missing      R.A. +127.305 Decl. +18.991 (ibex-sun)
 error is     R.A.   +2.128 Decl.  +0.076
 for a total  2.014 deg

ibex_rotate -o -u -0.544995,0.773238,0.324165 -w ibex-sun -t
2014/07:28:08:42:26
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.544995,+0.773238,+0.324165
 which is     R.A. +125.177 Decl. +18.915
 missing      R.A. +127.371 Decl. +18.975 (ibex-sun)
 error is     R.A.   +2.194 Decl.  +0.060
 for a total  2.076 deg

ibex_rotate -o -u -0.544995,0.773238,0.324165 -w ibex-sun -t
2014/08:01:18:55:29
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.544995,+0.773238,+0.324165
 which is     R.A. +125.177 Decl. +18.915
 missing      R.A. +131.725 Decl. +17.936 (ibex-sun)
 error is     R.A.   +6.548 Decl.  +0.979
 for a total  6.289 deg

The inertial maneuver at perigee leaves us pointing in safe directions at
the time of the maneuver and at orbit 255 apogee:
ibex_rotate -o -u -0.608546,0.731931,0.306509 -w ibex-sun -t
2014/08:01:20:58:39
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.608546,+0.731931,+0.306509
 which is     R.A. +129.741 Decl. +17.849
 missing      R.A. +131.804 Decl. +17.917 (ibex-sun)
 error is     R.A.   +2.063 Decl.  +0.068
 for a total  1.964 deg

ibex_rotate -o -u -0.608546,0.731931,0.306509 -w ibex-sun -t
2014-08-06T18:47:28.855Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
 points axis  +1.000000,+0.000000,+0.000000
 towards ECI  -0.608546,+0.731931,+0.306509
 which is     R.A. +129.741 Decl. +17.849
 missing      R.A. +136.490 Decl. +16.585 (ibex-sun)
 error is     R.A.   +6.749 Decl.  +1.264
 for a total  6.569 deg

No Lo O-mode.

There is no overlap with orbit 253 commands by manual inspection or by
checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Marty (with special thanks to Ken)

Marty Quinn
GISLAB/Space Science Center UNH
marty.quinn at unh.edu <marty at drsrl.com>
603 988-7107

On Thu, Jul 10, 2014 at 3:04 PM, Ibex Mission Operations <ibexops at gmail.com>
wrote:

> All,
>   Here are the planning files and ATS for Orbit# 254
> Please respond to this email thread with your questions and approvals.
> *Approvals are required before COB 11 July 14 @ 2200 UTC*
>
> Timothy E. Perry
> CYGNUS Mission Planning
> IBEX Mission Ops Lead
> OCO-2 Flight Director
> perry.tim at orbital.com
> Office: (703) 406-5976
> Cell:(301) 606-1430
>
>
>
>
>
>
> Please restrict discussions on this email list to non-ITAR sensitive
> topics.
> ______________________________________________
> Isocops mailing list
> Isocops at lists.sr.unh.edu
> http://lists.sr.unh.edu/mailman/listinfo/isocops
>
>
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