[Isocops] IBEX Orbit# 89 ATS (11 - 19 Aug 10)
Mark Tapley
mtapley at swri.edu
Mon Aug 2 17:28:38 EDT 2010
All,
looked over the ATS; I approve.
IBEX-Lo PMT levels are reduced over a span centered within
the moon-in-FOV prediction, with the prediction overlapping by about
an hour and a half either end.
Ascending and Descending macros execute at proper times WRT
15-RE crossings.
Times for contacts match ground times to ~6 seconds before
clock set and to ~0 seconds after.
I'm curious, after the data-dump contact and the inertial
pointing, will the batteries be partially discharged? That's when the
battery cell-balancing operation starts.
The pointing maneuver from the last ATS points us in safe
directions for this ascent and descent (assuming it worked within 1.3
degrees of how it was supposed to):
[tapley at ena ~]$ ibex_rotate -o -u
-0.7605915023455401,0.5955181949147713,0.2585703890340242 -w ibex-sun
-t 2010/08:12:01:38:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.760592,+0.595518,+0.258570
which is R.A. +141.940 Decl. +14.985
missing R.A. +141.534 Decl. +15.111 (ibex-sun)
error is R.A. +0.406 Decl. +0.126
for a total 0.412 deg
[tapley at ena ~]$ ibex_rotate -o -u
-0.7605915023455401,0.5955181949147713,0.2585703890340242 -w ibex-sun
-t 2010/08:18:22:34:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.760592,+0.595518,+0.258570
which is R.A. +141.940 Decl. +14.985
missing R.A. +147.998 Decl. +12.922 (ibex-sun)
error is R.A. +6.058 Decl. +2.063
for a total 6.230 deg
and the pointing maneuver for this ATS will point us in safe
directions for the following orbit (assuming it works and according
to times in the Forecast .oef
IBEX_2010_Forecast_15July10-23Oct10_v001.oef):
[tapley at ena ~]$ ibex_rotate -o -u
-0.838435174952733,0.49988680035188543,0.2171166604292126 -w ibex-sun
-t 2010-08-19T14:02:38.162Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.838435,+0.499887,+0.217117
which is R.A. +149.196 Decl. +12.540
missing R.A. +148.570 Decl. +12.754 (ibex-sun)
error is R.A. +0.626 Decl. +0.215
for a total 0.647 deg
[tapley at ena ~]$ ibex_rotate -o -u
-0.838435174952733,0.49988680035188543,0.2171166604292126 -w ibex-sun
-t 2010-08-26T20:09:43.012Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.838435,+0.499887,+0.217117
which is R.A. +149.196 Decl. +12.540
missing R.A. +155.269 Decl. +10.261 (ibex-sun)
error is R.A. +6.073 Decl. +2.279
for a total 6.374 deg
At 18:31 -0400 8/1/10, Ibex Mission Operations wrote:
>Guys,
> Please review the ATS for Orbit# 89 (11 - 19 Aug 10). The ATS
>will be uploaded during perigee of Orbit# 87
>
>Orbit# 87 Perigee Contacts are listed below in UTC
>IBEX,AUWA01,ADD,08/03/10,215,16:00:00,08/03/10,215,16:35:00,,LAHO
>320K IBEX Orbit# 87 SSR_Dump/Tracking Contact
>IBEX,USHI01,ADD,08/04/10,216,06:00:00,08/04/10,216,06:35:00,,LAHO
>64K IBEX Orbit# 87 Tracking Contact
>
>
>
>--
>Sheral R. Wesley
>SPVR., Satellite Operations
>IBEX Mission OPS
>(304) 279-6678
>
>
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--
- Mark 210-379-4635
-----------------------------------------------------------------------
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