[Isocops] IBEX Orbit# 199 ATS (9 Mar 13 - 19 Mar 13)

Tue Feb 26 19:59:22 EST 2013

I approve IBEX_2013_068_o0199a_v001.scr

This is the first time we have seen two sets of Moon in Lo FOV in one
orbit. I have asked Harald to include how the sessions matched up with
the Lo star sensor saturation in his orbit 199 SOH report.

Chelle

From: isocops-bounces at lists.sr.unh.edu
[mailto:isocops-bounces at lists.sr.unh.edu] On Behalf Of Nigel Angold
Sent: Tuesday, February 26, 2013 6:48 PM
To: fair-play at comcast.net
Cc: Thomas Regiec; IBEX-FDG; ISOC at New Hampshire; Bret Hautamaki; John
Cavallo; Sheral Wesley; Robert Lockwood; Ryan Tyler; Walker Cross; Tim
Perry; Ibex Mission Operations; IBEXOPS/ORB
Subject: Re: [Isocops] IBEX Orbit# 199 ATS (9 Mar 13 - 19 Mar 13)

Thanks Ken. That makes perfect sense. It's the first time I've seen
those commands reversed so I figured I should mention it.

Nigel

Nigel,

I'll take a shot at it.  The command generation software uses the
current ephemeris to determine the 14 Re crossing point:

ibex_orbit -r 199 -D 14 -R E

0199

2013/03:10:06:56:17 2013/03:18:16:45:58

The maneuver window opens at 14 Re + 0.5 hour and the software assumes
that the maneuver will occur when the window opens.  If you do the math,
you'll come up with

2013/03:18:16:15:58

The command generation software has a built-in 2 second delay that it
adds to each command so the time for the transition to housekeeping in
the STF/ATS is

2013/03:18:16:16:00

MPS uses the times that were created in the forecast STF for its time
determinations.  Times often shift somewhere between 1 and 2 minutes
with each ephemeris update so as the month wears on the differences
between the times in the current ephemeris and the forecast files grows
larger and we can see situations like the one you noticed.  We've seen
this before and as far as I know it isn't a problem.

Ken

________________________________

From: "Nigel Angold" <ngangold at earthlink.net>
To: "Ibex Mission Operations" <ibexops at gmail.com>
Cc: "Thomas Regiec" <regiec.thomas at orbital.com>, "IBEX-FDG"
<IBEX.fdg at applieddefense.com>, "ISOC at New Hampshire"
<isocops at lists.sr.unh.edu>, "Bret Hautamaki"
<hautamaki.bret at orbital.com>, "John Cavallo" <cavallo.john at orbital.com>,
"Tim Perry" <perry.tim at orbital.com>, "Robert Lockwood"
<Lockwood.Robert at orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>,
"Walker Cross" <Cross.Walker at orbital.com>, "Sheral Wesley"
<wesley.sheral at orbital.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>
Sent: Tuesday, February 26, 2013 5:36:46 PM
Subject: Re: [Isocops] IBEX Orbit# 199 ATS (9 Mar 13 - 19 Mar 13)

For the orbit 199 perigee maneuver, can anyone explain why the
Housekeeping command is after the Cat Bed Heater on command?

Does it matter?

The housekeeping command is 30min before 14 Re and the maneuver enable
is 24min 41s after 14 Re. The CBH on is the usual 55min before maneuver
enable.

Nigel

  @ECT_SetHTRCmd CATBED_5N_HTR,ON $TIME=2013/03:18:16:15:40

  @FCT_SetScState housekeeping $TIME=2013/03:18:16:16:00

  @ACT_SetKFInputSelect GND_CMD, 0, 0, 0, 0 $TIME=2013/03:18:17:00:40

  @ACT_SetEstUpdateEnables ENABLE, DISABLE $TIME=2013/03:18:17:00:41

  @FCT_SetFcMode burn $TIME=2013/03:18:17:07:40

  @ACT_SetInrDir 0.997648,-0.058205,-0.03619 $TIME=2013/03:18:17:08:40

  @ACT_SetLrTarget ACS_INERTIAL $TIME=2013/03:18:17:09:40

  @ACT_SetThrustTime 660 $TIME=2013/03:18:17:10:35

  @ACT_SetThrustEnable ENABLE $TIME=2013/03:18:17:10:40

  @ACT_SetThrustEnable DISABLE $TIME=2013/03:18:17:20:40

  @ECT_SetHTRCmd CATBED_5N_HTR,OFF $TIME=2013/03:18:17:20:41

  @ACT_SetThrustTime 0 $TIME=2013/03:18:17:21:10

  @ACT_SetStaticZrate ESTIMATOR, 0.418 $TIME=2013/03:18:17:35:50

  @ACT_SetKFInputSelect STA_PCT_VALID, 48,18,23,53
$TIME=2013/03:18:17:36:00

  @FCT_SetFcMode Mission $TIME=2013/03:18:17:36:40

	Guys,

	   Here are the planning files and ATS for Orbit# 199

	Please respond to this email thread with all approvals and
questions.

	Approvals and questions are required before 27 Feb 13 @1800 UTC

	Note the following:

	1. There are NO Battery Balancing Commands this orbit

	2. APL-18 SSR_Dump contact on 18 Mar 13 @1900 UTC

	3. Command Load Constraint Violation Report (CCVR)

	==========================
	HARD CONSTRAINT VIOLATIONS
	==========================
	NO VIOLATIONS.

	==========================
	SOFT CONSTRAINT VIOLATIONS
	==========================
	NO VIOLATIONS.

	==============
	OTHER MESSAGES
	==============
	NO MESSAGES.

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

<IBEX_2013_068_o0199a_v001.txt><IBEX_2013_068_o0199a_v001.ccvr><IBEX_201
3_068_o0199a_v001.oef><IBEX_Orbit199Contacts.txt>

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