[Isocops] IBEX Orbit# 108 ATS - approve

Lisa Policastri lisa at applieddefense.com
Sun Dec 26 13:58:47 EST 2010


Mark -

Regarding your note:  	PL operations all make sense WRT 15 Re times,
ascending and descending. They are a few minutes off, probably consonant
with the amount of time indicated by the failed along-track ephemeris check
this week. When I finally get around to checking what causes those, I'll
investigate this one as well.

Please let me know which ephem files you were comparing the PL ops times
from ... this failed along-track issue should not happen.

Thanks!
Lisa

___________________
Lisa Policastri
Applied Defense Solutions
lisa at applieddefense.com
office 301.483.4910
voicemail ext. 24
mobile 443.388.0526


-----Original Message-----
From: Mark Tapley [mailto:mtapley at swri.edu] 
Sent: Friday, December 24, 2010 2:53 PM
To: Ibex Mission Operations; Bret Hautamaki; IBEX-FDG; IBEXOPS/ORB; ISOC at
New Hampshire; John Cavallo; Mark Tapley; Mark Tapley; Robert Lockwood;
Roland Vanderspek; Ryan Tyler; Sheral Wesley; Thomas Regiec; Tim Perry;
Walker Cross
Cc: mreno at swri.edu; nschwadron at guero.sr.unh.edu
Subject: Re: IBEX Orbit# 108 ATS - approve

All,
	I have looked at the Orbit 108 ATS v001 
(IBEX_2011_003_00_00_v001.txt) and I approve.

	The standard "PL mode unknown at the beginning" constraint 
violation is the only one.

	The PL commands match the STF v001 file 
(IBEX_2011_003_16_53_v001.stf) per Ken's script.

	PL operations all make sense WRT 15 Re times, ascending and 
descending. They are a few minutes off, probably consonant with the 
amount of time indicated by the failed along-track ephemeris check 
this week. When I finally get around to checking what causes those, 
I'll investigate this one as well.

	Ground station times line up nicely with the transmitter on times.

	Battery cell balancing is > 1 hour from anything.

	The sun-pointing maneuver leaves us in a safe direction at 
the time of the maneuver and at succeeding ascent and descent, and 
takes place about 14.5 hours before the beginning of ST outage:

2011-01-03T19:54:04.317Z,StarTrackerOutageStart,orbit:108,dueTo:earth

[tapley at ena ~]$ ibex_rotate -o -u 
0.36487330742800744,-0.8543419494752005,-0.37009093868056353 -w 
ibex-sun -t 2011/01:11:04:53:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.364873,-0.854342,-0.370091
  which is     R.A. +293.126 Decl. -21.721
  missing      R.A. +292.102 Decl. -21.900 (ibex-sun)
  error is     R.A.   +1.024 Decl.  +0.179
  for a total  0.967 deg
[tapley at ena ~]$ ibex_rotate -o -u 
0.36487330742800744,-0.8543419494752005,-0.37009093868056353 -w 
ibex-sun -t 2011-01-11T19:57:33.318Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.364873,-0.854342,-0.370091
  which is     R.A. +293.126 Decl. -21.721
  missing      R.A. +292.797 Decl. -21.769 (ibex-sun)
  error is     R.A.   +0.330 Decl.  +0.047
  for a total  0.310 deg
[tapley at ena ~]$ ibex_rotate -o -u 
0.36487330742800744,-0.8543419494752005,-0.37009093868056353 -w 
ibex-sun -t 2011-01-18T11:10:22.186Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.364873,-0.854342,-0.370091
  which is     R.A. +293.126 Decl. -21.721
  missing      R.A. +299.907 Decl. -20.619 (ibex-sun)
  error is     R.A.   +6.781 Decl.  +1.103
  for a total  6.418 deg

	No O-mode until orbit 110.

	ST outage scheduled for 12 hours after the inertial pointing
maneuver.

At 0:37 -0500 12/23/10, Ibex Mission Operations wrote:
>Guys,
>      Here is the ATS and planning files for Orbit# 108.
>I need ATS comments/approvals by COB Friday 24 Dec 10.  Please 
>notify Tim Perry of any changes needed for approval

-- 
						- Mark     210-379-4635
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