[Isocops] IBEX Orbit# 118 v002 ATS - approve

Thu Mar 10 18:06:13 EST 2011

All,
	I have looked at the Orbit 118 ATS v002 
(IBEX_2011_079_00_00_v002.txt) and I approve.

	The portentious "PL mode unknown" constraint violation 
messages appear near the beginning of the orbit, as always. I worry 
more about this now than I used to.

	The PL commands in the ATS v001 match the STF v002 file 
(IBEX_2011_079_19_43_v002.stf) per Ken's script. Diff shows that ATS 
v002 differs from ATS v001 only by deletion of a contact and 
associated commands, not any of the PL commands, so ATS v002 also 
matches STF v002 for payload commands.

	PL ascending operations make sense WRT 15 Re ascending time. 
PL descending is correct for the early descent due to ACS-SUN 
maneuver at the start of the orbit (to eliminate chance of 
sun-viewing, given 1 degree deadband to a 7.25 degree sun exclusion 
angle).

	Moon in -Lo FOV PMT setback commands have been commented out 
of the STF because they would occur after the new, earlier descending 
macros and correctly do not appear in the ATS.


*****	Ground station times show some inconsistencies:

   @FMI_SetBilevelOutputControlReg COHERENT,ON $TIME=2011/03:21:17:08:06
   @ECT_SetRelay stx,off $TIME=2011/03:21:17:47:00

	does not exactly match

IBEX,USHI01,ADD,03/21/11,080,17:00:00,03/21/11,080,17:35:00,,LAHO 2K 
IBEX Orbit# 117 Post Burn Contact

	and there is no S/C scheduled contact for

IBEX,APL,ADD,03/23/11,082,16:00:00,03/23/11,082,16:45:00,46_Re 
Ascending 2K IBEX Orbit# 118 Apogee/Link Margin Contact

	other contacts match. Later emails show those contact times 
have been corrected/deleted.


	Battery cell balancing is more than 1 hour from anything.


	ACS-Sun sun-pointing maneuver at the beginning of the orbit, ends at
2011/03:20:23:03:00
	this time is *after*
2011-03-20T19:43:32.131Z
	which is the time assumed for the maneuver in producing the 
STF v002. Therefore this maneuver will result in *smaller* sun angles 
than predicted for the STF, and is safe for the duration of this 
orbit until the descending macros take place. The predicted maximum 
sun angle (including a 1 degree deadband for the maneuver) at 
conclusion of the descending macros is 7.081 degrees, which is less 
than 7.25 degrees:

[tapley at ena ~]$ ibex_rotate -o -w ibex-sun -t 2011/03:20:23:03:00
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +1.000000,+0.000000,+0.000000
  which is     R.A.   +0.000 Decl.  +0.000
  missing      R.A. +359.870 Decl.  -0.045 (ibex-sun)
  error is     R.A. +359.870 Decl.  +0.045
  for a total  0.137 deg
[tapley at ena ~]$ ibex_rotate -o -r +359.870 -d  -0.045 -w ibex-sun -t 
2011/03:27:02:37:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.999997,-0.002269,-0.000785
  which is     R.A. +359.870 Decl.  -0.045
  missing      R.A.   +5.468 Decl.  +2.335 (ibex-sun)
  error is     R.A. +354.402 Decl.  +2.380
  for a total  6.081 deg


	There is an inertial sun-pointing maneuver at the end of this 
orbit. That maneuver leaves us pointing safe directions at conclusion 
of the maneuver, at the following ascending time, and at the 
descending time following that.

[tapley at ena ~]$ ibex_rotate -o -u 
0.9906740026867388,0.12497113656152499,0.05428844653474853 -w 
ibex-sun -t 2011/03:27:19:16:22
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.990674,+0.124971,+0.054288
  which is     R.A.   +7.190 Decl.  +3.112
  missing      R.A.   +6.075 Decl.  +2.610 (ibex-sun)
  error is     R.A.   +1.115 Decl.  +0.502
  for a total  1.222 deg
[tapley at ena ~]$ ibex_rotate -o -u 
0.9906740026867388,0.12497113656152499,0.05428844653474853 -w 
ibex-sun -t 2011-03-28T09:35:04.947Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.990674,+0.124971,+0.054288
  which is     R.A.   +7.190 Decl.  +3.112
  missing      R.A.   +6.645 Decl.  +2.884 (ibex-sun)
  error is     R.A.   +0.544 Decl.  +0.229
  for a total  0.590 deg
[tapley at ena ~]$ ibex_rotate -o -u 
0.9906740026867388,0.12497113656152499,0.05428844653474853 -w 
ibex-sun -t 2011-04-04T12:08:37.908Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.990674,+0.124971,+0.054288
  which is     R.A.   +7.190 Decl.  +3.112
  missing      R.A.  +13.102 Decl.  +5.591 (ibex-sun)
  error is     R.A.   +5.912 Decl.  +2.479
  for a total  6.394 deg


	No more O-mode.

	No overlap with Orbit 117 commands, and the last Orbit 117 
command leaves the SC in "housekeeping" mode consistent with the 
initial ACS_SUN maneuver.

	I have attached the Sun-Maneuver checklist and Command 
generation checklist, names changed slightly so it should not 
overwrite anyone else's copy. I have filled in in green text the 
tasks I think I checked off today.


At 13:39 -0500 3/10/11, Ibex Mission Operations wrote:
>V002 of the Orbit# 118 ATS has been submitted for your approval.
>The following commands were removed.  If needed, the contact will be 
>a Blind Acquisition.

-- 
						- Mark     210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:

				Think of it as Evolution in Fast-Forward.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Sun-Man-Chk_o118_3_10.doc
Type: application/msword
Size: 176128 bytes
Desc: not available
Url : http://lists.sr.unh.edu/mailman/private/isocops/attachments/20110310/cf5cbfc3/attachment-0002.doc 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Cmd-Approv-o118.doc
Type: application/msword
Size: 114176 bytes
Desc: not available
Url : http://lists.sr.unh.edu/mailman/private/isocops/attachments/20110310/cf5cbfc3/attachment-0003.doc