[Isocops] IBEX Orbit# 129 ATS set - modifications needed.
Mark Tapley
mtapley at swri.edu
Sun Jun 19 01:29:40 EDT 2011
All,
I have looked at the IBEx Orbit 129 ATS's, and most are OK
but I think there are problems with at least one.
IBEX_2011_Orbit129SpinDown_20June11_v001.txt
Commands look OK to me. I note that we allowed only 6 minutes
(Enable to Disable; 420 seconds Thrust-Time) for spin-up, but we
allow 13 minutes (Enable to Disable; 839 seconds Thrust-Time) for
spin-down. This seems curious to me, since the consequences of
over-spin-down seem more severe.
Otherwise, good.
IBEX_2011_Orbit129InertialManeuver_20June11_v002.txt
First 5 commands probably should not be there. All have
timestamps of 6/12 to 6/13, which dates have already passed (would
these hang command execution if loaded?) and most are inappropriate
for our S/C state now (CEU commands, FCT state to SCIENCE).
Also, the inertial direction given is:
0.035827, 0.919219, 0.392112 = RA: 87.768, Dec: 23.086
that is different from the vector I recommend to compensate
for the bias in inertial maneuvers and to point at sun 2.5 days
before perigee, which is:
+0.0542216, +0.918386, +0.391954 = RA: 86.62, Dec: 23.076
it's also different from what's in any STF I have. I actually
don't know where it came from, but I'd definitely like to know before
approving.
This file is not OK for the Inertial Maneuver.
IBEX_2011_21june11_BatteryBalCycles_v001.txt
No eclipses in the .oef, all other ATS's so far don't include
anything within an hour of the battery cycles - this one looks OK.
-------------------
No PL commands in any of the 3 loads, so no sun-pointing
worry (and the direction given for the inertial maneuver is easily
close enough to the desired vector to be power-safe). No Moon-in-FOV
concerns, no macros. I have not checked overlaps with previous ATS's.
No normal checklist, see CHelle's spin-down checklist.
--
- Mark 210-379-4635
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