[Isocops] IBEX Goat Herder for 18 & 19 August 2020

[Perry, Timothy E [US] (IS)]

All,
   The perigee contacts were nominal for CMD and TLM with the exception of the beginning of the USHI01 contact DOY231 @1700. The USHI01 contact @1700 DOY 231 was unable to get bit sync lock on the downlink data stream. USHI02 was made available and we were able to switch over to the station and finish the planned time and procedure that was being run. I will contact SSC in the morning to get a DR number.
    Since the master reset we have been planning to check the known bad locations on the SSRA and see if the reset had cleared the bad locations. We scheduled 3 contacts 2 @1.5 hours and 1 @ 1 hour. We performed the nominal perigee SSR dump. Then we set the pointers to 47000 let it record for a while then dumped the data. The second time we set the pointers 66000, let it record and dump the suspect locations. We also dumped the flight computer back orbit data after each time we set the pointers. All the data has been archived and is being analyzed for bad or missing data locations.
   The Orbit 499 Instrument ATS has been uplinked. The 18 day timer command executed and the counter was reset back to 10.

Tasks that were accomplished:
CAR # 1108 - Dump Orbit 496 SSR missing blocks
CAR # 1109 - ATS Upload - IBEX_2020_241_o0499a_INST_V001 46 Cmds
CAR # 1110 - Dump Orbit 497 SSR data and reset SSR read & write pointers to test bad SSR Blocks
2 Flight Computer Back Orbit data dump



Results from the Inertial Maneuver:
Q1 0.20823100 ActNor.EstInrToBdy[0]
Q2 -0.58058000 ActNor.EstInrToBdy[1]
Q3 -0.63493900 ActNor.EstInrToBdy[2]
Q4 0.46520900 ActNor.EstInrToBdy[3]

GPS sec 1281845165 ActNor.EstTime

UTC time 08/19/2020 04:05:51 output
MPS Diff 0.786 deg

MPS Cmd Vector X -0.808309000
MPS Cmd Vector Y 0.543673000
MPS Cmd Vector Z 0.225954000

CSS Angle TLM 0.716525
CSS Sun-Pointing Angle 1.43305
  14 Aug 20 @ 10:00

CSS Angle TLM 0.300666
CSS Sun-Pointing Angle 0.601332
  19 Aug 20 @ 04:00

Pre-Burn
Thruster 1 2256 14 Aug 20 @ 10:00
Thruster 2 2192
Thruster 3 2608
Thruster 4 2672
Post-Burn   `
Thruster 1 2560 19 Aug 20 @ 04:00
Thruster 2 2464
Thruster 3 2912
Thruster 4 3008
Number of Pulses
Thruster 1 304
Thruster 2 272
Thruster 3 304
Thruster 4 336
Thruster Pairs
Thruster 1 & 2 576
Thruster 3 & 4 640




Timothy E. Perry
Mission Operations
CRS, IBEX, OCO-2
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
Cell (301) 606-1430

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