All,

We completed the series of 3 USAK01 contacts for testing changes to improve our tracking data. During the USAK01 contact 15Aug22 @18:00 I set the spacecraft clock and the star tracker spin rate jumped to 30.2 rpm. This value stayed there for the duration of the pass. On the following USAK01 pass @20:30 we changed the Kalman filter input to ground command and set the values to zero and disabled the star tracker input. Using just the static Z rate the spin rate started to come down but it never settled out. On the final pass of the night USAK01 08/16/22@02:30 we enabled the star tracker spin rate and disabled the static z rate and the value stabilized at the 4.177 spin rate and residuals were low. We changed the Kalman filter input back to STA_PCT_VAL and the ACE looked nominal. We watched it for the duration of the pass and it stayed solid.

Tasks Accomplished:

SSR Dump -> Dump New

Set Spacecraft Clock

Reset FDC Totals

Reset 18 Day timer

CAR # 1258 Orbit 579 ATS uplink

IBEX_2022_237_o0579a_v001 98 commands

CAR 1257 Redump Orbit 576 SSR Data – Dumped 17136 blocks of 26390 blocks

Will dump the rest on the next orbit

Star tracker issue troubleshooting

Results from the Inertial Maneuver:

Q1 -0.48704600 ActNor.EstInrToBdy[0]

Q2 0.36519700 ActNor.EstInrToBdy[1]

Q3 0.79329000 ActNor.EstInrToBdy[2]

Q4 0.01037000 ActNor.EstInrToBdy[3]

GPS sec 1344617486 ActNor.EstTime

UTC time 08/15/2022 16:51:12 output

MPS Diff 0.800 deg

MPS Cmd Vector X -0.769676000

MPS Cmd Vector Y 0.589292000

MPS Cmd Vector Z 0.245629000

CSS Angle TLM 0.454134

CSS Sun-Pointing Angle 0.908268

11 Aug 22 @02:00:00

CSS Angle TLM 0.775817

CSS Sun-Pointing Angle 1.551634

15 Aug 22 @16:30:00

Pre-Burn

Thruster 1 3888 11 Aug 22 @02:00:00

Thruster 2 3792

Thruster 3 4416

Thruster 4 4512

Post-Burn

Thruster 1 4176 15 Aug 22 @16:30:00

Thruster 2 4080

Thruster 3 4720

Thruster 4 4816

Number of Pulses

Thruster 1 288

Thruster 2 288

Thruster 3 304

Thruster 4 304

Thruster Pairs

Thruster 1 & 2 576

Thruster 3 & 4 608