[Isocops] IBEX Goat Herder for July 19 & 20 2023

Thu Jul 20 09:04:17 EDT 2023

All,

   The first contact was failed due to a high error rate for both VCID0 & VCID2 data. I did schedule up some extra contacts for the next orbit to try and recover some of the lost data from today's contact.  The new contacts will be posted below this message. The contact had to be cut short due to power constraints. The contact was originally scheduled to run prior to the beginning of the planned inertial maneuver. Since we lost the dump contact on the last orbit, this contact was extended for an extra hour. Unfortunately, this meant that we would be in communications during the turn on of the cat bed heaters. This was too much for the battery to handle. During second hour the cat bed heaters turned on and power started to drop. The transmitter was turned off @16:07:29 GMT to conserve power. The next orbit's view period for high rate down link is a lot longer than this orbit. The plan is to schedule a couple contacts to recover the lost data.

    At AOS it was noted that the star tracker had reset in the back orbit. The latch errors and FDC totals were reset and the star tracker in operating nominally.

    The second contact and the perigee inertial maneuver were successful. During the contact I was able to dump the flight computer back orbit data. The Orbit 616 ATS was uplinked.

Here are the additional contacts for Orbit 615 SSR Dumps:

IBEX,USHI02,ADD,07/28/23,209,11:00:00,07/28/23,209,12:00:00,LAHO 160K Orbit# 615 SSR_Dump/Tracking Contact 17.5re Desc

IBEX,USHI02,ADD,07/28/23,209,15:30:00,07/28/23,209,16:30:00,LAHO 160K Orbit# 615 SSR_Dump/Tracking Contact 15re Desc

This contact has been extended for 30 minutes.

IBEX,AUWA01,ADD,07/28/23,209,19:30:00,07/28/23,209,21:00:00,LAHO 160K IBEX-3 Orbit# 615 SSR_Dump/Tracking Contact 12.5re Desc

Tasks Accomplished:

SSR Dump -> Dump New

Dumped FC Back Orbit Data

CAR # 344 Reset FDC Totals and Reset Response Latch Values

CAR #1330 Orbit 616 ATS Uplink

Reset Master Timer

Results from the Inertial Maneuver:
Q1 -0.25042400 ActNor.EstInrToBdy[0]
Q2 -0.50670900 ActNor.EstInrToBdy[1]
Q3 -0.50293000 ActNor.EstInrToBdy[2]
Q4 0.65390800 ActNor.EstInrToBdy[3]

GPS sec 1373875363 ActNor.EstTime
UTC time 07/20/2023 08:02:29 output

MPS Diff 0.474 deg

MPS Cmd Vector X -0.414354000
MPS Cmd Vector Y 0.838566000
MPS Cmd Vector Z 0.353720000

CSS Angle TLM 0.414959
CSS Sun-Pointing Angle 0.829918
  15 July 23 at 04:00:00

CSS Angle TLM 0.546801
CSS Sun-Pointing Angle 1.093602
  20 July 23 at 08:00:00

Pre-Burn
Thruster 1 8016 15 July 23 at 04:00:00
Thruster 2 7840
Thruster 3 9984
Thruster 4 10160
Post-Burn
Thruster 1 8304 20 July 23 at 08:00:00
Thruster 2 8096
Thruster 3 10304
Thruster 4 10512
Number of Pulses
Thruster 1 288
Thruster 2 256
Thruster 3 320
Thruster 4 352
Thruster Pairs
Thruster 1 & 2 544
Thruster 3 & 4 672

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

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