All,

We performed a successful test of the Lo ISN season gain test sweep table tonight. The new Lo Background table is now loaded with Energy Step 3 for every step of the sweep and the instrument is back to using its normal table. The inertial maneuver was successful. The Orbit 670 ATS was successfully uplinked. The SSR Dump had a high number of errors, so the contact Auwa01 @ 07:00gmt was failed. We also failed the USHI01 contact 1 Dec @20:00gmt. We never did get a good signal from them. We started @320k downlink with a Eb/No of 2.0 –> 6.4 with it occasionally dropping down to 0.2. We tried dropping the data rate down to 160k and the Eb/No was about the same 2.4 -> 4.6. This should have gone up about 3 DB from the 320k Eb/No. We decided to drop the data rate 40k. This should have given us about a 10 DB increase in our Eb/No. It didn’t change the Eb/No levels.

These are the 2 failed contacts:

AUWA01 12/01/24,336,07:00:00,336,08:00:00 320K IBEX-3 Orbit# 669 SSR_Dump/Tracking Contact 11re Desc

USHI01 12/01/24,336,20:00:00 ,336,21:00:00 320K IBEX-3 Orbit# 669 SSR_Dump/Tracking Contact 10.5re Asc

Tasks Accomplished:

Reset FDC Totals

Reset Master Timer

SSR Dump -> Dump New

Set Static Z Rate

CAR # 1420 – IBEX Lo ISN Season Gain Test Sweep Table

CAR # 1431 – Redump Orbit 668 Blocks

CAR # 1432 – Orbit 670 ATS Upload

Results from the Inertial Maneuver:

Q1 -0.26143800 ActNor.EstInrToBdy[0]

Q2 -0.78455300 ActNor.EstInrToBdy[1]

Q3 0.56041000 ActNor.EstInrToBdy[2]

Q4 0.04537380 ActNor.EstInrToBdy[3]

GPS sec 1417071733 ActNor.EstTime

UTC time 12/01/2024 07:01:59 output

MPS Diff 0.734 deg

MPS Cmd Vector X -0.36018700

MPS Cmd Vector Y -0.85222700

MPS Cmd Vector Z -0.37944000

CSS Angle TLM 0.78793

CSS Sun-Pointing Angle 1.57586

  27 Nov 24 @19:00:00

CSS Angle TLM 1.62233

CSS Sun-Pointing Angle 3.24466

  01 Dec 24 @07:00:00

Pre-Burn

Thruster 1 9808 27 Nov 24 @19:00:00

Thruster 2 9552

Thruster 3 11984

Thruster 4 12240

Post-Burn

Thruster 1 10064 01 Dec 24 @07:00:00

Thruster 2 9808

Thruster 3 12272

Thruster 4 12528

Number of Pulses

Thruster 1 256

Thruster 2 256

Thruster 3 288

Thruster 4 288

Thruster Pairs 

Thruster 1 & 2 512

Thruster 3 & 4 576

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

IBEX MOC (703)404-7470

Cell (301) 606-1430