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last update
22:15 UTC
SFI: 70 | Ap index:  2  | Kp index:  0  ( 0 @16:45,  0 @19:45)| X-ray flux:  A1.6 
SW: Density= 5.6 p/cm3 | Speed= 333.4 km/s | Temp=32(x1000)K
IMF: Bx=2.0nT | By=-5.4nT | Bz= 3.3 nT | Bt= 6.6 nT | Lat= 29.5 ° | Lon=290.6°
Sunspots: 12 | Area: 10 10-6/Hemi | New regions: 0
[i]X-ray flares: C=0 M=0 X=0 | Optical flares: M1=0 M2=0 M3=0 | Sub-flares=0
The following summarizes the activies that have taken place since the last update on September 19. On September 20, commands were sent for increasing the battery charge rate to C/4 and closing latch valves. The carrier signal was very low, intermittent, and carrier lock could not be maintained. After switching to the +Z LGA, no downlink signal was received. Commands were sent to the place the TWTA in standby and power on the propulsion tank primary heaters. No telemetry frames were received. On Friday, September 23, during the 70m track with DSS-43, the radio science team detected an extremely weak (~10 dB-Hz SNR) at 2200z for 15 seconds.

The following Tuesday, September 27, during the 2 hour support with DSS-14, no downlink carrier was detected by the DSN after individually commanding and loading the test macro to power on the TWTA. The FDF received 17 tracking points labeled as 2-way. Residuals roamed between -200 and 1054 m/s, with a few points at similar levels. Mission Operations then directed DSN to begin configuring for automated battery recovery operations (i.e. repeated multiple sweeps in a 3 kHz range). At 1455z, automated battery recovery operations commenced, with MOC repeatedly commanding the following configuration through EOT - IEM switched power and 1553 off; TWTA to standby, primary and secondary propulsion tank and -Y panel (R4) heaters on.

BEHIND observatory status: Low main bus voltage, 2 (#6 & 9) out of 11 battery cells are currently not functioning, high battery temperature, attitude uncontrolled, rotating at a ~45 second period about its principal axis of inertia. Current orientation support may support some solar array input; RF communications on the +Z LGA only supports uplink of short commands to an LGA. While propellant is suspected to be frozen, from the last telemetry received on Sep 18th, both propulsion tank latch valves are open, and pressure transducer #2 is not functioning. Power switching boards are on; nearly all switched loads off including the IEM (avionics) and PDU 1553 bus with the TWTA in standby and propulsion primary and secondary tank heaters on and -Y panel (R4) heaters on. EA mode is enabled. The battery charge rate is C/10. As the uncontrolled communications link is degrading, necessary macro sequences to allow the peak power tracker in C&DH standby mode to protect the battery will be loaded when the communications link supports.

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