PHASMA-DIRAC:
We continued gathering telemetry, everything looks good.
During the morning pass, we changed the UHF downlink of the satellite to MSK for getting better communication.
Next steps, we continue getting more telemetry data in the next passes and verify that the change to MSK works as it should.
TLE have been updated following object 88126 from space-track.org analyst catalog, still seems the one that fits best.
PHASMA-LAMARR:
On Saturday and Sunday pass, we didn’t have any good passes. We still got in S-band signals and with the changed interval (35s instead the initial 1min), Yesterday we took the decision to move the S-band signal from 400k data rate to 50k. The change wasn’t saved in order to get also the information if the satellite reboots or not. The command was sent and acknowledged through UHF and we’ve seen immediately the change in S-band.
The signals in S-band are now at 50k and with better SNR. Unfortunately the IQ we got from the yesterday’s high elevation pass had some issues, it shows the signals with good SNR but they are chopped.
The cause could be either in satellite side or in the station side, the most possible scenarios some lost samples due to network issues or some sdr overflows. Fortunately on both today’s passes the S-band signals were intact and specifically on the second pass we got very good SNR and some responds. We are now in the process of uploading the IQ file and analyze it. Also we verified that the satellite hasn’t reboot.
On the other hand, on UHF it seems that there is an issue but difficult to say what’s exactly going on, as we need more telemetry data.
Next steps, there are some thoughts for actions but we are going to play it safe and wait to decode some more telemetry to get a better understanding what’s going on and then take decisions.
TLE have been updated following object 88118 from space-track.org analyst catalog, still the object fits best.
Ground Segment:
Both phasma stations looks good in condition. Calibration of hsgr station looks good and the bypass of relays works perfectly.
In SatNOGS side we continue to get good observations and use them to produce new TLE or compare the different TLE from space-track.org analyst list.
The last days it seems that the object 66673 follows a strange path. I’m currently checking what’s going on. after completing it I’ll post a detailed analysis, until then and temporarily I’m going to change PHASMA-LAMARR entry in DB to follow object 66669.
We have verified that PHASMA-LAMARR is not 66673 object any more through the latest observation on which we received it by following 66669 when 66673 wasn’t on the field of view for at least 3-4min. We are performing further analysis to try and locate the new object we should follow.
On the latest TLE sets from space-track.org, 66673 seems to have returned to the expected/right position and fits very good that latest PHASMA-LAMARR observations.
It looks like that this was something temporary, maybe a miscalculation in some objects on space-track side and things are back to normal.
I’m going for now to change back following 66673 for PHASMA-LAMARR, however I’ll keep an eye on it. If 66673 stays consistent I’m going to proceed and finalize the identification in the next days.
Object 66673 stays consistent and giving us a lot of good PHASMA-LAMARR observations on both UHF and S-band. However, based on some other cases similar to what happened to PHASMA-LAMARR, I’m going to wait for 4-5 days before finalizing the identification, just to be sure that nothing else will change dramatically.
@tammojan and I just observed PHASMA-LAMARR with the Dwingeloo telescope on UHF (vertical and horizontal polarization) and we think we have good detections.