I’ve added in SatNOGS DB Sedna-1, it seems to be deployed from ION deployer and according to ITU entry it should transmit at 400.575 MHz and/or 400.625 MHz. I’ve updated also the first post of the thread.
For now we are going to use ION SCV-012 TLE until we have something better, however as we don’t know the exact day of deployment it may be separated enough from it and the TLE not be accurate at all.
Thank you for posting this update on a ‘new’ object!
No downlink was observed on either of the Sedna-1 freqs but there was a possible signal 10-minutes BEFORE where it was expected based on the ION SVC-012 TLE.
I was not recording so far in advance, so unfortunately cannot help with identifying the transmission mode. I will investigate further when there is another high pass over my location. It may be worthwhile to schedule an observation or two to cover the time period ~10-min in advance of ION SVC-012 in case this does happen to actually be a downlink from Sedna-1.
For both CUAVA-2 and WaratahSeed-1 satellite, we have noticed that the downlink frequency by ~500Hz to 1kHz from the designed 400.65Mhz centre frequency. I’m currently tracking WaratahSeed-1 with 400.649Mhz and CUAVA-2 with 400.6495Mhz. With these adjustments, we were able to get much more successfully decoded data.
I’ve added in DB transmitters entry the shifted frequency for each of the satellites transmitters. Future observations will be updated accordingly in the SatNOGS Network.
Feel free to suggest such changes directly in SatNOGS DB, by logging in and hit edit button in transmitter menu in the satellite page. The suggestion will be reviewed as soon as possible.
Here is a partial (haven’t checked against all identification in space-track.org) status update after the new TBA TLE sets, it looks like that with these new TLE sets from space-track.org we have all the objects tracked, so when they are assigned we can finish the identification process.
Some notes:
With these new TLE sets we have fits for the three satellites we didn’t until now (ION-SCV12, PTD-4 and Kanyini).
Given that LUR-1 is identified in space-track.org as OBJECT AQ (60506), we may watch another satellite as LUR-1 in Network. The one we observe looks to be OBJECT AN (60504). We need more in depth analysis for finding out what’s going on
Some of the satellites haven’t been received recently, however their older observations don’t seem to fit at all with the newly published TLE sets, so they remain unchanged in the table below.
The Satnogs database links to the ITU filing for Senda-1 suggest a frequency of 400.5 MHz. Am I mis-reading the information? Or maybe there is newer information?
Also, while monitoring an ION SCV 12 pass last night, I see 2k4 ax100 frames near the end of the pass on ~400.595 Mhz. The initial part of the hex strings, 65 ea 62 c0 82 0d 70 bc , did not match reported results for Theo or Brio on that frequency. So, for me another mystery. It’s a crowded sky for sure!
Thanks for all you and the friends here are doing!
Here is another representation of the same ITU entry (Notice ID) and shows both 400.575 and 400.625.
This could be another ION deployer, I think I’ve seen a couple of signals in some observations in Network were two of them are visible.
It is amazing how this community, even with limited information in many cases, manages to track so well launches like that. And I would like to point out that it may look like one man show but it is far from this, there are many people behind this project that support it with their stations setups, help by gathering information, review/vet the observations, verify our results/findings, contribute data and code, share knowledge and much more.
Hello Fredy. I can clarify a few things wrt Sedna-1. The UHF dl is at 400.625MHz. UHF link is not yet fully commissioned as the ground stations are only now coming online. Most contacts are using S-band currently. Sedna-1 does not beacon (same with Brio and Thea or any of the SpaceQuest satellites) so it is much harder for this community to find / record it, unless you are near our GS sites. Here is the last good TLE that I have for it:
Note that the above NORAD ID is temporary and will change once it is released publicly. While close, 60580 does not look correct. Looks like this object was tracked on-orbit before the launch of transporter-11.
@mikalandzelo thanks for the info! I have some notes/questions:
As we recently introduced area-specific scheduling of observation can you share these sites, if you can not share an exact location, a wider area, like south east US or north west Europe, would be also useful.
Also it would be useful if you can share your S-band frequency in order to try to receive it too.
Given that 60580 has as International Designator value “24149xx” it should belong on Transporter 11 launch, except if I’m missing something. This also looks to follow well the TLE you shared in your message, this is why I’ve chosen it.
SpaceX has announced 116 payloads (hosted or not) on this launch, given that in this thread from NasaSpaceFlight forum there are described 3 hosted payloads, we expect 113 objects to be tracked by space-track.org which is the current number of the tracked objects right now. So, theoretically and if we don’t miss any information, Sedna-1 should be one for these 113 objects.
Ahh, I had imported the 60580 TLE incorrectly it looks like (?). On a closer inspection, I think you are correct. This does match fairly closely to the TLE I provided. I was simply going by N2YO info which listed launch date as the 16th of August, which is 2 days before T-11 launch. It may be that this info on N2YO site is wrong.
Regarding GS sites, S-band is over Svalbard, Inuvik, and Troll. Frequency is around 2200MHz; there are multiple channels that can be used. Currently, this is only exercised a couple of times a day while things are still being spun up. UHF will be on the East Coast of US, but this is not fully setup yet.
Thank you for the explanation of the designator value. I was honestly not familiar with this.
Hi Mikal,
Do you have any further information on BRIO?
On several occasions, here on the US northeast coast, I have seen telemetry on 400.595 which very closely matches the tle for BRIO. Interestingly, I see and can decode first 2k4, then 48k, then 9k6 AX100 Mode 5 packets.
For me, this is the first time I recall a satellite changing downlink speeds during the pass. Makes me wonder if this is part of the commissioning testing?
I think that they’ve just published today the deployment video, as Deimos it was one of the deployed satellites at day one and also we track it all these days. It had also gone through a reset make it to transmit to default 401.500 MHz but now it is in its expected frequency 400.300 MHz.
