Great to see a TLE with the expected altitude for Ten-Koh 2. It’ll be later this evening before we get a chance from the U.S. East Coast
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2026-03-11 19:00 ~ 19:10
no signals on my waterfall
2026-03-11 20:38 ~ 20:48 zenith pass
no signals on my waterfall
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Also no signals visible on my STRF observation
Jan | PE0SAT
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No CW signals (or GMSK up band) seen over FN41iq, Rhode Island on the beam or the helix (+/- 15 minutes of published tle).
Bob N6RFM
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Nothing heard on either of the Eastern U.S. passes tonight, unfortunately. Hopefully we’re just waiting for a low battery to get some charge on it.
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or over North Texas in the subsequent pass.
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No CW signals @ QM06 2026-03-12 09:08-.
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No reception, except this observation SatNOGS Network - Observation 13568813 which could be ten-koh 2. From a quick check not other known satellite fits this.
However, the signal is not visible in other observation at the same time, I don’t know if the interval of 60s is right for ten-koh 2 and finally I don’t know if this kind of modulation is active on ten-koh 2.
Let’s keep watching!
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NO CW/GMSK @PN27 202603121230UTC
MAX 70.4° Not hread anything，Only local Station signal
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Is this valid? https://network.satnogs.org/observations/13573234/
We have an updated TLE set for HTV-X1 which isn’t attached to ISS:
0 HTV-X1
1 66174U 25241A 26071.96616758 .00010857 00000-0 47039-3 0 9999
2 66174 51.6351 57.2626 0005807 182.7900 177.3045 15.22870559 21455
We have also a analyst object that uses the International Designator of an object deployed from HTV-X1, so I assume this is Ten-Koh 2:
0 TBA - TO BE ASSIGNED
1 88780U 25241B 26071.31019830 .00010367 00000-0 45580-3 0 9998
2 88780 51.6301 60.3795 0004576 163.6979 196.4146 15.22421637 141
The above changed to use SatNOGS DB temporary NORAD ID for Ten-Koh 2:
Ten-Koh 2
1 98542U 25241B 26071.31019830 .00010367 00000-0 45580-3 0 9995
2 98542 51.6301 60.3795 0004576 163.6979 196.4146 15.22421637 148
Both TLE sets are very close with the latest we used for Ten-Koh 2 until now, so it should be visible in observations if active.
Unfortunately none of the above TLE sets fits these two candidate observations, so I’ve vet them back to “no-signal”.
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From a quick check on this observation and a couple more at the same time, the signal you see is coming from ArcticSat-1 (61762).
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The signal from Ten-Koh2 is weaker than expected.
At our ground station, we are monitoring telemetry(voltage, temperature etc.) via the CW beacon. Reception reports via SatNOGS are very helpful. We would appreciate your continued support in receiving signals.
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Again from Twitter/X:
Currently, only the CW signal on 435.860 MHz is active. It is transmitted every 90 or 180 seconds depending on the satellite status.
Thank you very much for your cooperation!!
So, I’m going to remove the scheduled observations at 435.895 MHz and schedule a couple more observations at 435.860 MHz.
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2026-03-13 19:52 ~ 20:05 zenith pass
no signals on my waterfall
1 Like
Here is an update to that Space-Track ‘88780/25241B’ object that is assumed to be Ten-Koh 2. Note that HTV-X1 has been assigned #66174 (25241A), so it stands to reason that 25241B will ultimately be declared to be Ten-Koh 2.
1 98542U 25241B 26071.31019830 .00010367 00000-0 45580-3 0 9995
2 98542 51.6301 60.3795 0004576 163.6979 196.4146 15.22421637 148
There is currently just over a minute of time between the two objects. Fingers crossed that Ten-Koh 2 can resolve whatever issue is restricting the downlink to such low SNR
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From the satellite team, through twitter/X there is a new TLE:
1 88780U 25241B 26070.52244801 .00012246 00000+0 52908-3 0 9997
2 88780 51.6345 64.1275 0005823 176.2158 183.8864 15.22844142 23
Here is the same TLE using the DB temporary NORAD ID:
Ten-Koh 2
1 98542U 25241B 26070.52244801 .00012246 00000+0 52908-3 0 9994
2 98542 51.6345 64.1275 0005823 176.2158 183.8864 15.22844142 20
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Hm… I’ve just noticed that this seems to be older than the one in the current space-track.org catalog, so DB and Network will continue to use the more recent one:
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