CZ-11 (41847) at 435.710MHz

CZ-11 R/B 41847 is transmitting CW at 435.710Mhz. It was launched 2016-11-09, and it surprises me that it is not yet in the db: SatNOGS DB - Search Results

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We do have this:

CZ-11 R/B is a different name of:

https://db.satnogs.org/satellite/WMGA-3000-1529-8035-2634#transmitters

There seems to be some confusion between 41847 and 41845. Can you check on your data the fit? If 41847 is a better fit then I will change it.

The 41845 is not a good fit:

Maybe these where swapped in space-track or so? I also found some confusion on twitter:

and

There has been some discussion the chat, and It has already been updated.

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Some analysis on the 41845 and 41847 OBJECTS from SatNOGS observations:

Observation 78558 at 2018-02-13 18:04:21 UTC was the last one with OBJECT E(41845) describing CAS-2T.
Observation 82434 at 2018-02-18 23:47:26 UTC is the first one with signal from CAS-2T where we see OBJECT G(41487) fit better the signal.

Bellow is how OBJECT G(41487) fits the signal of observation 82434 by using ikhnos(the results are not perfect due to different waterfall format back then):

So it seems there was a swap of OBJECTS between 2018-02-13 18:04:21 UTC and 2018-02-18 23:47:26 UTC

These are the TLE sets from spacetrack.org between these two dates:

0 LISHUI 1-01
1 41845U 16066E   18044.08327183  .00001581  00000-0  22942-3 0  9997
2 41845  98.7579  76.2724 0318757 234.9672 122.1253 14.48644607 66104
0 LISHUI 1-01
1 41845U 16066E   18044.35955704  .00001539  00000-0  22355-3 0  9994
2 41845  98.7592  76.5600 0318734 234.1377 122.9792 14.48645145 66142
0 LISHUI 1-01
1 41845U 16066E   18044.56677224 +.00001569 +00000-0 +22767-3 0  9995
2 41845 098.7597 076.7756 0318758 233.4988 123.6476 14.48646045066188
0 LISHUI 1-01
1 41845U 16066E   18044.91213053 +.00001457 +00000-0 +21218-3 0  9996
2 41845 098.7599 077.1356 0318715 232.4604 124.7221 14.48646071066233
0 LISHUI 1-01
1 41845U 16066E   18045.05027387  .00001495  00000-0  21742-3 0  9999
2 41845  98.7594  77.2794 0318797 232.0419 125.1615 14.48646862 66246
0 LISHUI 1-01
1 41845U 16066E   18045.32655918  .00001453  00000-0  21163-3 0  9997
2 41845  98.7599  77.5671 0318841 231.1996 126.0344 14.48647542 66287
0 LISHUI 1-01
1 41845U 16066E   18045.53377329 +.00001474 +00000-0 +21447-3 0  9995
2 41845 098.7600 077.7822 0318831 230.5738 126.6840 14.48648313066325
0 LISHUI 1-01
1 41845U 16066E   18045.67191615  .00001430  00000-0  20827-3 0  9995
2 41845  98.7592  77.9253 0318889 230.1454 127.1278 14.48648412 66331
0 LISHUI 1-01
1 41845U 16066E   18045.87913077 +.00001394 +00000-0 +20331-3 0  9990
2 41845 098.7589 078.1407 0318863 229.5177 127.7807 14.48648772066374
0 LISHUI 1-01
1 41845U 16066E   18046.08634554  .00001401  00000-0  20435-3 0  9998
2 41845  98.7588  78.3559 0318893 228.8918 128.4352 14.48649475 66397
0 LISHUI 1-01
1 41845U 16066E   18046.29355973  .00001385  00000-0  20203-3 0  9990
2 41845  98.7588  78.5711 0318899 228.2640 129.0878 14.48649975 66420
0 LISHUI 1-01
1 41845U 16066E   18046.43170274 +.00001401 +00000-0 +20425-3 0  9990
2 41845 098.7588 078.7147 0318895 227.8457 129.5249 14.48650508066456
0 LISHUI 1-01
1 41845U 16066E   18046.77705974  .00001402  00000-0  20433-3 0  9998
2 41845  98.7580  79.0740 0318966 226.7919 130.6228 14.48651507 66495
0 LISHUI 1-01
1 41845U 16066E   18047.12241675  .00001439  00000-0  20928-3 0  9990
2 41845  98.7576  79.4326 0319091 225.7363 131.7278 14.48652959 66541
0 LISHUI 1-01
1 41845U 16066E   18047.46777302  .00001490  00000-0  21645-3 0  9992
2 41845  98.7578  79.7926 0319014 224.7022 132.8056 14.48654357 66593
0 LISHUI 1-01
1 41845U 16066E   18047.81312978  .00001468  00000-0  21335-3 0  9996
2 41845  98.7578  80.1512 0319060 223.6528 133.9008 14.48655197 66648
0 LISHUI 1-01
1 41845U 16066E   18048.08941490  .00001495  00000-0  21689-3 0  9995
2 41845  98.7578  80.4378 0319182 222.8067 134.7870 14.48656305 66687
0 LISHUI 1-01
1 41845U 16066E   18048.50384300  .00001490  00000-0  21623-3 0  9996
2 41845  98.7576  80.8698 0319227 221.5587 136.0944 14.48657559 66743
0 LISHUI 1-01
1 41845U 16066E   18048.78012827  .00001467  00000-0  21291-3 0  9993
2 41845  98.7576  81.1563 0319253 220.7176 136.9751 14.48658244 66783
0 LISHUI 1-01
1 41845U 16066E   18049.12548438  .00001549  00000-0  22409-3 0  9997
2 41845  98.7575  81.5156 0319429 219.6639 138.0854 14.48660142 66833
0 LISHUI 1-01
1 41845U 16066E   18049.47083935  .00001589  00000-0  22963-3 0  9990
2 41845  98.7575  81.8746 0319434 218.6182 139.1787 14.48661622 66885
0 LISHUI 1-01
1 41845U 16066E   18049.81619472  .00001646  00000-0  23733-3 0  9999
2 41845  98.7574  82.2340 0319477 217.5800 140.2677 14.48663149 66934
0 CZ-11 R/B
1 41847U 16066G   18044.45543262 -.00000013 +00000-0 +95543-5 0  9997
2 41847 098.7616 070.6810 0364962 251.9799 104.1316 14.37859329066545
0 CZ-11 R/B
1 41847U 16066G   18044.66419823 +.00000015 +00000-0 +13860-4 0  9997
2 41847 098.7616 070.8943 0364966 251.3635 104.7612 14.37859565066571
0 CZ-11 R/B
1 41847U 16066G   18045.08172984  .00000052  00000-0  19323-4 0  9999
2 41847  98.7613  71.3207 0365068 250.0785 106.0803 14.37860107 66631
0 CZ-11 R/B
1 41847U 16066G   18045.29049441 +.00000035 +00000-0 +16775-4 0  9992
2 41847 098.7612 071.5340 0365074 249.4539 106.7121 14.37860041066666
0 CZ-11 R/B
1 41847U 16066G   18045.70802671 +.00000061 +00000-0 +20781-4 0  9991
2 41847 098.7614 071.9611 0365104 248.2167 107.9810 14.37860287066728
0 CZ-11 R/B
1 41847U 16066G   18046.47350375  .00000019  00000-0  14382-4 0  9998
2 41847  98.7615  72.7434 0365110 245.9251 110.3332 14.37859996 66830
0 CZ-11 R/B
1 41847U 16066G   18046.68227047 +.00000046 +00000-0 +18379-4 0  9990
2 41847 098.7615 072.9568 0365117 245.3039 110.9736 14.37860203066865
0 CZ-11 R/B
1 41847U 16066G   18047.51733723  .00000022  00000-0  14845-4 0  9994
2 41847  98.7611  73.8098 0365166 242.8249 113.5269 14.37860284 66980
0 CZ-11 R/B
1 41847U 16066G   18047.65651535 +.00000049 +00000-0 +18890-4 0  9992
2 41847 098.7614 073.9523 0365156 242.4110 113.9556 14.37860480067004
0 CZ-11 R/B
1 41847U 16066G   18048.49158379 +.00000027 +00000-0 +15440-4 0  9997
2 41847 098.7609 074.8054 0365230 239.9248 116.5246 14.37860489067120
0 CZ-11 R/B
1 41847U 16066G   18048.70035134  .00000069  00000-0  21851-4 0  9993
2 41847  98.7607  75.0186 0365244 239.3008 117.1737 14.37860850 67157
0 CZ-11 R/B
1 41847U 16066G   18049.46583127 +.00000064 +00000-0 +21097-4 0  9994
2 41847 098.7602 075.8005 0365344 237.0294 119.5292 14.37861226067265
0 CZ-11 R/B
1 41847U 16066G   18049.67459870 +.00000121 +00000-0 +29656-4 0  9997
2 41847 098.7600 076.0138 0365349 236.4015 120.1815 14.37861650067295


The elements at space-track.org show a swap between the 41845 and 41847 objects on February 12, 2018.

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:slight_smile: that is outside my estimated period. This happened because I forgot that back then we didn’t update the TLE sets of future observations automatically. Which means that probably that observation was scheduled a day or two before its start, when the TLE swap hadn’t happened.

As @EelkeVisser said NORAD ID has been changed in DB and Network for CAS-2T and we have scheduled some observations.

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The signal comes from CAS-2T which is (together with KS-1Q) strapped to the rocket booster CZ-11. We have received several good observations. For example:
https://network.satnogs.org/observations/5018010/
It shows a nice straight CW signal, and the decoded data shows “CAS2T”

Mystery solved :slight_smile:

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