Observation 7472815: BDSAT-2 (55098)

Satellites & Observations Observations
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Regarding Observation 7472815 …
Starting from yesterday morning passes, new TLE are bad for BDSAT-2, older TLE works ok, we tested it against doppler on the sat. Therefore ALL observations in Satnogs from yesterday and today are offseted in time, doppler correction does not work and minimum frames are decoded.

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Nice finding @ok2pnq!

I can confirm with ikhnos that indeed the previous TLE is much better fit than the current TLE:

Previous TLE with epoch 23115.14254172

2023-04-28T07:55:04_7472815_55098_23001CT_0-OBJECT-CT_3.1873656874074072_B_r29.0_f0.0
2023-04-28T07:55:04_7472815_55098_23001CT_0-OBJECT-CT_3.1873656874074072_B_r29.0_f0.0823×1603 409 KB

Current TLE with epoch 23116.13168551

2023-04-28T07:55:04_7472815_55098_23001CT_0-OBJECT-CT_2.1982218974074073_B_r29.0_f0.0
2023-04-28T07:55:04_7472815_55098_23001CT_0-OBJECT-CT_2.1982218974074073_B_r29.0_f0.0823×1603 407 KB

I’m going to propagate and use the previous TLE for now in DB and Network.

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Here is the propagated TLE based on space-track.org one with epoch 23115.14254172 :

0 OBJECT CT
1 55098U 23001CT  23116.20000000  .00000000  00000-0  00000-0 0    01
2 55098  97.4891 176.8055 0021865 191.0610 180.2071 15.16974174    03
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Using the space track TLE I get following error:

image
image809×615 168 KB

When using these TLE:

0 OBJECT CT
1 55098U 23001CT  23115.14254172  .00017586  00000-0  89023-3 0  9993
2 55098  97.4891 175.7608 0017133 185.3927 174.7124 15.16940157 17048

I get the following result:

image
image793×619 124 KB

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For more updates and new TLE sets we are going to use this thread:

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