Isro plsv-c56 - 2023-07-30 01:01 utc

Satellites & Observations Launches
21

With still having only 7 TLE sets by space-track.org (we expect more), here is the current status update:

Temporary NORAD ID Satellite NORAD ID to follow Other NORAD IDs Identified Deployed Last Update
RECEIVED AND DEMODULATED
99055 GALASSIA-2 57486 - NO YES Removed possible 57487. Waiting for the missing objects to verify identification
99056 VELOX-AM 57482 - NO YES Waiting for the missing objects to verify identification
99059 NuLIoN 57487 - NO YES Changed to follow 57487 and removed all the other possible (57481, 57484, 57486, 57487). Waiting for the missing objects to verify identification
RECEIVED
-
NOT RECEIVED
99058 ARCADE 57485 all NO YES There is one observation with signal that probably is the satellite, we need more to verify it
99057 SCOOB-II 57481 all NO YES There is one observation with signal that probably is the satellite, we need more to verify it
NOT IN DB
- ORB-12 STRIDER - - NO YES
22

Hello, thanks for all the help so far!

Would it be possible to try and track Orbstrider with 57483? Fc is 2260MHz.

23

@zning-nuspace welcome!

I’ve added the satellite with the temporary NORAD ID 99053 and set it to follow object 57483.

I’ve also added the S-band transmitter.

Feel free to check the entry and login and suggest any changes for either the satellite or the transmitter.

Unfortunately we don’t have any S-band station to cover this orbit, so it will be impossible to track the satellite. Please if you have any updates for the mission let us know.

2 Likes
24

It looks like that the TLE set for NuLIoN is 5 days old, so I’ve generated one from the latest observations by 2937 - WH6GVF UHF station.

NuLIoN
1 57487U          23218.60000000  .00000000  00000-0  00000-0 0    06
2 57487   5.0049 219.9887 0004716 278.8930   1.2120 15.10428893    07

Screenshot from 2023-08-06 17-07-46
Screenshot from 2023-08-06 17-07-462560×1440 57.7 KB

nulion_218.dat (3.2 KB)
sites.txt (2.9 KB)

25

While the rest of the objects have got updated TLE sets from space-track.org the last two days, the one we follow for NuLIoN hasn’t got an update for 5 days.

So, here is a new TLE set for NuLIoN based on observations of 2394 - YC7OIZ station:

NuLIoN
1 57487U          23221.16000000  .00000000  00000-0  00000-0 0    01
2 57487   5.0049 199.7980 0004716 289.9718 271.3318 15.10571529    07

image
image2560×1440 54.4 KB

nulion_221.dat (3.2 KB)
sites.txt (3.0 KB)

3 Likes
26

Thanks for generating the TLE Fredy! It is a little strange that Space-Track have not been generating TLE for NuLIoN. Have you all experienced this before? Separately, I have contacted them about it.

27

We have seen delays before, no idea about the reason. My guess is too much workload and in this case probably the orbit makes things difficult. I base the latter on the fact that usually satellites get 1 or 2 TLE sets per day and for this launch we see 1 TLE set per two days.

1 Like
28

One more TLE set for NuLIoN:

NuLIoN
1 57487U          23222.80000000  .00000000  00000-0  00000-0 0    03
2 57487   5.0049 189.4672 0004716 155.2752 347.4930 15.10742177    08

image
image2560×1440 59 KB

nulion_222.dat (3.7 KB)
sites.txt (3.0 KB)

1 Like
29

Hello! With 57481 being identified as DS-SAR, could we try tracking SCOOB-II with 57484? Thank you!

1 Like
30

https://network.satnogs.org/observations/8005072/

Hello! Can I check with you all, there were blips seen on this observation for Arcade. Could this possibly be Arcade but with a poor TLE?

31

Unfortunately is not ARCADE but SIREN

2 Likes
32

Here is the current status update:

Temporary NORAD ID Satellite NORAD ID to follow Other NORAD IDs Identified Deployed Last Update
RECEIVED AND DEMODULATED
GALASSIA-2 57486 - YES YES Identified as 57487, here are the ikhnos results
VELOX-AM 57482 - YES YES Identified as 57487, here are the ikhnos results
NuLIoN 57487 - YES YES Identified as 57487, here are the ikhnos results
RECEIVED
-
NOT RECEIVED
99058 ARCADE 57485 all non-identified NO YES No update
99057 SCOOB-II 57484 all non-identified NO YES No update
99053 ORB-12 STRIDER 57483 all non-identified NO YES No update
3 Likes
33

Hello SatNOGS community,
Hope you all are doing well.
Space track seems to have stopped generating new TLEs for NuLIoN, the latest one is almost 3 weeks old. We are still somewhat able to track it but the link quality has degraded to the point where we are only receiving a couple of packets. Would it be possible to seek some assistance in generating a new TLE from the community?

34

I’ve scheduled a couple of observations, as we get some data in the waterfalls will help us generate TLE set(s).

1 Like
35

Thanks fredy!

36

A new TLE set for NuLIoN:

NuLIoN
1 57487U          23265.33300000  .00000000  00000-0  00000-0 0    01
2 57487   5.0086 228.6626 0000513  82.8246 280.0542 15.12310208    07

The space-track.org one is 20 days old.

image
image2560×1440 79.1 KB

nulion_265.dat (6.1 KB)
sites.txt (3.0 KB)

3 Likes
37

Hi Fredy, Thanks for generating the new TLE, it has worked well for us. Would like to ask how did you manage to also manage to update the epoch time of the TLE?

38

iirc like this:
propagate -c file.tle -i NORAD -t DATETIME
Also @PE0SAT @pe2bz @michal.drzal can perhaps chime in on the exact process involved.

1 Like
39

Exactly! We use the propagate tool from sattools by @cgbsat.

Just in case that is not clear, the process is to fit the existing TLE to the observations data, then propagate the fitted TLE to an epoch near to the data epoch and then re-fit them and generate the final TLE.

2 Likes
40

Thanks for the explanation of the process! We tried it and noticed that when we used propagate, the eccentricity field became 0.

To be sure of the steps:

  1. We use the existing observations data and use satnogs-waterfall-tabulation-helper.py with rffit to fit the observed data into the TLE.
  2. With the generated TLE from step 1, we use propagate and for -t field, we use a close by time of the observation that we had on satnogs. For eg: SatNOGS Network - Observation 8239908, we use 2023-09-29 03:17:05.
  3. With the new TLE generated in step 2, we run rffit again to fit the observation into the TLE. We use the new TLE by replacing the TLE found inside $SATNOGS_TLE_DIR.

Following the above steps, we can generate TLE with updated epoch however, the eccentricity value would be 0. Is this method correct?