Latest observation shows a great improvement of fit between the old CSpoC TLE and the new GPS-based:
2 Likes
One more TLE set by @cgbsat:
Bobcat-1
1 46922S 98067RS 22097.74834491 .00000000 00000-0 15079-2 0 00
2 46922 51.6268 279.1917 0011546 272.3191 157.3718 16.22855144 01
1 Like
Updated TLE for the last orbits of Bobcat-1 by @cgbsat:
Bobcat-1
1 46922U 22098.35000000 .00000000 00000-0 11704-2 0 00
2 46922 51.6265 275.9061 0004593 201.0320 153.0872 16.29168306 07
We are waiting for some passes above Europe to add some more points and improve the TLE above.
1 Like
Improvement from the new TLE can be seen clearly:
Doppler Measurements extracted from those observations:
751513, 751522, 751520, 753195, 752786, 748748, 754439, 753205
edit 2023-02-02: Observation IDs given here are missing the most-significant digit (5), e.g. 751513 is obs 5751513
1 Like
Here are the latest TLE by @cgbsat:
Bobcat-1
1 46922U 22098.49000000 .00000000 00000-0 20000-2 0 04
2 46922 51.6265 275.0856 0008740 285.5958 170.6662 16.31784889 07
1 Like
Slight improvement with the new TLE in the latest observations.
New Data from observations 5747771, 5747799 & 5754485.
1 Like
Bobcat-1 started again to send GPS data so from the first ones we have this TLE set generated by @cgbsat:
Bobcat-1
1 46922S 98067RS 22098.55714120 .00000000 00000-0 95229-3 0 02
2 46922 51.6271 274.7013 0007565 271.6541 219.4487 16.31475028 02
2 Likes
New TLE ‘GPS-3’ shows essentially no difference to ‘Doppler-2’ in the latest observations:
(It shows a worse fit for older observations, but it’s predictive power does not necessarily depend on those).
New Observations: 5755496, 5755438, 5756054 & 5755963
4 Likes
This is the latest TLE set from the GPS data:
Bobcat-1
1 46922S 98067RS 22098.72380787 .00000000 00000-0 11147-2 0 05
2 46922 51.6241 273.7679 0010674 268.2963 124.2720 16.36244074 04
One more! Thanks @cgbsat!
Bobcat-1
1 46922S 98067RS 22098.77589120 .00000000 00000-0 10307-2 0 09
2 46922 51.6251 273.4757 0009955 268.3058 71.4232 16.37506332 05
1 Like
BOBCAT-1 is still alive and well! , 3000+ frames in the process of uploading now from this 19:09-19:15 UTC pass
4 Likes
It was an unattended ftp download, there will be probably another one in about an 1h.
Here are the updated TLE:
Bobcat-1
1 46922S 98067RS 22098.79672454 .00000000 00000-0 97282-3 0 02
2 46922 51.6253 273.3587 0009919 267.2973 195.3428 16.37920803 07
With the latest data it will take some time for Bobcat-1 to re-enter. Let’s see if we will be lucky to catch the re-entry over any SatNOGS station.
Bobcat-1
1 46922S 98067RS 22098.85922454 .00000000 00000-0 93597-3 0 02
2 46922 51.6249 273.0079 0011008 265.1618 206.5300 16.39873762 07
Sorry for the spam but Bobcat-1 is still up there:
Bobcat-1
1 46922S 98067RS 22098.90089120 .00000000 00000-0 93930-3 0 03
2 46922 51.6247 272.7737 0010288 266.2362 91.7646 16.41554573 05
That was a great journey! Congratulation to all!
5 Likes
@zr6aic’s station was the last one that caught frames from Bobcat-1 some minutes before its re-entry:
6 Likes
Was this an artifact then? I thought I’d captured it, but it was swinging wildly in Freq.
Yes, that looks like another satellite. Thanks to the GPS-based TLEs, we were actually quite close in frequency for most of the reentry.
@ZR6AIC: I would love to send you a Bobcat-1 mission patch to thank you for catching Bobcat-1’s final transmission on your station. If you’re interested, please PM me your address so I can mail it to you.
The patch: https://twitter.com/Bobcat1_Cubesat/status/1512449021998153728/photo/2
Thank you,
Kevin & Bobcat-1 Team
2 Likes
This is a “replay” of my real-time map showing just bobcat and its last few observations.
The orbital line only shows up when its in an observation and the line color between Bobcat-1 and the station is what rating the observation had. (Only Good observations show as green, unknown show as red since the code that generated this is from 2 years ago.)
Its sort of crazy to get a look at how its falling orbit compares to what any other average satellite orbit looks like. (As seen on my realtime map)
To view this you are going to have to download the file and drag and drop it on to the screen at Cesium Viewer The part of my program for viewing and recording these is currently not working at all for some reason. I think it might have to do with changes to my CesiumJS and Mapbox API key permission I did a while ago.
You will have to rename it from .txt to .czml had to change the ending to upload it to the forums.
bobcat.txt (1.0 MB)
1 Like