CSS Deployment - CAMSAT XW-4 (CAS-10) - 2022-12-18 01:30 UTC

From Email by Alan, BA1DU

The CAMSAT XW-4 (CAS-10) satellite was launched into the Chinese Space Station on November 12, 2022 aboard China’s Tianzhou-5 cargo spacecraft, and was launched by the Long March-7 Y6 launch vehicle from the Wenchang Launch Center in Hainan, China. It is currently planned that the XW-4 (CAS-10) satellite will be separated from the Chinese space station and enter operational orbit at 01:30 UTC on December 18, 2022.

Preliminary TLE:

XW-4 (CAS-10)
1 48274U 21035A   22349.57666509  .00020514  00000+0  25201-3 0  9994
2 48274  41.4739 194.5783 0004074 111.0935 347.0781 15.59787538 93120

CAMSAT XW-4 (CAS-10) Amateur Radio Satellite User’s Manual V1.0.pdf (1.4 MB)

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We have already an entry for it:

https://db.satnogs.org/satellite/TLZR-1993-2564-0036-4315

with the temporary NORAD ID 99291

It will be available for scheduling a couple of hours before deployment.

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This is the current TLE set of CSS we have added in DB. I’ve also scheduled all the observations for the first 4 hours after deployment (01:30 UTC) and several others for the first 18h after deployment.

0 CSS (TIANHE-1)
1 48274U 21035A   22350.93058987 -.00118577  00000-0 -14660-2 0  9997
2 48274  41.4721 186.3547 0003604 131.7420  18.6096 15.59570497 93331

We will continue to follow CSS for this satellite until the deployment time, just in case we have newer TLE set published, after the deployment time we will stop following it.

EDIT: link to scheduled observations: SatNOGS Network - Observations

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This is the latest TLE set of CSS that we are going to follow for XW-4:

0 CSS (TIANHE-1)
1 48274U 21035A   22351.74770696  .00050108  00000-0  61226-3 0  9999
2 48274  41.4745 181.3915 0003876 156.8334 267.1436 15.59581000 93469

We have several receptions of XW-4, the first one was by station “123 - BG8DIV” of @BG8DIV, followed by stations “2823 - BX6AP station 2” of BX6AP N6XL, " 2152 - Tokorozawa VUHF-Discone ’ of Takehiko SONODA, " 2876 - tokyo_v-dipole" of @forestwaterfall and " 2107 - JH4XSY-pi " of @JH4XSY

Satellite is active on both 435.725 MHz and 435.525 MHz, good observations are available at SatNOGS Network - Observations.

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There are also reports that Transponder is also alive, like this one:

https://twitter.com/ba1pk/status/1604294598548824064

This is the same TLE set from earlier post adjusted to the temporary NORAD ID we use for XW-4:

XW-4 (CAS-10)
1 99291U 21035A   22351.74770696  .00050108  00000-0  61226-3 0  9994
2 99291  41.4745 181.3915 0003876 156.8334 267.1436 15.59581000 93464
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An updated TLE set for XW-4 based on latest SatNOGS observations:

XW-4 (CAS-10)
1 99291U          22351.74770697  .00000000  00000-0  61226-3 0    03
2 99291  41.4745 181.2361 0003876 156.8334 268.2917 15.59581000    02

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An updated TLE set for XW-4 based again on SatNOGS observations 6893570 and 6893421 and the previous generated TLE set:

XW-4(CAS-10)
1 99291U          22351.75000000  .00000000  00000-0  61226-3 0    08
2 99291  41.4745 180.6809 0003876 156.8334 282.2797 15.59581000    04

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One more TLE set:

XW-4(CAS-10)
1 99291U          22352.60000000  .00000000  00000-0  00000-0 0    03
2 99291  41.4745 181.2539 0003669 155.5570  18.3590 15.59666868    04

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Latest TLE set:

XW-4(CAS-10)
1 99291U          22353.20000000  .00000000  00000-0  00000-0 0    00
2 99291  41.4745 171.9916 0004792 172.5453 141.6127 15.59667949    03

Newer TLE set:

XW-4(CAS-10)
1 99291U          22353.50000000  .00000000  00000-0  00000-0 0    03
2 99291  41.4745 171.0410 0004757 172.9278  27.7699 15.59667870    04

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Latest TLE set:

XW-4(CAS-10)
1 99291U          22353.80000000  .00000000  00000-0  00000-0 0    06
2 99291  41.4745 167.7355 0003948 184.9790 264.2490 15.59667936    07

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One more update:

XW-4(CAS-10)
1 99291U          22354.50000000  .00000000  00000-0  00000-0 0    04
2 99291  41.4745 163.1179 0001224 192.7034 235.5035 15.59666681    06

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I’m still experimenting, this is why I produce several updated TLE sets, here is the latest:

XW-4(CAS-10)
1 99291U          22354.60000000  .00000000  00000-0 -20670-5 0    06
2 99291  41.4745 163.9421 0001224 131.7215 138.4218 15.60827187    04

With help from @cgbsat I have more variables fitted this time, which probably give better orbital data:

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With another curve added @fredy and improved the TLE to this:

XW-4(CAS-10)
1 99291U          22354.67000000  .00000000  00000-0  83397-3 0    05
2 99291  41.4745 163.5527 0001000   0.0000 304.1178 15.60977165    08
# 20221218.75-20221220.67, 182 measurements, 0.034 kHz rms

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Here is the TLE set from space-track.org:

0 TBA - TO BE ASSIGNED
1 54816U 21035C   22354.23186343  .00073022  00000-0  84279-3 0  9998
2 54816  41.4771 166.2840 0007544 202.1888 156.4993 15.60915548   209

Still in TBA status but given that is the only deployment from CSS it should be the right object. Anyway we will wait for the object assignment before we move to identification, until then we are going to follow this object for CAS-10.

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As the TLE set is now assigned, we have the identification of XW-4(CAS-10) as 54816.

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Not very detailed but it shows XW-4(CAS-10), also known as “Macau Student Science Popularization Satellite No. 1”, deployed from CSS:

https://twitter.com/SegerYu/status/1605133393658011649