PA0DLO

A Free Ride to Space. Something for AMSAT organisations?

orbitaltoday.com/2025/10/06/a...

#amsat

Doppler measurements show that RSP 03 is object 65732 (1998-067XL).

Frequency: 437.050 MHz.

(Probably STARS-Me 2 is object 65731 (1998-067XK).
Frequency: 437.350 MHz. TBC.)

@tskelso.bsky.social @planet4589.bsky.social

Unsettling: China tracking satellites not tracked by the US? A crack in the foundation of rules-based order

spacedomain.substack.com/p/unsettling...

@tskelso.bsky.social @planet4589.bsky.social

Mexico's picosats ThumbSat 1 and 2 were part of the 2025-180 launch. They were never cataloged by 18SDS. I monitored their downlink frequencies in the first couple of weeks after their launch, but never received any signals from them.

(See next post)

@tskelso.bsky.social @planet4589.bsky.social

It would be nice if NASA would again include the solar array currents in the telemetry stream...

The other satellites in the 2025-155 launch, obj 64882 - 64889, transmit wide LoRa signals.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that Geoscan 4 (RS92S4) is object 64892 (2025-155S).

Frequency: 435.339 MHz.

Doppler measurements show that Geoscan 5 (RS92S5) is object 64891 (2025-155R).

Frequency: 436.663 MHz.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that InnoSat 16 (RS92S7) is object 64878 (2025-155C).

Frequency: 435.827MHz.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that Geoscan 6 (RS92S6) is object 64879 (2025-155D).

Frequency: 436.939 MHz.

Doppler measurements show that InnoSat 3 (RS92S0) is object 64894 (2025-155U).

Frequency: 436.437MHz.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that Geoscan 2 (RS92S2) is object 64890 (2025-155Q).

Frequency: 436.163 MHz.

Doppler measurements show that Geoscan 3 (RS92S3) is object 64893 (2025-155T).

Frequency: 435.741 MHz.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that 239Alfërov (RS61S) is object 64881 (2025-155F).

Frequency: 436.272 MHz.

Doppler measurements show that Geoscan 1 (RS92S1) is object 64880 (2025-155E).

Frequency: 435.971 MHz.

@tskelso.bsky.social @planet4589.bsky.social

Currently none of the AST BlueBird satellites transmit in the 430 - 440 MHz band anymore.

@amsat-dl.org #AMSAT

Tianzhou 9 (obj 64786) was in a 397 km, 41.5 deg orbit on 2025-07-16. Since 2025-07-17 it is in a 671 km, 98.8 deg orbit...

Some cross-tagging at Space-Track.org?

Doppler measurements show that two of the Hubble satellites are objects 64584 (2025-135BJ) and 64590 (2025-135BQ).

Frequency: 402.791 MHz.

@tskelso.bsky.social @planet4589.bsky.social

New doppler measurements now show that ConnectaIoT 10 is object 64555 (2025-135AD).

Frequency: 401.520 MHz.
Confusion was caused by BRO 18, object 64550 (2025-135Y), which transmits on this same frequency.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that ConnectaIoT 9 is object 64534 (2025-135G).

Frequency: 401.510 MHz.

Doppler measurements show that one of the Hubble satellites is object 64561 (2025-135AK).

Frequency: 402.790 MHz.

@tskelso.bsky.social @planet4589.bsky.social

It looks like it is probably Nahid 2.
defapress.ir/en/news/8628...

There is also an Iranian satellite on this launch, but it is not yet clear which one. Iranian sources indicate that several satellites are 'ready for launch', e.g. Payam 2, Nahid 2, Zafar 2, Tolou 3 and Saman 1.

Doppler measurements show that ConnectaIoT 11 is object 64557 (2025-135AF).

Frequency: 401.530 MHz.

Doppler measurements show that ConnectaIoT 12 is object 64553 (2025-135AB).

Frequency: 401.540 MHz.

@tskelso.bsky.social @planet4589.bsky.social

Two of the cubesats have completed IARU frequency coordination:
239-PTS/RS61S (aka 239Alferov)
iaru.amsat-uk.org/finished_det...

Lobachevsky/RS83S (aka INNOSAT16)
iaru.amsat-uk.org/finished_det...

On 2025-07-25 the launch of a Soyuz-2-1B/Fregat-M is planned at 05:54 UTC from Vostochniy 1S with Ionosfera-M №3 and Ionosfera-M №4, and 18 microsatellites and nanosatellites.

There will be 9 Geoscan satellites on this launch: Geoscan 1 through 6, 239Alferov, INNOSAT3 and INNOSAT16.

Doppler measurements confirm that SATORO-T3 is object 64589 (2025-135BP).

Frequency: 401.970 MHz.

@tskelso.bsky.social @planet4589.bsky.social

Doppler measurements show that ConnectaIoT 10 is object 64550 (2025-135Y).

Frequency: 401.520 MHz.

Doppler measurements show that PADRE is object 64559 (2025-135AH).

Frequency: 401.357 MHz.

@tskelso.bsky.social @planet4589.bsky.social

If you have two satellites in different (elliptical) orbits, how would you define the "distance along the orbit (i.e. orbital path to travel)"? Which orbit? Which orbital path? And what would you use that 'distance' for?

Doesn't matter. You can determine the satellite position vector at any chosen time. If you do that for both satellites at exactly the same time, you can calculate the direct distance at that time.

In that case you can use Skyfield to determine the length of the vector between the 2 satellite's position vectors. This is only a few lines of code in Skyfield.

Of course that is Progress-MS 29. At 18:53:10 UTC the ISS attitude control switched from Russian thrusters back to the US CMGs for the maneuver to return the ISS to its normal orientation.

Progress-M 29 undocked from the ISS at 18:43:35 UTC today,
while the station pitched down 90 degrees and its roll and yaw were also adapted.

And at repress passing 50 mbar at about 18:49:50 UTC.

@planet4589.bsky.social

ISS EVA-93: the 50 mbar, i.e. 37.50 mm Hg, level was reached at 12:56:33 UTC, marking the beginning of the EVA.

@planet4589.bsky.social