s2a systems

The 11 satellites of the Geely Constellation Group 04, recorded on 2025-08-09 10:44:27 UTC.

A short sequence with Crew10 Dragon and ISS shortly before entering the Earth's shadow over South America. Recorded on 2025-08-08 from 23:10:39 to 23:12:16 UTC.

Today morning there was movement at SJ-25/SJ-21. Our automatic system shows that SJ-25 has left its previous position. The maneuver already started in daylight and bad weather currently prevents a detailed overview. We are therefore not yet able to say anything about a possible undocking.

A brief comparison of the rotation patterns of TRACERS 1 (64870 ) and TRACERS 2 (64873). 200 seconds each, recorded tonight, 2025-08-07 between 19:50:53 and 19:57:55 UTC from Switzerland.

Today’s SJ-25/SJ-21.
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The nine Huliangwang Weixing Digui satellites of yesterday’s SatNet LEO Group 07 launch. Recorded on 2025-08-05 at 10:41:13 UTC.

SUPARCO’s remote sensing satellite PRSC-S1, recorded today, 2025-08-01 08:57:24 UTC over Australia.

A little cloudy, but here they are, the 21 satellites launched yesterday with the Starlink G13-4 launch.

Two objects from today's GSLV-F16/NISAR launch. Congratulations on the successful start of the mission.

The five Guowang satellites of today's SatNet LEO Group 05 launch. Recorded from Australia, 2025-07-27 19:53:53 UTC.

Today’s SJ-25/SJ-21. Apparently no significant changes since the last update.

Seems to be another RPO: COSMOS 2589 and OBJECT C (64527).

A bit off-topic and not our usual thing, but we couldn’t resist pointing one of our scopes at 3I/ATLAS. So, here’s the comet, captured on 2025‑07‑17 between 00:04:30 and 01:28:32 UTC.

SJ-25/SJ-21 from 2025-07-15, 17:08:46 UTC. No significant changes since the last update.

SJ-25/SJ-21 from 2025-07-04, 17:33:08 UTC. No significant changes since the last update.

SJ-25/SJ-21 Update: After a day with small but relatively constant distance yesterday, the two objects came closer again today and can no longer be separated by our instrument since about 11:00 UTC.

A time-lapse of yesterday's SJ-25 / SJ-21 coverage, recorded from 08:30 to 20:53 UTC.

Update from SJ-25 and SJ-21. 2025-06-30, 19:19:01 UTC

SJ-25 and SJ-21 on 2025-06-30 at 13:06:33 UTC

Some very impressive RPO maneuvers from COSMOS 2581, COSMOS 2582 and COSMOS 2583 during the last few days.

A few images of COSMOS 2589 and the UNID that is moving away from it, which we noticed for the first time in the night from June 21 to 22.

After a long period of bad weather, here an update from SJ-25 and SJ-21, recorded on 2025-06-26 at 12:13:41 UTC.

Tonight was already booked up with other targets, but we could at least capture Transporter-14 briefly during its low elevation (7 deg ) pass at 01:49 UTC. Here the "following" of the two groups.

SJ-25 and SJ-21 on 2025-06-22, 11:24:08 UTC

SJ-25 and SJ-21 on 2025-06-14, 14:22:39 UTC

A short time-lapse of today's 11:46-hour coverage of SJ-21 and SJ-25, recorded from 08:47 to 20:33 UTC.

SJ-21 and SJ-25: visually unresolvable by our optics at 11:44:07 and with more distance again at 14:09:35 UTC

The distance decreases: SJ-21 and SJ-25 on 2025-06-13 at 08:48:58 and 11:25:47 UTC.

A short time-lapse of today's SJ-21 and SJ-25. Recoded on 2025-06-12 between 10:23:57 and 11:16:09 UTC.

SJ-25 and SJ-21 during approaching. Recorded on 2025-06-10 at 17:25:50 UTC from Australia.