SJ-25/SJ-21 from 2025-12-22 15:15:14 UTC. After another day of bad weather, we can optically separate them again since this afternoon.

Object A and B from launch 2025-306. Four objects were detected at the position of 2025-306B.

SJ-25/SJ-21 ? from today 12:53:18 UTC. After the observed possible start of a new approximation of the two satellites on December 17, the weather was bad for two days. Slightly better conditions today allowed new observations. So, a new puzzling and search campaign has started.

A bit of Starlink from this week: STARLINK G6-90 & STARLINK G6-92.

ISS and the undocked Soyuz MS-27, recorded on 2025-12-09 02:27:13 UTC over South America, during a low elevation pass (4 deg elevation). We wish for a successful mission completion and a safe return to Earth.

The 9 satellites of Guowang Group 14. Recorded today, 2025-12-07 15:27:17 UTC.

The one object catalogued so far from the ZhuQue-3 launch 2025-282, recorded on 2025-12-05 01:52:24 UTC.

Bad weather delayed the obs, but here they are: SJ-25 and SJ-21A on 2025-11-29, 13:37:43 UTC

A short animation of tonight's pass of Transporter-15 from 2025-11-29 03:25:32 UTC (horizon) to 2025-11-29 03:27:05 UTC (entry into Earth's shadow), seen from South America.

A quick snapshot of Transporter-15 with some activity. Recorded on 2025-11-29 03:26:22 UTC at 7.4 deg elevation over South America.

We took this week another look at the object we suspect to be 65589. The object still appears to be rotating, and the photometry shows a pattern comparable to the measurement taken on September 14, 2025.

And something slightly OT. C/2025 K1 (ATLAS) during a tracking pause last night. 50 frames stacked and a single frame, from a bit earlier in the evening, to visualize the three fragments a little more clearly.

A snapshot of VIASAT-3 F2 and the ATLAS 5 CENTAUR R/B from earlier this week.

Finally, observation conditions are improving. New Glenn GS2 (2025-260C) from this morning, 2025-11-17 08:08:18 UTC, with a rotation period of approximately 309 seconds.

2025-10-28: Satellite routine paused. Comet mode activated. C/2025 A6 (Lemmon), 17:15:29 – 18:03:33 UTC, recorded from Switzerland.

HTV-X1, today 2025-10-27 23:57:21 UTC over South America.

A short light curve of the object catalogued as 2025-239A. Recorded yesterday, 2025-10-24 between 17:56:54 and 18:09:59 UTC. Looks like the upper stage and not the payload.

The 28 satellites of STARLINK Group 11-5, today 2025-10-23 00:09:06 UTC over South America.

The 18 satellites of the Qianfan Jigui (G60) Group 18, today 2025-10-21 08:01:38 UTC over South America.

The five satellites of the Hulianwang Digui Group 11, recorded today, 2025-09-28 10:11:33 UTC

GEESAT Group 06, recorded today 2025-09-25, 18:41:31 from Australia.

The four WHJSW test satellites... and heavy space traffic. Recorded today, 2025-09-17 at 09:54:43 UTC from Australia.

COSMOS 2596 [GLONASS-K1], recorded today, 2025-09-14 12:41:00 UTC, accompanied by a fainter, tumbling object in train.

Two different objects for Space-Track’s #65486. The tumbling CZ-3C stage 3 (epoch 25248.71179175) and most likely the payload (epoch 25248.96195228 after the swap of the orbital data).

A lot of movement at COSMOS 2589 and OBJECT C over the last few days while they are continuing their RPO.

The light curve of GLOBALSTAR M066 #32265 shows a clear repeating pattern. This could explain the weird orbital parameters since June. Link to the orbital data on celestrak.org: celestrak.org/NORAD/elemen...

CZ-8A upper stage (2025-187K/65314) over South America, recorded this morning 2025-08-27 10:07:44 UTC. Image 90° CCW.

The 9 satellites of the SatNet LEO Group 10 and the CZ-8A upper stage.

7 objects recorded from the 2025-185 Electron launch.

And today’s SJ-25/SJ-21. …

OTV-8 this morning, 2025-08-23 10:02:21 UTC during a low-elevation pass at 5 deg elevation.

A short time-lapse of today's CZ-6A (2025-178F/65233) pass. Recorded on 2025-08-18 from 21:14:13 to 21:21:35 UTC.

The 5 satellites of the SatNet LEO Group 09 and the CZ-6A upper stage. Recorded today, 2025-08-17, from Switzerland at 19:35:04 and 21:10:38 UTC.

The 10 satellites of yesterday’s SatNet LEO Group 08 launch. Recorded on 2025-08-14 at 00:05:33 UTC.

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. ...

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.