s2a systems
@s2a-systems.bsky.social
📤 124
📥 17
📝 218
Developing and operating systems for Space Situational Awareness.
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.
about 15 hours ago
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Object A and B from launch 2025-306. Four objects were detected at the position of 2025-306B.
2 days ago
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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.
3 days ago
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A bit of Starlink from this week: STARLINK G6-90 & STARLINK G6-92.
11 days ago
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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.
14 days ago
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The 9 satellites of Guowang Group 14. Recorded today, 2025-12-07 15:27:17 UTC.
16 days ago
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The one object catalogued so far from the ZhuQue-3 launch 2025-282, recorded on 2025-12-05 01:52:24 UTC.
18 days ago
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Bad weather delayed the obs, but here they are: SJ-25 and SJ-21A on 2025-11-29, 13:37:43 UTC
24 days ago
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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.
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24 days ago
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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.
24 days ago
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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.
about 1 month ago
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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.
about 1 month ago
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A snapshot of VIASAT-3 F2 and the ATLAS 5 CENTAUR R/B from earlier this week.
about 1 month ago
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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.
about 1 month ago
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2025-10-28: Satellite routine paused. Comet mode activated. C/2025 A6 (Lemmon), 17:15:29 – 18:03:33 UTC, recorded from Switzerland.
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about 2 months ago
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HTV-X1, today 2025-10-27 23:57:21 UTC over South America.
about 2 months ago
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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.
about 2 months ago
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The 28 satellites of STARLINK Group 11-5, today 2025-10-23 00:09:06 UTC over South America.
2 months ago
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The 18 satellites of the Qianfan Jigui (G60) Group 18, today 2025-10-21 08:01:38 UTC over South America.
2 months ago
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The five satellites of the Hulianwang Digui Group 11, recorded today, 2025-09-28 10:11:33 UTC
3 months ago
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GEESAT Group 06, recorded today 2025-09-25, 18:41:31 from Australia.
3 months ago
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The four WHJSW test satellites... and heavy space traffic. Recorded today, 2025-09-17 at 09:54:43 UTC from Australia.
3 months ago
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COSMOS 2596 [GLONASS-K1], recorded today, 2025-09-14 12:41:00 UTC, accompanied by a fainter, tumbling object in train.
3 months ago
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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).
4 months ago
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A lot of movement at COSMOS 2589 and OBJECT C over the last few days while they are continuing their RPO.
4 months ago
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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...
4 months ago
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CZ-8A upper stage (2025-187K/65314) over South America, recorded this morning 2025-08-27 10:07:44 UTC. Image 90° CCW.
4 months ago
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The 9 satellites of the SatNet LEO Group 10 and the CZ-8A upper stage.
4 months ago
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7 objects recorded from the 2025-185 Electron launch.
4 months ago
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And today’s SJ-25/SJ-21. …
4 months ago
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OTV-8 this morning, 2025-08-23 10:02:21 UTC during a low-elevation pass at 5 deg elevation.
4 months ago
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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.
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4 months ago
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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.
4 months ago
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The 10 satellites of yesterday’s SatNet LEO Group 08 launch. Recorded on 2025-08-14 at 00:05:33 UTC.
4 months ago
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The 11 satellites of the Geely Constellation Group 04, recorded on 2025-08-09 10:44:27 UTC.
5 months ago
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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.
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5 months ago
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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.
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5 months ago
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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.
5 months ago
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Today’s SJ-25/SJ-21. ...
5 months ago
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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.
5 months ago
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SUPARCO’s remote sensing satellite PRSC-S1, recorded today, 2025-08-01 08:57:24 UTC over Australia.
5 months ago
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A little cloudy, but here they are, the 21 satellites launched yesterday with the Starlink G13-4 launch.
5 months ago
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Two objects from today's GSLV-F16/NISAR launch. Congratulations on the successful start of the mission.
5 months ago
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The five Guowang satellites of today's SatNet LEO Group 05 launch. Recorded from Australia, 2025-07-27 19:53:53 UTC.
5 months ago
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Today’s SJ-25/SJ-21. Apparently no significant changes since the last update.
5 months ago
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Seems to be another RPO: COSMOS 2589 and OBJECT C (64527).
5 months ago
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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.
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5 months ago
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SJ-25/SJ-21 from 2025-07-15, 17:08:46 UTC. No significant changes since the last update.
5 months ago
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SJ-25/SJ-21 from 2025-07-04, 17:33:08 UTC. No significant changes since the last update.
6 months ago
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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.
6 months ago
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