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s2a systems @s2a-systems.bsky.social · 28/09/2026

A short clip of ESA's JUICE Earth flyby, recorded about 38 minutes before closest approach.

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s2a systems @s2a-systems.bsky.social · 16/09/2026

Once again USA 32 (#19460), during its second pass over South America this morning 2026-09-16, 09:23:35 – 09:34:48 UTC.

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s2a systems @s2a-systems.bsky.social · 16/09/2026

Some recordings of USA 32 (#19460), whose fragmentation in LEO on 13 Sep 2026 at approximately 2113 UTC was confirmed by U.S. Space Forces–Space (S4S). By the time of the recordings, a large number of fragments had already dispersed over a wide section of the track.

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s2a systems @s2a-systems.bsky.social · 12/09/2026

A short animation of PRC TEST SPACECRAFT 4 (#67689) and, most likely, OBJECT J (#100681) passing over South America on 2026-09-10, from 09:45:07 to 09:48:39 UTC.

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s2a systems @s2a-systems.bsky.social · 10/09/2026

Two snapshots of SPECTRUM #100614 and OBJECT E #100613, recorded on 2026-09-07 between 21:40:46 and 21:43:40 UTC.

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s2a systems @s2a-systems.bsky.social · 04/09/2026

A short animation of images recorded over 36 min of @isro’s EOS-05 (GISAT-1A) and the GSLV upper stage, from Switzerland on 2026-09-04, 19:11:36–19:47:36 UTC.

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s2a systems @s2a-systems.bsky.social · 03/09/2026

We would also like to express our sincere thanks to Tim Flohrer, Oleksandr Kozhukhov, and the entire Cluster re-entry team at ESA for giving us the opportunity to apply our optical SSA network to the Cluster re-entry campaign and gain valuable experience in this specific operational context.

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s2a systems @s2a-systems.bsky.social · 03/09/2026

We are pleased that our work could contribute to the successful completion of this extraordinary mission.

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s2a systems @s2a-systems.bsky.social · 03/09/2026

Over 35 nights, we conducted more than 200 observation series from 3 stations and recorded over 35000 astrometric positions, contributing to ESA’s orbit determination efforts for the targeted re-entries.

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s2a systems @s2a-systems.bsky.social · 03/09/2026

With the re-entry of CLUSTER II-FM8 (Tango) on 1 September, our daily tracking campaign for the final two CLUSTER satellites has come to an end.

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s2a systems @s2a-systems.bsky.social · 30/08/2026

The Nancy Grace Roman Space Telescope on its way. Recorded on 2026-08-30, 12:41:23 UTC from our Australian site. #NASARoman

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s2a systems @s2a-systems.bsky.social · 28/08/2026

A snapshot of the CZ-6C upper stage (#100472), recorded today 2026-08-28, 21:26:21 UTC from our Swiss station. The upper stage apparently fragmented according today’s post from LeoLabs: www.linkedin.com/posts/at-230...

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s2a systems @s2a-systems.bsky.social · 31/07/2026

Interesting change in the orbital data for INTELSAT 805 #25371 and visually detectable objects in the vicinity. Worth keeping a closer eye on.

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s2a systems @s2a-systems.bsky.social · 08/07/2026

Some of the Transporter-17 payloads over Switzerland, recorded on 2026-07-07, 23:17:33 UTC.

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s2a systems @s2a-systems.bsky.social · 23/06/2026

A short time-lapse of PRC TEST SPACECRAFT 4 (67689/2026-024A) and the newly deployed object (69673/2026-024H), captured on 2026-06-23 during their pass over Switzerland.

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s2a systems @s2a-systems.bsky.social · 19/06/2026

A short time-lapse of last night’s pass of the CZ-12 upper stage (69581/2026-137K) over Switzerland, recorded on 2026-06-19 from 01:55 to 02:04 UTC.

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s2a systems @s2a-systems.bsky.social · 18/06/2026

Bluebird 8-10 from launch 2026-139. Recorded on 2026-06-18, 01:50:00 UTC

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s2a systems @s2a-systems.bsky.social · 18/06/2026

8 payloads from CentiSpace-1 launch 2026-138. Recorded on 2026-06-18, 01:37:34 UTC

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s2a systems @s2a-systems.bsky.social · 18/06/2026

All 9 payloads from GuoWang launch 2026-137. Recorded on 2026-06-18, 00:43:45 UTC

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s2a systems @s2a-systems.bsky.social · 18/06/2026

The CZ-12 upper stage from launch 2026-137 (69581/2026-137K), recorded tonight, 2026-06-18 between 00:26 and 00:30 UTC during its pass over Switzerland.

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s2a systems @s2a-systems.bsky.social · 14/06/2026

After a longer period of bad weather, a short view on the ZQ-2E R/B (69537/2026-128C), recorded this morning from Australia.

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s2a systems @s2a-systems.bsky.social · 19/05/2026

Since monitoring Near-Earth Objects (NEOs) is also part of Space Situational Awareness, we didn’t want to miss this opportunity and took a quick look at 2026 JH2 during its visit yesterday. en.wikipedia.org/wiki/2026_JH2

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s2a systems @s2a-systems.bsky.social · 05/05/2026

Happy Anniversary, LAGEOS-1. Today, May 4, marks the 50th anniversary of the launch of the LAser GEOdynamic Satellite (LAGEOS) 1. A good reason to track it for a few minutes and say hello. More about the mission at: earth.gsfc.nasa.gov/geo/missions...

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s2a systems @s2a-systems.bsky.social · 27/04/2026

STARLINK G17-16 as it emerges from Earth's shadow and passes over South America on 2026-04-26 from 22:53:38 to 22:56:45 UTC.

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s2a systems @s2a-systems.bsky.social · 10/04/2026

This morning’s Artemis II: Integrity on its way back home Crossing the field of view slowly from left to right. Time-lapse covering the period from 07:30:00 to 07:59:58 UTC on 2026-04-10. Further observations from our sites will no longer be possible due to the orbit.

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s2a systems @s2a-systems.bsky.social · 09/04/2026

And for those who don't enjoy searching, here is Integrity's position at the start of the animation.

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s2a systems @s2a-systems.bsky.social · 09/04/2026

This morning’s Artemis II: Integrity on its way back home, at the edge of the Milky Way. Crossing the field of view from bottom left to top right. Time-lapse covering the period from 06:25:39 to 07:25:36 UTC on 2026-04-09. Second-to-last day of the mission.

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s2a systems @s2a-systems.bsky.social · 08/04/2026

And now for something completely different: a short time-lapse of Starlink G17-35 passing over Switzerland on 2026-04-07, from 19:17:38 to 19:18:31.

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s2a systems @s2a-systems.bsky.social · 08/04/2026

Today’s Artemis II: Integrity on its way back home. Time-lapse covering the period from 06:45:04 to 07:45:00 UTC on 2026-04-08.

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s2a systems @s2a-systems.bsky.social · 07/04/2026

Today’s Artemis II: Integrity on its way back home. Crossing the field of view from the bottom center to the top. Time-lapse covering the period from 07:00:00 to 08:00:31 UTC on 2026-04-07.

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s2a systems @s2a-systems.bsky.social · 06/04/2026

Today’s Artemis II: Integrity on its way to the Moon. Crossing the field of view from the bottom left to the top right. Time-lapse covering the period from 04:00:04 to 05:59:56 UTC on 2026-04-06.

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s2a systems @s2a-systems.bsky.social · 05/04/2026

Today’s Artemis II: Integrity on its way to the Moon. Time-lapse covering the period from 07:20:05 to 08:24:46 UTC on 2026-04-05.

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s2a systems @s2a-systems.bsky.social · 04/04/2026

Today’s Artemis II: Integrity on its way to the Moon. Time-lapse covering the period from 08:05:32 to 09:24:34 UTC on 2026-04-04.

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s2a systems @s2a-systems.bsky.social · 03/04/2026

A cropped and zoomed-in animation of yesterday's ICPS after the CubeSats were deployed. Time-lapse covering the period from 04:26:31 to 05:35:42 UTC on 2026-04-02.

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s2a systems @s2a-systems.bsky.social · 03/04/2026

Today’s Artemis II: Integrity on its way to the Moon. Time-lapse covering the period from 09:17:45 to 10:01:26 UTC on 2026-04-03.

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s2a systems @s2a-systems.bsky.social · 02/04/2026

Artemis II: Orion and ICPS at high altitude over Australia on 2026-04-02, 19:34:51 UTC

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s2a systems @s2a-systems.bsky.social · 02/04/2026

A snapshot taken at 04:22:24 UTC shows Orion and ICPS, as well as what appear to be the deployed international CubeSats

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s2a systems @s2a-systems.bsky.social · 02/04/2026

And a closer look at Artemis II Orion and ICPS. The animation spans the period from 03:16:18 to 03:27:31 UTC.

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s2a systems @s2a-systems.bsky.social · 02/04/2026

A first view on Artemis II from South America on 2026-04-02, 01:57:58 UTC

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s2a systems @s2a-systems.bsky.social · 01/04/2026

STARLINK G10-44 low elevation pass over our South American site on 2026-03-31 10:06:39 UTC at 4.5 degrees elevation.

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s2a systems @s2a-systems.bsky.social · 31/03/2026

A short clip of tumbling STARLINK-34343 (#64157), recorded from Switzerland on 2026-03-31 between 20:47:24 and 20:48:10 UTC.

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s2a systems @s2a-systems.bsky.social · 24/03/2026

And the final recording in this series: Rassvet-3 01 at dusk over South America.

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s2a systems @s2a-systems.bsky.social · 24/03/2026

And once again Rassvet-3 01, this time recorded from the Swiss station.

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s2a systems @s2a-systems.bsky.social · 24/03/2026

Snapshot of the 16 Rassvet-3 01 satellites and two additional objects from today, 2026-03-24 09:43:12 UTC

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s2a systems @s2a-systems.bsky.social · 21/03/2026

A 6.5-hour time-lapse sequence showing yesterday’s TJS-10/TJS-3 (centered) encounter, including the passage through Earth’s shadow near the equinox.

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s2a systems @s2a-systems.bsky.social · 13/03/2026

SatNet LEO Group 20 and the Long March 8A (CZ-8A) upper stage from this morning over South America. The objects surrounding the upper stage are most likely remnants of the passivation process.

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s2a systems @s2a-systems.bsky.social · 09/03/2026

A two hours light-curve from EXPRESS AT1 (Ekspress-AT1) #39612 recorded last night.

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s2a systems @s2a-systems.bsky.social · 06/03/2026

and the corresponding light curve

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s2a systems @s2a-systems.bsky.social · 06/03/2026

An unfavorable orbit and a lot of Saharan dust over Central Europe made observation difficult. Nevertheless, we were able to record about 90 minutes of today's PROBA-3 pass from Switzerland. PROBA-3 CSC shows currently a repeating rotation pattern of approximately 1150 seconds.

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