s2a systems
@s2a-systems.bsky.social
Developing and operating systems for Space Situational Awareness.
The bright object at 06:14:15 is just a bright star in the background. There was no interaction with the satellite.
January 31, 2026 at 10:37 AM
The bright object at 06:14:15 is just a bright star in the background. There was no interaction with the satellite.
and the corresponding light curve
January 30, 2026 at 11:14 AM
and the corresponding light curve
A short time lapse of the fragmentation event on LUCH (OLYMP) #40258 that took place today, 2026-01-30 from 06:09:03.486 UTC.
January 30, 2026 at 11:14 AM
A short time lapse of the fragmentation event on LUCH (OLYMP) #40258 that took place today, 2026-01-30 from 06:09:03.486 UTC.
LUCH (Olymp) has started to tumble in its graveyard orbit tonight. Additional objects around the satellite can also be visually detected. An analysis of our photometric data is currently in progress.
January 30, 2026 at 9:05 AM
LUCH (Olymp) has started to tumble in its graveyard orbit tonight. Additional objects around the satellite can also be visually detected. An analysis of our photometric data is currently in progress.
A short time-lapse sequence of today's SJ-29A (#67302) and SJ-29B (#67403).
January 30, 2026 at 12:08 AM
A short time-lapse sequence of today's SJ-29A (#67302) and SJ-29B (#67403).
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.
December 22, 2025 at 3:24 PM
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.
December 21, 2025 at 3:29 AM
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.
December 20, 2025 at 3:51 PM
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.
December 12, 2025 at 9:12 AM
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.
December 9, 2025 at 2:44 AM
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.
December 7, 2025 at 4:50 PM
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.
December 5, 2025 at 10:29 AM
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
November 29, 2025 at 2:20 PM
Bad weather delayed the obs, but here they are: SJ-25 and SJ-21A on 2025-11-29, 13:37:43 UTC
I don't have the mission details at hand. But maybe @planet4589.bsky.social has a better insight here.
November 29, 2025 at 1:49 PM
I don't have the mission details at hand. But maybe @planet4589.bsky.social has a better insight here.
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.
November 29, 2025 at 11:02 AM
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.
November 29, 2025 at 4:06 AM
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.
November 20, 2025 at 5:31 PM
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.
November 19, 2025 at 3:07 PM
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.
November 19, 2025 at 1:57 PM
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.
November 17, 2025 at 12:40 PM
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.
November 2, 2025 at 1:48 PM
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.
October 28, 2025 at 12:29 AM
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.
October 25, 2025 at 9:52 PM
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.
October 23, 2025 at 7:39 PM
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.
October 21, 2025 at 2:43 PM
The 18 satellites of the Qianfan Jigui (G60) Group 18, today 2025-10-21 08:01:38 UTC over South America.