s2a systems
@s2a-systems.bsky.social
Developing and operating systems for Space Situational Awareness.
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
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.
The five satellites of the Hulianwang Digui Group 11, recorded today, 2025-09-28 10:11:33 UTC
September 28, 2025 at 1:34 PM
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.
September 25, 2025 at 11:21 PM
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.
September 17, 2025 at 6:22 PM
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.
September 14, 2025 at 2:13 PM
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).
September 6, 2025 at 11:24 PM
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.
September 3, 2025 at 9:31 PM
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...
August 28, 2025 at 12:49 PM
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.
August 27, 2025 at 10:00 PM
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.
August 26, 2025 at 2:53 PM
The 9 satellites of the SatNet LEO Group 10 and the CZ-8A upper stage.
7 objects recorded from the 2025-185 Electron launch.
August 24, 2025 at 11:38 PM
7 objects recorded from the 2025-185 Electron launch.
And today’s SJ-25/SJ-21.
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August 23, 2025 at 6:34 PM
And today’s SJ-25/SJ-21.
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OTV-8 this morning, 2025-08-23 10:02:21 UTC during a low-elevation pass at 5 deg elevation.
August 23, 2025 at 6:19 PM
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.
August 18, 2025 at 10:15 PM
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.