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SEMI-1L

In orbit NORAD 66294 AHQE-6883-5904-8979-4877

Observations 0
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Falcon 9 Block 5 | Bandwagon 4 (Dedicated Mid-Inclination Rideshare)

Falcon 9 Block 5

Carrier rocket

Space Launch Complex 40

Spaceport

0

Observations all time

Mission information
Spacecraft name
SEMI-1L
Status
Active
The satellite is in orbit
The network has not received data from this satellite for a long time
Launch and timeline
Launch
Falcon 9 Block 5 | Bandwagon 4 (Dedicated Mid-Inclination Rideshare)
Carrier rocket
Falcon 9 Block 5
Spaceport
Space Launch Complex 40
Launch time
Separation time
Satellite appearance
Data for the last 30 days
Orbital parameters of the satellite
Perigee
499.25 km
Apogee
503.46 km
Inclination
45.4°
Period
94.6 min
Semi-major axis
6879.5 km
Velocity
7.62 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-10-10 04:46:20 UTC
Two-line elements (TLE)
1 66294U 25248B   26282.55540515  .00004578  00000-0  20921-3 0  9999
2 66294  45.4043 227.2740 0003059 338.8087  21.2673 15.21995754 51934
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Orbit history, past year

Mean elements of every TLE set over the past 365 days, plotted against the epoch of the set. Each source is its own line; click it in the legend to hide it. A jump in altitude is a manoeuvre or a bad set; lines drifting apart are a disagreement between sources. “TLE age” is how many hours have passed since the epoch of the source's freshest set, plotted against when the set reached us, on a logarithmic scale. A set the source repeats unchanged does not reset the age.

Prediction divergence

Each TLE set is propagated with SGP4 to the epoch of the next set from the same source and compared with it, plotted against the epoch of the next set; the tooltip shows how many hours ahead the prediction ran. The logarithmic scale shows the size of the divergence and the tooltip its sign: plus along-track means the prediction is ahead of the satellite. This is how well the sets agree, not the true error: the reference is a TLE too, off by about a kilometre. An outlier is a manoeuvre between sets. Sets more than a week apart are not compared.

Time of closest approach, UTC Object 1 Object 2 Distance, km Speed, km/s Max. probability
2026-10-12 02:17:05 STARLINK-5624
NORAD 55416 		SEMI-1L
NORAD 66294 		3.206 5.67 1.2e-05
2026-10-12 06:32:23 SEMI-1L
NORAD 66294 		FRONTIERSAT
NORAD 69015 		3.455 7.52 3.3e-07
2026-10-13 03:50:05 SEMI-1L
NORAD 66294 		IRIDIUM 33 DEB
NORAD 46971 		4.205 5.81 2.3e-07
2026-10-13 03:55:42 SEMI-1L
NORAD 66294 		SL-19 R/B
NORAD 36039 		3.712 6.86 2.9e-07
2026-10-13 10:52:25 SEMI-1L
NORAD 66294 		FLOCK 4H-1
NORAD 66704 		0.692 14.10 4.5e-06
2026-10-14 01:26:25 SEMI-1L
NORAD 66294 		R5-S10
NORAD 100801 		3.354 8.09 3.4e-07
2026-10-14 20:00:14 SEMI-1L
NORAD 66294 		PIAST-S1
NORAD 66749 		4.332 14.28 1.1e-07
2026-10-14 20:50:42 SEMI-1L
NORAD 66294 		VICTUS HAZE PUMA
NORAD 69646 		4.633 6.88 1.9e-07
2026-10-16 13:49:27 SEMI-1L
NORAD 66294 		FOSSASA-2E23
NORAD 66788 		3.847 14.41 1.3e-07
2026-10-16 22:48:44 ZHANGHENG 1-02 (CSES-2)
NORAD 64393 		SEMI-1L
NORAD 66294 		4.073 13.50 1.5e-07
2026-10-16 23:18:05 ZIYUAN 3-02 (ZY 3-02)
NORAD 41556 		SEMI-1L
NORAD 66294 		1.121 14.43 1.6e-06
2026-10-17 04:17:35 OTTER PUP 2
NORAD 64537 		SEMI-1L
NORAD 66294 		4.505 13.80 1.1e-07
2026-10-17 04:48:34 SEMI-1L
NORAD 66294 		FLOCK 4H-31
NORAD 66734 		2.760 14.43 2.6e-07
2026-10-17 05:04:54 OTTER PUP 2
NORAD 64537 		SEMI-1L
NORAD 66294 		2.661 13.77 3.2e-07

Data: CelesTrak SOCRATES Plus, computed from TLEs of the public catalog. This is an estimate, not grounds for a manoeuvre: TLEs carry no covariance, and the maximum probability assumes a position error.

All conjunctions of this satellite