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LEO EXPRESS 3

In orbit NORAD 66687 HSIP-4826-4306-9169-8017

Observations 0
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Transporter-15 Rideshare : VSFB SLC-4E

Falcon 9

Carrier rocket

База Вандерберг

Spaceport

0

Observations all time

Mission information
Spacecraft name
LEO EXPRESS 3
Status
Active
The satellite is in orbit
The network has not received data from this satellite for a long time
Launch and timeline
Launch
Transporter-15 Rideshare : VSFB SLC-4E
Carrier rocket
Falcon 9
Spaceport
База Вандерберг
Launch time
Separation time
Satellite appearance
Data for the last 30 days
Orbital parameters of the satellite
Perigee
489.97 km
Apogee
497.14 km
Inclination
97.4°
Period
94.5 min
Semi-major axis
6871.7 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 66687U 25276X   26282.63318256  .00011377  00000-0  48534-3 0  9995
2 66687  97.4168 354.8098 0005221 108.5247 251.6557 15.23067540 47830
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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
2026-10-10 18:57:29 TOMORROW-S9
NORAD 66309 		LEO EXPRESS 3
NORAD 66687 		1.567 13.55 9.8e-07
2026-10-11 16:15:07 LEO EXPRESS 3
NORAD 66687 		COSMOS 2251 DEB
NORAD 34451 		4.834 15.17 6.5e-08
2026-10-11 22:31:01 LEO EXPRESS 3
NORAD 66687 		CHUBUSAT-2
NORAD 41338 		3.795 11.01 2.2e-07
2026-10-12 11:16:38 STARLINK-5541
NORAD 56475 		LEO EXPRESS 3
NORAD 66687 		4.528 8.30 5.6e-06
2026-10-12 21:28:05 LEO EXPRESS 3
NORAD 66687 		HULIANWANG JISHU SHIYAN 9B
NORAD 68832 		4.199 13.61 1.3e-07
2026-10-13 06:51:13 YAOGAN-42 02
NORAD 59557 		LEO EXPRESS 3
NORAD 66687 		4.409 12.34 1.5e-07
2026-10-13 14:48:19 LEO EXPRESS 3
NORAD 66687 		HULIANWANG JISHU SHIYAN 10A
NORAD 69320 		4.204 13.79 1.3e-07
2026-10-13 16:31:19 ZHANGHENG 1-01 (CSES-1)
NORAD 43194 		LEO EXPRESS 3
NORAD 66687 		4.237 11.19 1.8e-07
2026-10-13 23:38:48 LEO EXPRESS 3
NORAD 66687 		PHI 1
NORAD 66775 		4.906 0.02 1.8e-07
2026-10-14 01:14:54 LEO EXPRESS 3
NORAD 66687 		LEMUR-2-LAILA
NORAD 66776 		4.327 0.01 1.8e-07
2026-10-14 08:38:52 CHAMRAN-1
NORAD 61072 		LEO EXPRESS 3
NORAD 66687 		1.765 4.57 1.4e-06
2026-10-14 09:57:11 LEO EXPRESS 3
NORAD 66687 		PEAKSAT
NORAD 68416 		4.120 12.69 1.6e-07
2026-10-15 10:21:39 SUPERVIEW NEO-2 01
NORAD 53128 		LEO EXPRESS 3
NORAD 66687 		3.924 7.98 2.5e-07
2026-10-16 22:10:36 ION SCV-017
NORAD 63230 		LEO EXPRESS 3
NORAD 66687 		3.172 15.09 1.6e-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