RU | EN | ZH --:-- UTC Sign in
Back

FLOCK 4H-28

In orbit NORAD 66731 XKNI-8571-7707-4470-3208

Observations 0
Satellite appearance

—

Falcon 9 Block 5 | Transporter 15 (Dedicated SSO Rideshare)

Falcon 9 Block 5

Carrier rocket

Space Launch Complex 4E

Spaceport

0

Observations all time

Mission information
Spacecraft name
FLOCK 4H-28
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 | Transporter 15 (Dedicated SSO Rideshare)
Carrier rocket
Falcon 9 Block 5
Spaceport
Space Launch Complex 4E
Launch time
Separation time
Satellite appearance
Data for the last 30 days
Orbital parameters of the satellite
Perigee
501.05 km
Apogee
505.91 km
Inclination
97.4°
Period
94.8 min
Semi-major axis
6881.6 km
Velocity
7.61 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-06-29 17:58:47 UTC
Two-line elements (TLE)
1 66731U 25276BT  26180.15746193  .00005715  00000+0  27018-3 0  9996
2 66731  97.4183 253.3532 0003532 349.8489  10.2674 15.19776403 32231
Copy content
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
2026-10-11 06:08:43 TRANSPORTER-13 OBJECT M
NORAD 63221 		FLOCK 4H-28
NORAD 66731 		1.972 15.10 4.0e-07
2026-10-11 07:43:23 TRANSPORTER-13 OBJECT M
NORAD 63221 		FLOCK 4H-28
NORAD 66731 		1.819 15.10 4.7e-07
2026-10-12 14:07:40 VEGAFLY-1
NORAD 68430 		FLOCK 4H-28
NORAD 66731 		3.315 12.69 2.5e-07
2026-10-14 07:56:57 R5-S10
NORAD 100801 		FLOCK 4H-28
NORAD 66731 		2.243 12.60 5.5e-07
2026-10-14 08:26:51 YAOGAN-39 03C
NORAD 57990 		FLOCK 4H-28
NORAD 66731 		3.778 11.07 2.3e-07
2026-10-16 00:09:46 PROBA-1
NORAD 26958 		FLOCK 4H-28
NORAD 66731 		2.835 7.40 3.1e-07
2026-10-16 04:55:34 DB-PFW
NORAD 68466 		FLOCK 4H-28
NORAD 66731 		4.803 12.72 1.2e-07
2026-10-16 23:01:56 OBJECT D
NORAD 67251 		FLOCK 4H-28
NORAD 66731 		1.431 0.83 2.1e-06

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