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HYDROGNSS-2

In orbit NORAD 66763 UUME-2328-9296-9738-9467 ESA

Observations 0
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2025

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
HYDROGNSS-2
Website
https://www.hydrognss.org/
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
2025-11-28 18:44:30
Separation time
2025-11-28 20:06:32
Satellite appearance
Operator
ESA
Data for the last 30 days
Orbital parameters of the satellite
Perigee
520.45 km
Apogee
533.89 km
Inclination
97.4°
Period
95.2 min
Semi-major axis
6905.3 km
Velocity
7.59 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-10-14 06:09:05 UTC
Two-line elements (TLE)
1 66763U 25276DB  26286.78364226  .00002584  00000-0  15417-3 0  9992
2 66763  97.4085 355.7204 0009695 311.1893  48.8501 15.11972004 48260
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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
2026-10-14 17:23:06 HYDROGNSS-2
NORAD 66763 		IRIDIUM 33 DEB
NORAD 36028 		3.474 15.04 1.3e-07
2026-10-14 18:58:28 HYDROGNSS-2
NORAD 66763 		IRIDIUM 33 DEB
NORAD 36028 		2.618 15.04 2.3e-07
2026-10-15 05:19:39 HYDROGNSS-2
NORAD 66763 		FENGYUN 1C DEB
NORAD 31877 		4.434 7.18 2.0e-07
2026-10-15 13:23:04 STARLINK-6326
NORAD 56787 		HYDROGNSS-2
NORAD 66763 		2.326 13.83 1.3e-05
2026-10-15 23:43:47 HYDROGNSS-2
NORAD 66763 		AISAT
NORAD 40054 		3.062 14.44 2.1e-07
2026-10-16 18:01:13 SMDC ONE 1.2
NORAD 38759 		HYDROGNSS-2
NORAD 66763 		3.479 14.22 1.7e-07
2026-10-17 14:02:57 STARLINK-4773
NORAD 53838 		HYDROGNSS-2
NORAD 66763 		4.458 6.09 6.2e-06
2026-10-17 22:37:55 HYDROGNSS-2
NORAD 66763 		COSMOS 2251 DEB
NORAD 40797 		2.750 15.03 2.1e-07
2026-10-18 13:24:45 STARLINK-5317
NORAD 55283 		HYDROGNSS-2
NORAD 66763 		4.973 14.87 2.1e-06
2026-10-18 15:09:04 HYDROGNSS-2
NORAD 66763 		CZ-6A DEB
NORAD 61426 		4.605 11.32 1.5e-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