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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
520.32 km
Apogee
534.15 km
Inclination
97.4°
Period
95.2 min
Semi-major axis
6905.4 km
Velocity
7.59 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-10-10 20:56:59 UTC
Two-line elements (TLE)
1 66763U 25276DB  26283.47458698  .00002725  00000-0  16250-3 0  9995
2 66763  97.4097 352.5108 0009989 323.6684  36.3868 15.11949998 47761
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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
2026-10-11 10:13:41 STARLINK-4784
NORAD 53839 		HYDROGNSS-2
NORAD 66763 		3.484 8.21 9.5e-06
2026-10-12 02:31:14 AAC-HSI-SAT1
NORAD 56225 		HYDROGNSS-2
NORAD 66763 		4.042 14.88 1.0e-07
2026-10-12 04:06:30 AAC-HSI-SAT1
NORAD 56225 		HYDROGNSS-2
NORAD 66763 		2.837 14.88 2.1e-07
2026-10-12 10:17:10 STARLINK-5305
NORAD 55314 		HYDROGNSS-2
NORAD 66763 		3.908 15.09 3.1e-06
2026-10-13 05:39:32 HYDROGNSS-2
NORAD 66763 		OBJECT E
NORAD 69542 		2.243 0.22 8.8e-07
2026-10-13 06:29:18 HYDROGNSS-2
NORAD 66763 		OBJECT J
NORAD 100788 		2.922 0.55 5.2e-07
2026-10-13 12:02:53 HYDROGNSS-2
NORAD 66763 		OBJECT J
NORAD 100788 		3.361 0.55 3.9e-07
2026-10-14 09:26:32 HYDROGNSS-2
NORAD 66763 		IRIDIUM 33 DEB
NORAD 36028 		1.107 15.05 1.3e-06
2026-10-14 12:11:28 STARLINK-5180
NORAD 55318 		HYDROGNSS-2
NORAD 66763 		1.598 15.09 1.8e-05
2026-10-15 12:02:03 HYDROGNSS-2
NORAD 66763 		DISKSAT C
NORAD 67219 		3.827 14.30 1.4e-07
2026-10-15 13:30:25 STARLINK-5053
NORAD 53913 		HYDROGNSS-2
NORAD 66763 		4.842 7.98 4.9e-06
2026-10-15 22:08:31 HYDROGNSS-2
NORAD 66763 		AISAT
NORAD 40054 		2.868 14.44 2.4e-07
2026-10-16 21:04:33 HYDROGNSS-2
NORAD 66763 		COSMOS 1275 DEB
NORAD 42101 		2.208 13.91 4.6e-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