HTV-X1, 66174
Orbit data source: Space-Track
HTV-X1, 66174 is a payload satellite owned by JAXA (JP) in LEO that was launched on Sun, 26 Oct 2025 UTC via a H3-24W launch vehicle from the Tanegashima Space Center (TNSTA). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
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66174 intel report (Beta)
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Identifier
Orbit
Country
JP / JPNRelated business
Manufacturer
MHITO?
Mission
Operational Civil Spaceship
Bus & Motor
HTV-X, HBT-5 X 4
Mass
16,000 kg wet, 7,600 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl + 2 Pan, 14.5 m
Radar Cross Section
51.510 m²
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 HTV-X1
1 66174U 25241A 26061.54331036 .00009842 00000-0 19033-3 0 9990
2 66174 51.6317 107.6867 0008241 149.4104 210.7366 15.48401384554942Epoch: 2026-03-02T13:02Z
TLE epoch observation values (Epoch: 2026-03-02T13:02:22.015Z)
Latitude
-0.00001°
Longitude
111.75975°
Altitude
426.959 km
Speed
7.654 km/s
True Right ascension
07h 10m 44s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
06:58:33
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
427.515 km
Perigee altitude
416.307 km
Semi-major axis
6,800.048 km
Eccentricity
0.00082
Inclination
51.6317°
RAAN
107.6867°
Arg. of periapsis
149.4104°
True anomaly
210.68838°
Mean anomaly
210.7366°
Eccentric anomaly
210.71248°
Mean motion
3.87057 °/min
Orbital period
93.01 mins
BSTAR
0.00019033
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Other satellites on launch #241 in the year 2025 (2025-10-26 UTC)
No other RSOs were in this launch
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.HTV-X1 Visibility forecast
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Span | Click to sort rows by Start time (UTC) header in descending order | Start Az. | Max El. time (UTC) | Max El. Az. | Max El. | End time (UTC) | End Az. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-03-03 06:18:21.348Z | 260.767° W | 2026-03-03 06:19:21.348Z | 298.018° NW | 38.627° | 2026-03-03 06:22:21.348Z | 43.271° NE |
| 4 mins | 2026-03-03 11:11:21.348Z | 345.94° N | 2026-03-03 11:12:21.348Z | 10.715° NNE | 22.175° | 2026-03-03 11:15:21.348Z | 80.491° E |
| 4 mins | 2026-03-03 12:48:21.348Z | 279.794° WNW | 2026-03-03 12:49:21.348Z | 247.993° W | 33.583° | 2026-03-03 12:52:21.348Z | 152.422° SSE |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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