DECAYED

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HTV-X1, 66174 (Decayed)

Orbit data source: Space-Track

HTV-X1, 66174 was 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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<iframe src="https://www.satcat.com/sats-embedded/66174?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/66174?theme=dark&initialShowStats=false

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Identifier

66174, 2025-241A

Orbit

Decayed

Country

JP / JPN

Related business

JAXA (Japan Aerospace Exploration Agency) (JP)

Manufacturer

MHITO?

Mission

Decayed Civil Spaceship

Bus & Motor

HTV-X, HBT-5 X 4

Mass

16,000 kg wet, 7,600 kg dry

Launch date (UTC)

2025-10-26 (8 months ago)

Launch vehicle

H3-24W

Launch site

Tanegashima Space Center (TNSTA)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 2 Pan, 11.0 m

Radar Cross Section

51.510 m², Large (>1 m²)

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Last TLE update: 4 weeks ago

TLE from 4 weeks ago

0 HTV-X1
1 66174U 25241A   26146.23519729  .00028651  00000-0  29012-3 0  9994
2 66174  51.6375  51.4083 0007157  89.2746 270.9069 15.65005268 32916

Epoch: 2026-05-26T05:38Z

TLE epoch observation values (Epoch: 2026-05-26T05:38:41.045Z)

Latitude

-0.00006°

Longitude

82.92568°

Altitude

373.897 km

Speed

7.687 km/s

True Right ascension

03h 25m 37s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

10:18:54

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

378.567 km

Perigee altitude

368.903 km

Semi-major axis

6,751.872 km

Eccentricity

0.00072

Inclination

51.6375°

RAAN

51.4083°

Arg. of periapsis

89.2746°

True anomaly

270.8249°

Mean anomaly

270.9069°

Eccentric anomaly

270.8659°

Mean motion

3.91207 °/min

Orbital period

92.02 mins

BSTAR

0.00029012

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Other satellites on launch #241 in the year 2025 (2025-10-26 UTC)

TEN-KOH 2, 68261

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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	2026-06-21 09:50:39.861Z	202.923° SW	2026-06-21 09:52:39.861Z	138.357° SSE	33.515°	2026-06-21 09:54:39.861Z	72.399° E
4 mins	2026-06-21 16:16:39.861Z	330.702° NNW	2026-06-21 16:17:39.861Z	3.625° NNE	34.297°	2026-06-21 16:20:39.861Z	107.654° ESE

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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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Check out HTV-X1, 66174 (Decayed) on other resources

View HTV-X1, 66174 (Decayed) on Celestrak

View HTV-X1, 66174 (Decayed) on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

HTV-X1, 66174 (Decayed)

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 4 weeks ago

TLE from 4 weeks ago

TLE epoch observation values (Epoch: 2026-05-26T05:38:41.045Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #241 in the year 2025 (2025-10-26 UTC)

HTV-X1 Visibility forecast

Co-orbital & Co-planar RSOs

Check out HTV-X1, 66174 (Decayed) on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 4 weeks ago