▸Orbital parameters

Orbit class	LEO
Inclination	51.6346°
Eccentricity	0.0007535
Period	92.1 min
Apogee	382 km
Perigee	372 km
Mean motion	15.63756217 rev/day
RAAN	70.1584°
Arg of perigee	87.0654°
Mean anomaly	273.1203°
B*	2.3940e-4
Rev at epoch	3,233

▸Two-line element set (TLE)

EPOCH May 22, 2026SOURCE CelesTrakDERIVED staleUPDATED Jul 7, 2026

1 66174U 25241A 26142.44594321 .00022374 00000-0 23940-3 0 9994

2 66174 51.6346 70.1584 0007535 87.0654 273.1203 15.63756217 32338

▸ source OMM (JSON)

{
  "OBJECT_NAME": "HTV-X1",
  "OBJECT_ID": "2025-241A",
  "EPOCH": "2026-05-22T10:42:09.493+00:00",
  "MEAN_MOTION": 15.63756217,
  "ECCENTRICITY": 0.0007535,
  "INCLINATION": 51.6346,
  "RA_OF_ASC_NODE": 70.1584,
  "ARG_OF_PERICENTER": 87.0654,
  "MEAN_ANOMALY": 273.1203,
  "EPHEMERIS_TYPE": 0,
  "CLASSIFICATION_TYPE": "U",
  "NORAD_CAT_ID": 66174,
  "REV_AT_EPOCH": 3233,
  "BSTAR": 0.0002394,
  "MEAN_MOTION_DOT": 0.00022374,
  "MEAN_MOTION_DDOT": 0
}

Reconstructed from CelesTrak OMM mean-elements (element-set number is a placeholder). TLE/OMM data is approximate. Not for operational use or collision avoidance.

▸Satellite metadata

Name	HTV-X1
Operator	Japan Aerospace Exploration AgencyHIGHvia GCAT — Jonathan McDowell's General Catalog Japan Aerospace Exploration AgencyMEDIUMvia Wikidata
Country	JapanMEDIUMvia Wikidata
Launch date	Oct 26, 2025HIGHvia GCAT — Jonathan McDowell's General Catalog
Launch mass (kg)	10000HIGH

▸Data quality

Score95 / 100

Claims9

Sources3

TLEavailable

▸Sources

GCAT — Jonathan McDowell's General CatalogCC BY 4.0planet4589.org
WikidataCC0 1.0query.wikidata.org
OrbitalWiki manual curationCC-BY 4.0

▸Actions

GET /api/v1/satellites/66174

//Orbital data is approximate and not for operational use. Last ingested from CelesTrak on Jul 7, 2026.