ISS (ZARYA), 25544
Orbit data source: Space-Track
The International Space Station (ISS) is a collaborative project involving NASA, Roscosmos, ESA, JAXA, and CSA. It is the largest human-made structure in low Earth orbit (LEO). It serves as a microgravity laboratory where scientific research is conducted in various fields, such as astrobiology, astronomy, meteorology, and physics. Astronauts have continuously inhabited the ISS since Nov 2000, and the space station supports testing spacecraft systems and equipment needed for long-duration missions to the Moon and Mars.
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25544 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
Khrunichev
Mission
Operational Civil Spaceship
Bus & Motor
77KS, Unknown motor
Mass
20,351 kg wet, ~19,000 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Irr, 66.1 m
Radar Cross Section
5762.400 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 ISS (ZARYA)
1 25544U 98067A 26246.56303513 .00003925 00000-0 79431-4 0 9993
2 25544 51.6315 272.1807 0005017 103.2669 256.8879 15.48980167583909Epoch: 2026-09-03T13:30Z
TLE epoch observation values (Epoch: 2026-09-03T13:30:46.235Z)
Latitude
-0.00002°
Longitude
86.78862°
Altitude
421.224 km
Speed
7.659 km/s
True Right ascension
18h 08m 43s
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
19:38:36
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
423.628 km
Perigee altitude
416.807 km
Semi-major axis
6,798.354 km
Eccentricity
0.0005
Inclination
51.6315°
RAAN
272.1807°
Arg. of periapsis
103.2669°
True anomaly
256.83192°
Mean anomaly
256.8879°
Eccentric anomaly
256.85991°
Mean motion
3.87202 °/min
Orbital period
92.97 mins
BSTAR
0.000079431
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Other satellites on launch #67 in the year 1998 (1998-11-20 UTC)
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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.ISS (ZARYA) 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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2026-09-04 05:11:56.289Z | 250.18° W | 2026-09-04 05:14:56.289Z | 321.904° NNW | 37.52° | 2026-09-04 05:17:56.289Z | 42.775° NE |
| 5 mins | 2026-09-04 11:42:56.289Z | 284.49° WNW | 2026-09-04 11:44:56.289Z | 223.129° SW | 32.475° | 2026-09-04 11:47:56.289Z | 153.426° SSE |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
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