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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Edit Public Description
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: 16 hours ago
TLE from 16 hours ago
0 ISS (ZARYA)
1 25544U 98067A 25338.09188027 .00015824 00000-0 29177-3 0 9995
2 25544 51.6302 185.2932 0003628 200.9086 159.1754 15.49293095541518Epoch: 2025-12-04T02:12Z
TLE epoch observation values (Epoch: 2025-12-04T02:12:18.455Z)
Latitude
-0.00006°
Longitude
79.06296°
Altitude
421.838 km
Speed
7.658 km/s
True Right ascension
12h 21m 10s
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
15:49:16
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
421.768 km
Perigee altitude
416.836 km
Semi-major axis
6,797.439 km
Eccentricity
0.00036
Inclination
51.6302°
RAAN
185.2932°
Arg. of periapsis
200.9086°
True anomaly
159.19017°
Mean anomaly
159.1754°
Eccentric anomaly
159.18279°
Mean motion
3.8728 °/min
Orbital period
92.96 mins
BSTAR
0.00029177
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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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2025-12-04 17:55:33.478Z | 277.82° WNW | 2025-12-04 17:57:33.478Z | 325.956° NNW | 25.79° | 2025-12-04 18:00:33.478Z | 34.189° NE |
| 5 mins | 2025-12-04 22:48:33.478Z | 324.464° NNW | 2025-12-04 22:50:33.478Z | 20.188° NNE | 34.936° | 2025-12-04 22:53:33.478Z | 104.691° ESE |
| 4 mins | 2025-12-05 17:08:33.478Z | 273.61° WNW | 2025-12-05 17:09:33.478Z | 308.918° NW | 33.83° | 2025-12-05 17:12:33.478Z | 38.852° NE |
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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