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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<iframe src="https://www.satcat.com/sats-embedded/25544?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

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https://www.satcat.com/sats-embedded/25544?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

25544, 1998-067A

Orbit

LEO

Country

CIS

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

Khrunichev

Mission

Operational Civil Spaceship

Bus & Motor

77KS, Unknown motor

Mass

20,351 kg wet, ~19,000 kg dry

Launch date (UTC)

1998-11-20 (27 years ago)

Launch vehicle

PROTON-K

Launch site

Tyuratam Missile And Space Complex (TTMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Irr, 66.1 m

Radar Cross Section

5762.400 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 14 hours ago

TLE from 14 hours ago

0 ISS (ZARYA)
1 25544U 98067A   26064.77024645  .00007682  00000-0  15013-3 0  9999
2 25544  51.6317  91.7338 0008144 160.7168 199.4130 15.48462755555720

Epoch: 2026-03-05T18:29Z

TLE epoch observation values (Epoch: 2026-03-05T18:29:09.293Z)

Latitude

0°

Longitude

10.92925°

Altitude

427.185 km

Speed

7.654 km/s

True Right ascension

06h 06m 56s

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

12:50:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

427.269 km

Perigee altitude

416.194 km

Semi-major axis

6,799.868 km

Eccentricity

0.00081

Inclination

51.6317°

RAAN

91.7338°

Arg. of periapsis

160.7168°

True anomaly

199.38201°

Mean anomaly

199.413°

Eccentric anomaly

199.3975°

Mean motion

3.87073 °/min

Orbital period

93.01 mins

BSTAR

0.00015013

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Other satellites on launch #67 in the year 1998 (1998-11-20 UTC)

FLOCK 1B 9, 40430 (Decayed)

OSNSAT, 41939 (Decayed)

OBJECT XH, 65729 (Decayed)

TANCREDO 1, 41931 (Decayed)

OBJECT XM, 65733 (Decayed)

PICODRAGON, 39413 (Decayed)

OBJECT XL, 65732 (Decayed)

ISS DEB, 44789 (Decayed)

HRC MONOBLOCK CAMERA, 66052

OBJECT XW, 66910

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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	2026-03-06 10:26:37.232Z	326.258° NNW	2026-03-06 10:28:37.232Z	12.098° NNE	30.109°	2026-03-06 10:31:37.232Z	96.348° ESE
5 mins	2026-03-07 04:46:37.232Z	253.475° W	2026-03-07 04:48:37.232Z	311.607° NW	38.489°	2026-03-07 04:51:37.232Z	43.088° NE

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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 ISS (ZARYA), 25544 on other resources

View ISS (ZARYA), 25544 on NASA - NSSDCA Website

View ISS (ZARYA), 25544 on Heavens-Above

View ISS (ZARYA), 25544 on Keep Track

View ISS (ZARYA), 25544 on Celestrak

View ISS (ZARYA), 25544 on Gunter's Space Page

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

ISS (ZARYA), 25544

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-03-05T18:29:09.293Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #67 in the year 1998 (1998-11-20 UTC)

ISS (ZARYA) Visibility forecast

Co-orbital & Co-planar RSOs

Check out ISS (ZARYA), 25544 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 14 hours ago