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

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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)

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Last TLE update: 15 hours ago

TLE from 15 hours ago

0 ISS (ZARYA)
1 25544U 98067A   26111.74820811  .00009534  00000-0  18169-3 0  9991
2 25544  51.6323 219.4368 0006711 334.6967  25.3692 15.48877266563003

Epoch: 2026-04-21T17:57Z

TLE epoch observation values (Epoch: 2026-04-21T17:57:25.180Z)

Latitude

-0.00002°

Longitude

100.26233°

Altitude

416.628 km

Speed

7.665 km/s

True Right ascension

14h 37m 44s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

15:39:00

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

425.081 km

Perigee altitude

415.956 km

Semi-major axis

6,798.655 km

Eccentricity

0.00067

Inclination

51.6323°

RAAN

219.4368°

Arg. of periapsis

334.6967°

True anomaly

25.40217°

Mean anomaly

25.3692°

Eccentric anomaly

25.38568°

Mean motion

3.87176 °/min

Orbital period

92.98 mins

BSTAR

0.00018169

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

FLOCK 2E 9, 41571 (Decayed)

TOMSK-TPU 120, 42910 (Decayed)

OBJECT XC, 62296 (Decayed)

ISS DEB, 40281 (Decayed)

ISS DEB, 57599 (Decayed)

ISS DEB (VSPLESK PLTFRM), 39496 (Decayed)

ISS DEB, 28409 (Decayed)

ISS DEB, 27507 (Decayed)

ISS DEB, 27522 (Decayed)

ISS DEB, 28635 (Decayed)

ISS DEB, 28408 (Decayed)

ISS DEB, 26952 (Decayed)

ISS DEB, 37353 (Decayed)

ISS DEB, 27505 (Decayed)

SWIATOWID, 44426 (Decayed)

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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	2026-04-22 09:36:47.707Z	208.303° SW	2026-04-22 09:39:47.707Z	121.072° SE	34.363°	2026-04-22 09:41:47.707Z	69.987° E
4 mins	2026-04-22 11:14:47.707Z	291.401° WNW	2026-04-22 11:16:47.707Z	345.17° N	22.742°	2026-04-22 11:18:47.707Z	27.525° NE
5 mins	2026-04-22 16:07:47.707Z	324.01° NNW	2026-04-22 16:09:47.707Z	56.86° ENE	38.839°	2026-04-22 16:12:47.707Z	113.648° SE

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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

Please sign-in to view Co-orbital & Co-planar RSOs.

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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: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-04-21T17:57:25.180Z)

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: 15 hours ago