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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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: 9 hours ago

TLE from 9 hours ago

0 ISS (ZARYA)
1 25544U 98067A   26050.57060042  .00006828  00000-0  13586-3 0  9997
2 25544  51.6323 161.9142 0008604 112.9152 247.2745 15.48140240553525

Epoch: 2026-02-19T13:41Z

TLE epoch observation values (Epoch: 2026-02-19T13:41:39.876Z)

Latitude

-0.00001°

Longitude

166.97805°

Altitude

425.171 km

Speed

7.656 km/s

True Right ascension

10h 47m 39s

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

01:53:28

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

428.527 km

Perigee altitude

416.824 km

Semi-major axis

6,800.812 km

Eccentricity

0.00086

Inclination

51.6323°

RAAN

161.9142°

Arg. of periapsis

112.9152°

True anomaly

247.1836°

Mean anomaly

247.2745°

Eccentric anomaly

247.22904°

Mean motion

3.86992 °/min

Orbital period

93.03 mins

BSTAR

0.00013586

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

MOONLIGHTER, 57316 (Decayed)

YUKONSAT, 56316 (Decayed)

FLOCK 2EP 3, 41480 (Decayed)

CAPSAT 1, 53770 (Decayed)

F-1, 38855 (Decayed)

FLOCK 2E 2, 41484 (Decayed)

ISS DEB (SEDA-AP), 43870 (Decayed)

OBJECT B, 59507 (Decayed)

ISS DEB, 31605 (Decayed)

OBJECT RC, 45259 (Decayed)

CADRE, 41475 (Decayed)

IRAZU, 43468 (Decayed)

BEEAGLESAT, 42736 (Decayed)

DEMI, 45916 (Decayed)

ISS DEB, 35634 (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	2026-02-20 10:01:21.157Z	221.436° SW	2026-02-20 10:03:21.157Z	187.614° SSW	41.037°	2026-02-20 10:06:21.157Z	58.476° ENE
4 mins	2026-02-20 11:39:21.157Z	302.144° NW	2026-02-20 11:41:21.157Z	350.196° N	18.703°	2026-02-20 11:43:21.157Z	27.467° NE
4 mins	2026-02-20 16:32:21.157Z	311.22° NW	2026-02-20 16:34:21.157Z	109.478° ESE	42.517°	2026-02-20 16:36:21.157Z	124.553° 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

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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: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2026-02-19T13:41:39.876Z)

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: 9 hours ago