NAVSTAR 77 (USA 289)

LIVE

Link to this page

https://orbinauts.com/satellites/43873

  • Navigation satellite
  • NORAD 43873
  • 2018-109A
  • Medium Earth orbit

Current orbit

Where NAVSTAR 77 (USA 289) is on the world map, with the orbit it is flying
View on live map

Orbit began over the Indian Ocean

Orbit ends over the Pacific Ocean

Past trackNext orbits

In view from you

Nobody watches NAVSTAR 77 (USA 289) go over, but a receiver still asks whether it is above the horizon. Say where you are and this card answers.

Your position is rounded to about a kilometre and sent only to the Orbinauts API, to find the pass.

No brightness has been published for NAVSTAR 77 (USA 289), so it is not a naked-eye satellite and no city page carries pass times for it. Nothing here estimates one.

Seeing it

There is nothing to go outside for: it is far too high and too faint for the naked eye. What you notice of it is a position fix, and the card above says whether it is above your horizon to give you one.

Timeline

  1. Milestone

    It was launched. Source

  2. Milestone

    Its operator set it usable, and receivers on the ground began to count on it. Source

  3. Outage

    It was out of service from Aug 16, 2025, 10:59 AM to Aug 22, 2025, 7:18 PM, which its operator had not forecast. Source

  4. Outage

    Its operator took it out of service from Oct 16, 2025, 6:15 PM to Oct 17, 2025, 2:48 AM, as it had forecast. Source

Summary

Over the Pacific Ocean LIVE

Where is NAVSTAR 77 (USA 289)?

At 8:56:26 PM UTC NAVSTAR 77 (USA 289) was over the Pacific Ocean (55.7° N, 135.5° W), 20,222 km up, moving at 3.87 km/s and in sunlight.

What is NAVSTAR 77 (USA 289)?

A navigation satellite in medium Earth orbit, one of the 32 navigation satellites of the GPS constellation.

Can I see NAVSTAR 77 (USA 289)?

No, not with the naked eye: no brightness has been published for NAVSTAR 77 (USA 289), and nothing here estimates one; receivers on the ground use its signals instead, whenever it is above their horizon.

General

NAVSTAR 77 (USA 289) is one of the 32 navigation satellites of the GPS constellation. See every GPS satellite and how many are above you right now.

Known to its operator as
PRN 4
Space vehicle number
74
Clock in use
Rubidium
Generation
GPS Block III
Signals
L1 C/A, P(Y) on L1 and L2, L2C, M-code, L5, and L1C
Design life
15 years
Built by
Lockheed Martin
Typical altitude
20,000 to 20,400 km

Latest orbital data

Position received
8:56 PM UTC
Station time (UTC)
8:56 PM UTC
Latitude / longitude
55.7° N, 135.5° W
Altitude
20,222 km
Speed
3.87 km/s (13,932 km/h)
Course
east
Light
In sunlight
Inclination
55.7°
Orbital period
718 minutes
Orbits per day
2.01
This orbit
20,075 to 20,289 km
In shadow
None of this orbit
In view from
Within 7,380 km of the point below it
Elements epoch
Sep 17, 2026, 5:57 PM, 1 day old
Source
Position from Space-Track orbital elements of Sep 17, 2026, 5:57 PM, 1 day old.

No operator publishes an ephemeris for NAVSTAR 77 (USA 289), so every position here comes from its orbital elements.

In service

A receiver can count on it now.

Usable now
Yes: its operator has published no outage in force.
Plane and slot
Plane F, slot 4
In service since
Jan 13, 2020 Notice
Age against design life
6.7 of the 15 years it was built to last
Last outage
Oct 16, 2025, 6:15 PM to Oct 17, 2025, 2:48 AM, forecast Notice

From GPS’s own notices, as its operator published them on Sep 16, 2026, 1:55 AM.

In orbit

Close approaches
Close approaches to NAVSTAR 77 (USA 289) are not available right now. Try again in a few minutes.

See every close approach reported in orbit.

Beside the others

ConstellationSatellitesTypical altitudeOrbital periodPlanesOperator
GPS3220,000 to 20,400 km718 minutes6The United States Space Force
Galileo2723,100 to 23,300 km845 minutes—EUSPA, the European Union Agency for the Space Programme
BeiDou3721,450 to 21,600 km773 minutes—The China Satellite Navigation Office
GLONASS2219,050 to 19,200 km676 minutes—Roscosmos, the Russian State Space Corporation

Data and API

The current elements from Space-Track as an OMM object, epoch Sep 17, 2026, 5:57 PM, 1 day old.

{
  "OBJECT_NAME": "NAVSTAR 77 (USA 289)",
  "OBJECT_ID": "2018-109A",
  "EPOCH": "2026-09-17T17:57:33.144192",
  "MEAN_MOTION": 2.00565437,
  "ECCENTRICITY": 0.00402595,
  "INCLINATION": 55.7424,
  "RA_OF_ASC_NODE": 88.5348,
  "ARG_OF_PERICENTER": 196.255,
  "MEAN_ANOMALY": 161.2701,
  "EPHEMERIS_TYPE": 0,
  "CLASSIFICATION_TYPE": "U",
  "NORAD_CAT_ID": 43873,
  "ELEMENT_SET_NO": 999,
  "REV_AT_EPOCH": 5692,
  "BSTAR": 0,
  "MEAN_MOTION_DOT": -3e-8,
  "MEAN_MOTION_DDOT": 0
}