NAVSTAR 77 (USA 289) (43873)

COSPAR: 2018-109A | Alt Name: GPS III SV01

Image

Additional Sources

Launch Details

Launch Date

December 23, 2018

Launch Site

Cape Canaveral Space Force Station

Launch Pad

LC40

Launch Vehicle

Falcon 9

Orbital Elements

NORAD ID

43873

International Designator

2018-109A

Epoch

Fri, 03 Jul 2026 17:38:45 GMT

Apogee

Calculating...

Perigee

Calculating...

Inclination

55.69°

Right Ascension

91.53°

Eccentricity

Calculating...

Argument of Perigee

197.47°

Period

717.98 min

Mean Motion

2.01 rev/day

Latitude

Calculating...

Longitude

Calculating...

Altitude

Calculating...

Velocity

Calculating...

Polar Plot

3D Visualization

Basic Satellite Info

Name

NAVSTAR 77 (USA 289)

Alternative Name

GPS III SV01

Type

Payload

Status

Operational

Owner

AFSMC

Country

United States

Constellation

N/A

Related Satellites

Major Events

N/A

Latest TLEs

1 43873U 18109A   26184.73524921 -.00000005  00000-0  00000-0 0  9994

2 43873  55.6910  91.5344 0038559 197.4684 354.7406  2.00562540 55405

Source: Celestrak

Summary

NAVSTAR 77 (USA 289), also known as GPS III SV01, is a navigation satellite with an object ID of 2018-109A and NORAD catalog number 43873. It was launched on December 23, 2018, from the Air Force Eastern Test Range (AFETR) Launch Complex 40 using a Falcon 9 launch vehicle. The satellite has dimensions of 3.4 meters in length, 1.8 meters in diameter, and a span of 14 meters when its solar arrays are deployed. It weighs 2160 kg dry and had an initial launch mass of 4400 kg. Constructed by LMSSD for the AFSMC (Air Force Space and Missile Systems Center), NAVSTAR 77 is part of the GPS constellation with a mission life of 15 years. The satellite's configuration includes two deployable solar arrays, batteries for power storage, and AOCS (Attitude and Orbit Control System) motor control. Its shape is described as box-shaped with two panels.

Physical Characteristics

Length

3.4

Diameter

1.8

Span

Dry Mass

2160

Launch Mass

4400

Shape

Box + 2 pan

Radar Cross Section

Unknown

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

GPS SVN 74

Purpose

Navigation

Mission

Navigation

Manufacturer

LMSSD

Life Expectancy

15 years

Bus

A2100

Configuration

A2100A

Motor

AOCS

Equipment

Power System

2 deployable solar arrays, batteries

ADCS

Unknown

Transmitter Frequency

Unknown

Map

This tool will help you track the satellite's position and predict its upcoming passes over your location. Simply input the coordinates or click the geolocation button to get started.

Latitude

Longitude

Next Pass

Azimuth Elevation Time (Local)

Start Azimuth

Max Elevation

Stop Azimuth

Time Until

Pass Duration

Satellite Articles

View All Posts »

Learn more about satellites and other related topics.

GOES-G | The Day a Weather Satellite Exploded Over the Atlantic

Forty years ago today, a Delta 3914 lifted off Cape Canaveral with a weather satellite the country could not afford to lose. Seventy-one seconds later, its main engine cut off. Ninety-one seconds in, the range safety officer pressed his button. The third domino of a brutal 1986 had fallen.

X Report 28 Oct 2025

SpaceX successfully launched 28 Starlink satellites and settled a lawsuit, while Starlink's performance faces scrutiny in Ukraine. Additionally, MTN is enhancing Starlink's business services.

Space Brief 18 Nov 2024

Today’s Space Brief covers the deployment of a new optical sensor for the Space Force, SpaceX's recent Starlink satellite launch, and significant investment in space cargo vehicles.

Space Brief 7 Dec 2025

Today's highlights include a record-breaking event at the International Space Station, significant funding for hypersonic missile production, and several key military developments impacting space strategy.

X Report 7 Aug 2025

SpaceX's Crew-10 astronauts are set to return to Earth, while Impulse Space takes strides in spacecraft capabilities. Additionally, SpaceX prepares to launch 24 Amazon Project Kuiper satellites.

Space Brief 5 Nov 2025

Today's focus: Sidus Space's new AI edge computer, Space Force's dynamic operations initiative, and key Pentagon acquisition reforms.

Space Brief 23 Feb 2025

SpaceX launches Starlink satellites from both coasts, while first 3D atmospheric map of an exoplanet reveals extreme weather patterns, and Starlink missions push total count over 8,000 satellites.

X Report 3 Nov 2025

SpaceX completed a successful Bandwagon rideshare mission, launching a private space station pathfinder along with multiple satellites, marking another significant milestone in 2025's launch schedule.