X Report 27 Feb 2025
SpaceX's Falcon 9 rockets propel space exploration and connectivity forward with a moon landing mission, Starlink deployment, and readiness for another Starship launch trial.
USA 4 (15226)
COSPAR: 1984-091A | Alt Name: USA 4
Image
Additional Sources
Launch Details
Launch Date
August 28, 1984
Launch Site
AFWTR
Launch Pad
SLC4W
Launch Vehicle
Titan 34B
Orbital Elements
NORAD ID
15226
International Designator
1984-091A
Epoch
Sun, 28 Jun 2026 01:19:27 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
63.13°
Right Ascension
84.29°
Eccentricity
Calculating...
Argument of Perigee
282.84°
Period
717.54 min
Mean Motion
2.01 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
Basic Satellite Info
Name
USA 4
Alternative Name
USA 4
Type
Payload
Status
Unknown
Owner
NRO/SAFSP
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 15226U 84091A 26179.05517668 -.00000145 00000-0 00000-0 0 9992
2 15226 63.1300 84.2902 6574217 282.8383 15.7553 2.00685992 50936
Source: Celestrak
Summary
USA 4, also known by its OBJECT_ID 1984-091A, is a communication satellite launched on August 28, 1984, from AFWTR SLC4W using the Titan 34B launch vehicle. It was manufactured by HSES and operated under NRO/SAFSP ownership. The satellite uses an HS-350 bus configuration and carries the payload QUASAR 5 (or JUMPSEAT 7). With a length of 7 meters, diameter of 2.4 meters, and span of 7 meters, USA 4 has a dry mass of 650 kilograms and was launched with a total mass of 800 kilograms. Its power system includes body-mounted solar cells and batteries. The satellite's shape is described as cylindrical with two dish antennas attached.
Physical Characteristics
Length
7
Diameter
2.4
Span
7
Dry Mass
650
Launch Mass
800
Shape
Cyl + 2 Dish
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
QUASAR 5 (or JUMPSEAT 7)
Purpose
Communication
Mission
Communication
Manufacturer
HSES
Life Expectancy
Unknown
Bus
SDS
Configuration
HS-350 bus ?
Motor
?
Equipment
?
Power System
Solar cells (body mounted), batteries
ADCS
Unknown
Transmitter Frequency
Unknown
Map
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.
SpaceX Wins $178.5M Space Force Missile Tracking Contract | KeepTrack Space Brief
SpaceX awarded $178.5M Space Force contract for missile tracking satellite launches beginning 2027. Pentagon also extends GPS modernization support with $45M Raytheon order.
The Space Station Space Race
As the International Space Station nears retirement, private companies are stepping up to fill the void with their own space stations. Discover the key players and the potential impact on space exploration.
X Report 22 Sep 2025
SpaceX successfully launched 28 Starlink satellites from Florida, marking another milestone for their ongoing deployment efforts.
Block 3 Starship Pad Work Accelerates at Starbase | KeepTrack X Report
SpaceX engineers are overhauling Starbase launch infrastructure for Block 3 Starships as Falcon 9 prepares another Starlink batch run.
The Looming Crisis of Orbital Debris
As humanity increasingly relies on satellites, the escalating space junk problem poses a dire threat to our space-based infrastructure. With debris counts reaching alarming levels, urgent action is needed to prevent a cascade of collisions that could make key orbits unusable.
SpaceX to Launch 11,000th Starlink Satellite, Crew-12 Moved Up to Feb 11 | KeepTrack X Report
SpaceX set to launch 11,000th Starlink satellite on Starlink 17-19 from Vandenberg. NASA moves Crew-12 launch to Feb 11 after ISS medical evacuation. Starship V3 targets mid-March first flight.
X Report 25 Jan 2025
SpaceX advances Starship infrastructure, President Trump considers closing the National Space Council, and 23 new Starlink satellites boost global connectivity.