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NAVSTAR 39 (USA 128) (24320)
COSPAR: 1996-056A | Alt Name: GPS IIA-18
Image
Additional Sources
Launch Details
Launch Date
September 12, 1996
Launch Site
Launch Pad
LC17A
Launch Vehicle
Delta 7925
Orbital Elements
NORAD ID
24320
International Designator
1996-056A
Epoch
Wed, 01 Jul 2026 14:31:02 GMT
Apogee
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Perigee
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Inclination
53.71°
Right Ascension
236.28°
Eccentricity
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Argument of Perigee
217.41°
Period
772.12 min
Mean Motion
1.86 rev/day
Latitude
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Longitude
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Altitude
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Velocity
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Polar Plot
3D Visualization
Basic Satellite Info
Name
NAVSTAR 39 (USA 128)
Alternative Name
GPS IIA-18
Type
Payload
Status
Non-operational
Owner
AFSMC
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 24320U 96056A 26182.60488942 .00000046 00000-0 00000-0 0 9997
2 24320 53.7062 236.2753 0031355 217.4117 141.3969 1.86499083210772
Source: Celestrak
Summary
NAVSTAR 39 (USA 128), also known as GPS IIA-18, is a satellite in the Global Positioning System launched on September 12, 1996, from Launch Complex 17A at Cape Canaveral Air Force Station using a Delta 7925 launch vehicle. The spacecraft has dimensions of 2.4 meters in length, 1.8 meters in diameter, and a span of 5.3 meters when its solar arrays are deployed. It weighs 860 kilograms both at launch and dry mass. The satellite uses two deployable solar arrays along with batteries for power generation. NAVSTAR 39 is equipped with GPS SVN 30 as its payload to provide navigation services and operates on a 3-axis stabilized configuration. Its manufacturer is RWISB, and it was owned by AFSMC during its operational lifetime of approximately 7.5 years.
Physical Characteristics
Length
2.4
Diameter
1.8
Span
5.3
Dry Mass
860
Launch Mass
860
Shape
Box + 2 Pan
Radar Cross Section
3.1622
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
GPS SVN 30
Purpose
Navigation
Mission
Navigation
Manufacturer
RWISB
Life Expectancy
7.5 years
Bus
GPS IIA
Configuration
3-Axis stabilized
Motor
Star 37XFP
Equipment
?
Power System
2 deployable solar arrays, batteries
ADCS
Unknown
Transmitter Frequency
Unknown
Map
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration
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