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NAVSTAR 23 (USA 71) (21552)
COSPAR: 1991-047A | Alt Name: GPS IIA-2
Image
Additional Sources
Launch Details
Launch Date
July 4, 1991
Launch Site
Launch Pad
LC17A
Launch Vehicle
Delta 7925
Orbital Elements
NORAD ID
21552
International Designator
1991-047A
Epoch
Wed, 01 Jul 2026 15:49:33 GMT
Apogee
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Perigee
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Inclination
56.51°
Right Ascension
352.06°
Eccentricity
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Argument of Perigee
134.62°
Period
750.55 min
Mean Motion
1.92 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 23 (USA 71)
Alternative Name
GPS IIA-2
Type
Payload
Status
Non-operational
Owner
AFSSD2
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 21552U 91047A 26182.65941149 -.00000086 00000-0 00000-0 0 9999
2 21552 56.5137 352.0599 0034449 134.6159 41.7572 1.91858562251661
Source: Celestrak
Summary
NAVSTAR 23 (USA 71), also known as GPS IIA-2, is a satellite within the GPS constellation and was launched on July 4, 1991, from Cape Canaveral Air Force Station's Launch Complex 17A using a Delta 7925 launch vehicle. It 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. The satellite features a 3-Axis stabilization system for navigation purposes and was manufactured by RWISB. With a dry mass of 860 kilograms, it carries the GPS SVN 24 payload and is powered by two deployable solar arrays along with batteries. Its mission involves providing global positioning services, and it has an expected 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
3.9045
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
GPS SVN 24
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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