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NAVSTAR 55 (USA 178) (28361)
COSPAR: 2004-023A | Alt Name: GPS IIR-12
Image
Additional Sources
Launch Details
Launch Date
June 23, 2004
Launch Site
Launch Pad
SLC17B
Launch Vehicle
Delta 7925-9.5
Orbital Elements
NORAD ID
28361
International Designator
2004-023A
Epoch
Fri, 03 Jul 2026 08:30:20 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
54.87°
Right Ascension
86.06°
Eccentricity
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Argument of Perigee
302.44°
Period
718.00 min
Mean Motion
2.01 rev/day
Latitude
Calculating...
Longitude
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Altitude
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Velocity
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Polar Plot
3D Visualization
Basic Satellite Info
Name
NAVSTAR 55 (USA 178)
Alternative Name
GPS IIR-12
Type
Payload
Status
Backup
Owner
AFSMC
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 28361U 04023A 26184.35440852 -.00000013 00000-0 00000-0 0 9996
2 28361 54.8745 86.0584 0159616 302.4425 244.0444 2.00557767161362
Source: Celestrak
Summary
NAVSTAR 55 (also known as GPS IIR-12) is a US satellite launched on June 23, 2004, from Cape Canaveral Air Force Station's SLC17B launch pad using the Delta 7925-9.5 launch vehicle. It belongs to the Series 4000 with configuration AS-4000 and is manufactured by LMMS for navigation purposes. The satellite has dimensions of 1.5 meters in length, 1.9 meters in diameter, and a span of 19.3 meters. It weighs 1077 kg at launch and has a dry mass of 910 kg. Equipped with two deployable solar arrays and batteries for power supply, the satellite uses Star 37XFP motors. Its shape is described as Box + 2 Pan, and it has an RCS (reflectivity) value of 3.2117. NAVSTAR 55 was designed to operate for a decade as part of the GPS SVN 60 payload managed by AFSMC.
Physical Characteristics
Length
1.5
Diameter
1.9
Span
19.3
Dry Mass
910
Launch Mass
1077
Shape
Box + 2 Pan
Radar Cross Section
3.2117
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
GPS SVN 60
Purpose
Navigation
Mission
Navigation
Manufacturer
LMMS
Life Expectancy
10 years
Bus
Series 4000
Configuration
AS-4000
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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