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USA 74 (21799)
COSPAR: 1991-076C | Alt Name: USA 74
Image
Additional Sources
Launch Details
Launch Date
November 8, 1991
Launch Site
AFWTR
Launch Pad
SLC4E
Launch Vehicle
Titan 403A
Orbital Elements
NORAD ID
21799
International Designator
1991-076C
Epoch
Sat, 04 Jul 2026 03:31:14 GMT
Apogee
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Perigee
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Inclination
63.30°
Right Ascension
98.14°
Eccentricity
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Argument of Perigee
73.57°
Period
105.74 min
Mean Motion
13.62 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
USA 74
Alternative Name
USA 74
Type
Payload
Status
Unknown
Owner
NRO/NRL
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 21799U 91076C 26185.14669606 .00009656 00000-0 69376-3 0 9991
2 21799 63.2951 98.1408 0882245 73.5668 296.0397 13.61839634105916
Source: Celestrak
Summary
The satellite USA 74, also known as 1991-076C and cataloged under NORAD CAT ID 21799, is a US-owned spacecraft designed for ocean surveillance and ELINT (Electronic Intelligence) missions. Launched on November 8, 1991, from the AFWTR site, SLC4E launch pad using the Titan 403A vehicle, it was manufactured by NRL under the ownership of NRO/NRL. The satellite has a bus configuration designated as NOSS B SSU and is equipped with an Improved PARCAE 2 SSU-1 payload for its operational missions. It measures approximately 1 meter in length and diameter with a span of 10 meters, and its dry mass is 400 kilograms. USA 74 has a box-shaped body augmented by antennas and was stabilized by November 9, 1991, following its launch.
Physical Characteristics
Length
1
Diameter
1
Span
10
Dry Mass
400
Launch Mass
400
Shape
Box + Ant
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
Improved PARCAE 2 SSU-1
Purpose
Ocean Surveillance, ELINT
Mission
Ocean Surveillance, ELINT
Manufacturer
Naval Research Laboratory
Life Expectancy
Unknown
Bus
NOSS B SSU
Configuration
?
Motor
?
Equipment
?
Power System
Unknown
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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