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USA 77 (21809)
COSPAR: 1991-076E | Alt Name: USA 77
Image
Additional Sources
Launch Details
Launch Date
November 8, 1991
Launch Site
AFWTR
Launch Pad
SLC4E
Launch Vehicle
Titan 403A
Orbital Elements
NORAD ID
21809
International Designator
1991-076E
Epoch
Fri, 03 Jul 2026 23:03:01 GMT
Apogee
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Perigee
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Inclination
63.30°
Right Ascension
113.01°
Eccentricity
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Argument of Perigee
74.97°
Period
106.15 min
Mean Motion
13.57 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
USA 77
Alternative Name
USA 77
Type
Payload
Status
Unknown
Owner
NRO/NRL
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 21809U 91076E 26184.96042930 .00005719 00000-0 44648-3 0 9998
2 21809 63.2963 113.0140 0899120 74.9748 294.8921 13.56614983106546
Source: Celestrak
Summary
USA 77, also known by its OBJECT_ID 1991-076E, is a US satellite operated by NRO/NRL for ocean surveillance and ELINT (Electronic Intelligence). Launched on November 8, 1991, from AFWTR at SLC4E using the Titan 403A launch vehicle, it was manufactured by NRL. The satellite has dimensions of approximately 1 meter in length and diameter with a span of 10 meters. Its dry mass is 400 kg and its launch mass is also recorded as 400 kg. It stabilized on November 9, 1991, shortly after launch. The payload it carries is the Improved PARCAE 2 SSU-3 for enhanced mission capabilities. The satellite's shape consists of a box with an antenna attached.
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-3
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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