Launch Date
January 11, 1964
Launch Site
AFWTR
Launch Pad
75-3-5
Launch Vehicle
Thor SLV-2A Agena D
NORAD ID
00731
International Designator
1964-001E
Epoch
Sat, 04 Jul 2026 02:50:18 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
69.90°
Right Ascension
230.70°
Eccentricity
Calculating...
Argument of Perigee
355.06°
Period
103.13 min
Mean Motion
13.96 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Name
GREB
Alternative Name
GREB
Type
Status
Owner
NRO/NRL
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
1 00731U 64001E 26185.11826743 .00000023 00000-0 56024-4 0 9992
2 00731 69.9046 230.6973 0013865 355.0550 5.0416 13.96312191179945
Source: Celestrak
Apologies, there is no summary for this satellite yet. I am working to generate these for every object in the catalog, but it is going to take time.
Length
0.5
Diameter
0.5
Span
0.5
Dry Mass
29
Launch Mass
29
Shape
Sphere
Radar Cross Section
0.5096
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Payload
POPPY 3 Alfa
Purpose
SIGINT
Mission
SIGINT
Manufacturer
Naval Research Laboratory
Life Expectancy
ca. 34 month (average)
Bus
NRL 20
Configuration
NRL 20in sphere
Motor
None
Equipment
Unknown
Power System
Solar cells, batteries
ADCS
Unknown
Transmitter Frequency
Unknown
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