SpaceX Hits 50 Launches, Falcon Heavy Scrub, X Report 28 Apr 2026
SpaceX hit 50 launches in 2026 on April 26. Falcon Heavy's ViaSat-3 mission, only its 12th flight, scrubbed on weather at Kennedy; new date pending.
ECHO (AO-51) (28375)
COSPAR: 2004-025K | Alt Name: AMSAT-OSCAR-51
Image
Additional Sources
Launch Details
Launch Date
June 29, 2004
Launch Site
Launch Pad
LC109/95
Launch Vehicle
Dnepr
Orbital Elements
NORAD ID
28375
International Designator
2004-025K
Epoch
Fri, 03 Jul 2026 20:16:30 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
98.66°
Right Ascension
149.12°
Eccentricity
Calculating...
Argument of Perigee
68.34°
Period
99.73 min
Mean Motion
14.44 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
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Velocity
Calculating...
Polar Plot
3D Visualization
Basic Satellite Info
Name
ECHO (AO-51)
Alternative Name
AMSAT-OSCAR-51
Type
Payload
Status
Non-operational
Owner
AMNA
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 28375U 04025K 26184.84479281 .00000347 00000-0 11137-3 0 9990
2 28375 98.6623 149.1160 0081263 68.3353 292.6467 14.43882662157981
Source: Celestrak
Summary
ECHO (AO-51), also known as AMSAT-OSCAR-51, is a Microsat Cube satellite operated by AMNA for amateur radio communication purposes. Launched on June 29, 2004, from the TYMSC launch site using the Dnepr launch vehicle, it has dimensions of 0.3 meters in length, diameter, and span, with a dry mass of 10 kilograms. The satellite's structure is described as having a box shape and a RCS (Radar Cross Section) value of 0.079 square meters. ECHO is equipped with solar cells and batteries for power generation. It was manufactured by SPQ and serves the mission of facilitating amateur radio communication.
Physical Characteristics
Length
0.3
Diameter
0.3
Span
0.3
Dry Mass
10
Launch Mass
10
Shape
Box
Radar Cross Section
0.079
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
AMSAT-Echo
Purpose
Amateur radio communication
Mission
Amateur radio communication
Manufacturer
SPQ
Life Expectancy
Unknown
Bus
Microsat
Configuration
Cube
Motor
None
Equipment
Unknown
Power System
Solar cells, 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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