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ECHOSTAR 21 (42749)
COSPAR: 2017-032A | Alt Name: Echostar 21
Image
Additional Sources
Launch Details
Launch Date
June 8, 2017
Launch Site
Launch Pad
LC81/24
Launch Vehicle
Proton-M/Briz-M
Orbital Elements
NORAD ID
42749
International Designator
2017-032A
Epoch
Sat, 04 Jul 2026 05:22:55 GMT
Apogee
Calculating...
Perigee
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Inclination
1.77°
Right Ascension
356.77°
Eccentricity
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Argument of Perigee
95.48°
Period
1436.11 min
Mean Motion
1.00 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
ECHOSTAR 21
Alternative Name
Echostar 21
Type
Payload
Status
Operational
Owner
ECHOM
Country
Ireland
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 42749U 17032A 26185.22425068 .00000078 00000-0 00000-0 0 9995
2 42749 1.7699 356.7678 0002456 95.4820 280.9815 1.00270784 33274
Source: Celestrak
Summary
ECHOSTAR 21 is a communication satellite launched on June 8, 2017, from Tyuratam Space Center using a Proton-M/Briz-M launch vehicle. The spacecraft measures 7.6 meters in length and has a diameter of 2.8 meters with a span of 32.4 meters due to its solar arrays. It was designed and manufactured by SSL based on the LS-1300 bus configuration, SSL-1300S model, with a dry mass of 3000 kilograms and a launch mass of 6871 kilograms. ECHOSTAR 21 is equipped with S-band transponders for communication purposes and is powered by two deployable solar arrays along with batteries. The satellite's intended operational lifetime is 15 years, and it serves the purpose of mobile satellite services (MSS). It belongs to ECHOM and carries the payload Terrestar 2. Its shape consists of a box structure complemented by two panels and a dish antenna for its mission objectives.
Physical Characteristics
Length
7.6
Diameter
2.8
Span
32.4
Dry Mass
3000
Launch Mass
6871
Shape
Box+2 panels+dish
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
Terrestar 2
Purpose
Communication (MSS)
Mission
Communication (MSS)
Manufacturer
SSL
Life Expectancy
15 years
Bus
LS-1300
Configuration
SSL-1300S
Motor
R-4D-11
Equipment
S-band transponders
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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