ULA SES-20 & SES-21 Atlas V 531
Rocket Launch Video Stream
Weather Forecast During Launch
According to weather officials, there's a 90% chance of favorable weather conditions at the time of the launch.
Rocket Launch Trajectory & Flight Path
Track the complete rocket launch trajectory with real-time flight data from FlightClub.io (opens in a new tab). View detailed telemetry including rocket velocity, altitude progression, thrust levels, acceleration, orbital insertion parameters, and 3D flight path visualization throughout all mission phases from liftoff to orbit.
Learn about rocket launch trajectory physics (opens in a new tab)
About the SES-20 & SES-21 Mission
| Type | Communications |
|---|---|
| Orbit | Geostationary Orbit |
| Launch Cost | $140,000,000 |
SES-20 & SES-21 are a pair of C-band communication satellites built by Boeing, using the highly efficient all-electric propulsion BSS-702SP satellite bus.
These satellites will enable SES to clear 280MHz of mid-band spectrum for 5G use while seamlessly migrating SES’s existing C-band customers and ensuring the continued delivery of digital television to nearly 120 million American TV homes and other critical data services.
Launch Pad & Location
Space Launch Complex 41
Cape Canaveral SFS, FL, USA
| Launches | 125 |
|---|---|
| Orbital Launch Attempts | 125 |
| Total Launches | 1130 |
Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida.
ULA Atlas V 531 Rocket
Atlas V with 5m Fairing, 3 SRB, 1 Centaur upper stage engine.
| Length | 60.0 m |
|---|---|
| Diameter | 3.8 m |
| Stages | 2 |
| Launch Mass | 479.0 T |
| Apogee | 40,000.0 km |
| LEO Capacity | 15,530 kg |
| GTO Capacity | 7,450 kg |
| GEO Capacity | 3,080 kg |
| Launch Cost | $140,000,000 |
| Maiden Flight | 8/14/2010 |
About ULA
United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg.
| Total Launches | 175 |
|---|---|
| Successful | 175 |
| Pending | 73 |
| Consecutive Success | 175 |
Frequently Asked Questions
When was the ULA Atlas V 531 SES-20 & SES-21 launch scheduled?
The ULA Atlas V 531 SES-20 & SES-21 launch was scheduled for:
.
Where can I watch the ULA Atlas V 531 SES-20 & SES-21 launch video?
You can watch the ULA Atlas V 531 launch video on this page. The official video includes full mission coverage with multiple camera angles, onboard views, and expert commentary covering pre-launch procedures, liftoff, stage separation, and payload deployment.
Where did the ULA Atlas V 531 SES-20 & SES-21 mission launch from?
The ULA Atlas V 531 rocket launched from Space Launch Complex 41 at Cape Canaveral SFS, FL, USA. Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida.
What rocket was used for the SES-20 & SES-21 mission?
The SES-20 & SES-21 mission launched aboard a ULA Atlas V 531 rocket. Atlas V with 5m Fairing, 3 SRB, 1 Centaur upper stage engine. Detailed rocket specifications and performance data are available in the rocket details above.
What weather conditions could have delayed the ULA Atlas V 531 SES-20 & SES-21 launch?
The ULA Atlas V 531 SES-20 & SES-21 launch could have been delayed by various weather conditions including lightning within 10 nautical miles, high winds (especially upper-level winds), thick cloud layers, precipitation, and poor visibility. Weather must be favorable at the launch site, downrange landing zones, and abort landing sites.
How can I get updates if the ULA Atlas V 531 SES-20 & SES-21 launch was delayed?
This page was updated in real-time with the latest ULA Atlas V 531 launch status, including any delays or scrubs for the SES-20 & SES-21 mission. You can also check our space launch schedule for historical launch information. Our mobile app provides push notifications for instant alerts about launch status changes. Official ULA live streams provided the most immediate range updates during the launch window.
Last Updated
Last Updated:
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Launch success
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Liftoff
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Coverage live
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Weather 90%
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Weather 80%
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Weather 70%
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Delayed to Oct 4th due to Hurricane Ian
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Weather 20%
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Added launch time
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NET September 30
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Late September
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NET September
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NET August 2022