Sirius XM (SXM-7) - Falcon 9 (B1051.7) - CCAFS SLC-40 - 13.12.2020 17:30 UTC

Автор Alex Immortal, 02.12.2020 13:44:56

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Цитата12/11/2020 20:20 Stephen Clark

T-minus 35 minutes. Filling of the Falcon 9 rocket with super-chilled, densified kerosene and liquid oxygen is underway at Cape Canaveral. This will mark SpaceX's 25th launch of the year, and the 102nd flight of a Falcon 9 rocket since June 2010.

The liquid oxygen flowing into the first stage is chilled to near minus 340 degrees Fahrenheit (minus 206 degrees Celsius).

Propellant loading begins with pumping RP-1 kerosene into both stages of the Falcon 9 rocket, and liquid oxygen into the first stage. Liquid oxygen begins loading into the second stage at T-minus 16 minutes.

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Цитата12/11/2020 20:29 Stephen Clark

After liftoff today, the Falcon 9 will head downrange toward the east from Cape Canaveral, with the rocket's first stage booster scheduled to shut down and separate around two-and-a-half minutes into the flight.

The first stage will aim for landing on SpaceX's drone ship "Just Read the Instructions" parked a few hundred miles east of Cape Canaveral.

The Falcon 9's second stage will fire two times to place the SXM 7 spacecraft into a parking, then deploy the radio broadcasting payload into an elliptical, or egg-shaped "sub-synchronous" transfer orbit at T+plus 31 minutes, 39 seconds.

The roughly 15,000-pound, or nearly 7-metric ton, spacecraft is loaded with maneuvering propellant to boost itself toward a final perch in geostationary orbit more than 22,000 miles (nearly 36,000 kilometers). In that orbit, the spacecraft will orbit Earth at the same rate the planet rotates, giving SXM 7 a fixed view of the Americas 24 hours a day, seven days per week.



"SiriusXM, the leading audio entertainment company in the United States, will use SXM 7 to ensure continuous and reliable delivery of SiriusXM's entertainment and data services to tens of millions of subscribers across North America," Maxar said ini a statement. "SXM-7 will deliver the highest power density of any commercial satellite on-orbit, sending more than 8,000 watts of content to the continental U.S., Canada, Puerto Rico and the Caribbean, increasing the quality of signal for SiriusXM subscribers."

Once in orbit, the SXM 7 satellite -- based on Maxar's 1300-series spacecraft design -- will unfurl a large antenna reflector to broadcast radio signals to receivers on moving vehicles.

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Цитата Falcon 9 Block 5 @Falcon9Block5 1 мин. назад

T-0:20:00
Spacecraft to Internal Power

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Цитата12/11/2020 20:37 Stephen Clark

Chilldown of the strongback at pad 40 is underway to prepare for liquid oxygen loading into the Falcon 9's second stage.

Spaceflight Now members can watch a live view of the Falcon 9 rocket on pad 40 as the countdown continues toward liftoff at 12:55 p.m. EST (1755 GMT).


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Цитата12/11/2020 20:49 Stephen Clark

Hydraulics in the first and second stage Merlin engines are being activated for the Falcon 9's steering system.

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Цитата12/11/2020 20:49 Stephen Clark

T-minus 7 minutes. Prevalves leading to the Falcon 9's Merlin 1D first stage engines are opening, permitting super-cold liquid oxygen to flow into the engines to condition the turbopumps for ignition.

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Цитата12/11/2020 20:50 Stephen Clark

T-minus 5 minutes. The Falcon 9's propellant tanks are being pressurized in preparation for retraction of the strongback structure at pad 40.

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Цитата12/11/2020 20:50 Stephen Clark

T-minus 4 minutes, 15 seconds. The process to lower the strongback structure at pad 40 has begun with the opening up the cradles around the rocket. The strongback will move to an angle of around 1.5 degrees from the Falcon 9 in preparation for ignition, then further retract at liftoff.

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Цитата12/11/2020 20:52 Stephen Clark

T-minus 3 minutes and counting. The rocket's destruct system will be armed shortly, and liquid oxygen topping is being terminated soon.

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