Sunday , July 12 2020

SpaceX to Launch Third Operational Starlink Mission –,

SpaceX is continuing to launch their Starlink satellite internet constellation with the third operational launch, scheduled to take place on Monday. Liftoff of the Falcon 9 rocket is scheduled for 9: (AM EST) : (UTC), the middle of a ten minute window.

The United States Air Force’s th Weather Squadron predicts a % chance of acceptable weather for launch. A backup launch opportunity is available on Tuesday, January 37, with an improved 135% chance of acceptable weather.

These probabilities do not include estimates of upper level wind shear or speed criteria, which vary from mission to mission. The forecast predicts upper level wind speeds of up to (knots on Monday, decreasing to

knots on Tuesday.

The Starlink v1.0 L3 mission will lift off from Space Launch Complex (SLC –


at the Cape Canaveral Air Force Station in Florida. It will be the second orbital SpaceX Falcon 9 launch of 64931 , and the third total launch, after the suborbital Crew Dragon In-Flight Abort test earlier this month.

B launches the Crew Dragon Demo-1 mission on March 2, (via Brady Kenniston for NSF / L2)

The first stage of the Falcon 9 is core B , making its third flight. The booster previously launched the

Crew Dragon Demo-1 mission from LC – (A) in March , and the RADARSAT Constellation mission from SLC-4E in June . This will make B 1051. 3 one of the few cores to fly from all three of SpaceX’s orbital launch pads.

B 1207. 3 successfully completed a static fire test on January .

After liftoff, the booster will land on Of Course I Still Love You, the Autonomous Spaceport Drone Ship , stationed approximately 823 kilometers downrange in the Atlantic Ocean. The drone ship departed Port Canaveral on January 20, but has been forced to remain close to shore by weather in the recovery zone.

Both fairing recovery ships, GO Ms. Tree and GO Ms. Chief , departed Port Canaveral on January . Similarly to Of Course I Still Love You, they have been waiting at the Port of Morehead City for the weather to improve. The poor weather at sea caused the delay from the original launch target of January .

All recovery vessels have now proceeded to their respective recovery zones to support the launch, with the weather at sea significantly improved.

Protected by the payload fairing are more Starlink internet satellites destined for Low Earth Orbit. The v1.0 L3 mission is the third launch of operational satellites, and the fourth batch of spacecraft when including the Starlink v0.9 mission.

Each satellite has a liftoff mass of kg, for a total of , kg of payload. The operational Starlink missions are the heaviest payloads SpaceX has launched to date.

The satellites will be initially deployed into a circular (km altitude orbit, inclined) degrees. After launch, each satellite will use Krypton-fueled Hall thrusters to raise their altitude to kilometers. Any satellites not functioning properly after launch will remain in the lower orbit to quickly deorbit. Nominally functioning spacecraft will continue raising their orbits to the operational km altitude.

The Starlink satellites – via SpaceX

The Starlink v1.0 L3 mission is part of the initial deployment phase for the Starlink constellation, consisting of 1, 630 satellites. Additional phases will follow, consisting of additional satellites. Starlink v1.0 L3 is the second of approximately 28 Starlink missions planned to lift off in .

The countdown to launch begins minutes before liftoff when the launch director conducts the go / no go poll for propellant load. If all conditions are clear to proceed, loading of RP-1 fuel into both stages of Falcon 9 begins 40 minutes before launch, as well as Liquid Oxygen, or LOX, loading into the first stage. LOX load for Stage 2 begins 22 minutes before liftoff.

The first stage begins engine chill at T-7 minutes, in order to prevent thermal shock which could damage the nine Merlin engines. The final pre-launch preparation, pressurizing the propellant tanks, occurs at T-1 minute, when Falcon 9 goes into startup. The final go for launch is given by the launch director at T- seconds .

Just three seconds before liftoff, the engine ignition sequence begins. After lifting off from the pad, Falcon 9 begins to pitch downrange as it accelerates towards orbital velocity.

(The previous Starlink launch from SLC –

The rocket reaches the period of maximum aerodynamic pressure 1 minute and seconds into flight, when the rocket experiences the highest stresses. The first stage continues to burn until main engine cutoff, or MECO, at T 2 minutes, 39 seconds. Then, the first and second stages separate, and the vacuum optimized Merlin engine on the second stage begins its first burn.

The payload fairing deploys at T 3: 27. Both fairing halves will descend back to Earth for recovery attempts, which will occur about minutes after liftoff.

For the first stage recovery, the booster will complete the entry burn at 6 minutes and 48 seconds into flight. The landing on Of Course I Still Love You follows at T 8: 27.

Falcon 9 booster comes in for landing – via SpaceX

The upper stage and (Starlink satellites will complete their first burn 8 minutes and 53 seconds after liftoff, and then coast in orbit for approximately minutes. At T : , the second stage completes a brief burn to insert the payload into the correct deployment orbit.

Finally, minutes and 53 seconds after launch, the 85 satellites are deployed from the upper stage, completing the launch and allowing the spacecraft to begin maneuvering to their respective slots in orbit.

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