Live coverage: SpaceX swaps Falcon 9 boosters ahead of Starlink launch from Cape Canaveral Spaceflight Now – Spaceflight Now

A Falcon 9 stands ready for a Starlink mission at Cape Canaverals pad 40. File photo: Adam Bernstein/Spaceflight Now.

SpaceX is preparing to launch its first Starlink mission from Cape Canaveral Space Force Station in more than two weeks. The last time the company attempted to launch the Starlink 10-2 mission, it encountered a rare scrub as the Falcon 9s first stage Merlin engines began firing.

Liftoff of the rescheduled flight is set for 1:15 p.m. EDT (1715 UTC) from Space Launch Complex 40.

Spaceflight Now will have live coverage beginning about an hour prior to liftoff.

Activity in the tropics creates some uncertainty for the launch from a meteorological perspective. On Saturday, June 22, the 45th Weather Squadron issued a launch weather forecast that suggests just 50 percent odds of favorable launch weather at the opening of the launch window. That deteriorates to just 20 percent by the close of the window. Meteorologists are tracking cumulus clouds, anvil clouds and lightning probability as primary concerns.

Deep tropical moisture will remain entrenched across the Florida peninsula into early next week, and as a result, scattered to numerous showers and thunderstorms can be expected each day, largely favoring the afternoon and evening hours, the forecast stated.

While atmospheric flow will remain weak enough to allow daily seabreeze development, an incoming trough will likely result in delayed formation and westward progression by Monday and Tuesday, with initial storm development closer to the coast on those days.

The 24-hour back-up launch opportunity is generally the same, but the opening of the launch window is 60 percent favorable for liftoff.

The Falcon 9 first stage booster supporting this mission, B1078, will be launching for an 11th time. It previously launched the astronauts and cosmonaut of the Crew-6 mission, the USSF-124 mission and seven previous Starlink flights.

A little more than eight minutes after liftoff, B1078 will land on the SpaceX droneship, A Shortfall of Gravitas. This will be the 75th booster landing for ASOG and the 321st booster landing to date.

However, B1078 wasnt always the intended booster for this mission though. The original flight plan had B1073 as the first stage booster. However, the booster was swapped out following a last-second scrub on June 14.

SpaceX hasnt elaborated on the issue or issues that caused the scrub during engine ignition, but in a June 15 post on X (formerly Twitter), Kiko Dontchev, the vice president of Launch at SpaceX said: Tough week dealing with production challenges and then a rare scrub at engine startup yesterday on 10-2. Unfortunately there is a real issue so we need to go inspect the hardware in detail on this vehicle Painful, but safety and reliability are the priority.

This will be the 45th launch of Starlink satellites so far in 2024 with another planned for Sunday evening, which is set to launch from Vandenberg Space Force Base at 8:45 p.m. PDT (11:45 p.m. EDT, 0345 UTC).

Starlink 10-2 will add another 22 satellites to the growing megaconstellation. Following the launch, SpaceX will have launched 1,007 Starlink satellites this year alone.

According to expert orbital tracker and astronomer, Jonathan McDowell, there are more than 6,000 active Starlink satellites on orbit.

While SpaceX is preparing to launch a pair of Falcon 9 rockets on both sides of the country, in Florida, its also working with NASA and the National Oceanic Atmospheric Administration (NOAA) to launch a new weather satellite on June 25 at 5:16 p.m. EDT (2116 UTC).

NASAs Launch Services Program (LSP) contracted SpaceX to launch the final satellite in the Geostationary Operational Environmental Satellites-R (GOES-R) series. NOAA describes these as the Western Hemispheres most sophisticated weather-observing and environmental-monitoring system.

In an interview with Spaceflight Now on Friday NASAs launch director, Dr. Denton Gibson, said the launch team will be monitoring the weather over the next few days.

We have some planning to do or decisions to make in terms of when we roll the vehicle out and before we do all of our final preps for launch, Gibson said.

He said they would make a determination on whether a rollout of the Falcon Heavy rocket from the hangar to the pad would make more sense on Sunday or Monday.

The Falcon Heavy has a backup launch date of June 26, but if it slips beyond that, Gibson said there would need to be discussions with the Eastern Range before a new date could be booked.

Watch live views of the Falcon Heavy launch pad.