SpaceX’s flight-proven booster to meet its demise today, final 2017 launch

Iridium Mission 4 is go for launch aboard a reused Falcon 9

SpaceX is hours away from their 18th and final mission of 2017 one week after the successful launch of CRS-13. Currently aiming to lift off at 5:27pm from SpaceX’s Vandenberg Air Force Base launch pad, known as SLC-4E.

Fittingly, the launch of Iridium-4 will carry Iridium’s fourth batch of NEXT communications satellites to orbit aboard a flight-proven Falcon 9 booster, the same booster responsible for the launch of Iridium-2 in June 2017, capping a year of explosive growth with yet another commercial reuse. As such, Iridium-4 will become the fifth SpaceX launch of 2017 to utilize flight-proven Falcon 9s, an incredible achievement for a technology as young as commercially reusable rockets.

The fourth Iridium launch will bring the NEXT satellite constellation to the half-way point of completion. NEXT was designed and manufactured to replace Iridium’s aging first generation constellation, and will provide upgraded satellite communications, data, and more to its customers, both old and new. Additional copassenger payloads will provide an unprecedented method of commercial aircraft tracking from orbit, as well as marine vessel tracking services. Similar to their predecessors, the NEXT constellation can be realistically expected to remain operation well into the late 2030s or early 2040s.

In a truly unexpected move, SpaceX has apparently decided to expend booster 1036, meaning that the stage will not attempt a landing aboard the drone ship Just Read The Instructions after it separates from the second stage. Oddly, photos from attending photographers and SpaceX themselves revealed that the booster does nevertheless sport grid fins, and Iridium CEO Matt Desch has suggested that it will still go through the motions of recovery and soft-land in the Pacific Ocean, presumably to gather valuable performance data.

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