SpaceX successfully completes two Falcon 9 landings in one weekend


SpaceX has successfully launched and landed the second Falcon 9 rocket in roughly 48 hours — giving SpaceX two wins in its “weekend doubleheader.” The nearly back-to-back launches are a show of strength for the company that has said it intends to up the pace of its launches.

The rocket took off today from California’s Vandenberg Air Force Base at 1:25 PM Pacific Time, and launched 10 satellites for the communications company Iridium. It’s the company’s ninth launch of 2017, and, six months in, are the most completed by SpaceX in a single year.

The rocket’s 230-foot-tall first stage, which houses nine engines, then touched down on the drone ship called “Just Read the Instructions” floating in the Pacific Ocean. Musk warned earlier in the day that the landing might be tricky, and weather conditions were described as borderline.

Nevertheless, today marks SpaceX’s lucky 13th successful landing overall, and its eighth at sea. In fact, SpaceX hasn’t lost a rocket during an attempted landing since early last summer — today’s leaves their landing streak at nine. That’s a big deal, because being able to consistently land the Falcon 9’s first stages means SpaceX can reuse them. Refurbishing used rockets — which otherwise can cost tens or even hundreds of million dollars to custom-build for each mission — is key to cutting launch costs.

Today’s Falcon 9 was a new one sporting larger, upgraded titanium hypersonic grid fins. SpaceX founder and CEO Elon Musk tweeted that these are made out of a single piece of cast and cut titanium, and that they can withstand the heat of reentry without shielding.

The launch of 10 Iridium satellites to low Earth orbit brought Iridium’s satellite count up to 20. That’s more than a quarter of the way to the planned 75-satellite constellation intended to boost phone and data coverage worldwide, and enable better aircraft tracking. The satellites are expected to deploy an hour after launch, and this post will be updated when we know whether the deployment was successful.

The back-to-back launches are the closest together so far for SpaceX, which launched a refurbished Falcon 9 booster just over 48 hours ago on Friday at Florida’s Kennedy Space Center. The reused rocket had previously delivered the first 10 Iridium satellites into orbit. On Friday, it sent Bulgaria’s first communications satellite to space, and the rocket’s first stage then landed on the “Of Course I Still Love You” droneship in the Atlantic. It was the second eversuccessful landing of a reused rocket — but it was a little bumpy. Musk tweeted:

SpaceX hadn’t planned for this weekend to be quite so busy. Friday’s launch was originally scheduled for last weekend, but it was scrubbed so a problematic valve could be replaced in the cone that holds the satellite (called the fairing). But the increased pace doesn’t seem to have harmed SpaceX’s track record of successful landings — and this weekend’s doubleheader is an early sign that SpaceX may be able to live up to its goal of more frequent launches.


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