Liftoff! Used SpaceX Rocket Launches 10 Iridium Satellites into Orbit

A used SpaceX Falcon 9 rocket launched 10 new communications satellites into orbit from California's Vandenberg Air Force Base today (March 30) in a morning liftoff that also marked an anniversary for reusable rockets.

The Falcon 9 rocket, which first flew in October 2017, launched the fifth set of Iridium Next satellites for Iridium Communications at 10:13 a.m. EDT (1413 GMT) — exactly one year to the day after SpaceX's first used Falcon 9 rocket launch and landing. Since then, SpaceX has commonly landed the first stage of its two-stage Falcon 9 rockets and reused them on later flights.

In fact, the booster that launched today's Iridium-5 mission also launched 10 other Iridium Next satellites on Oct. 9 during SpaceX's Iridium-3 mission. And last December, Iridium became the first SpaceX customer to launch a mission on a rocket it used before when the Iridium-4 mission launched with the same booster SpaceX used to launch 10 other satellites on its Iridium-2 flight in June 2017.

"Today, this is our fifth launch for the Iridium constellation, using only three rockets," SpaceX materials engineer Michael Hammersley said during live commentary.

A SpaceX Falcon 9 rocket launched 10 Iridium Next satellites from Space Launch Complex-4E at Vandenberg Air Force Base on Friday, March 30.
Credit: SpaceX

If that sounds like a lot of launches for Iridium to you, you're not wrong. Iridium has tapped SpaceX to launch 75 Iridium Next satellites to build up its communications constellation in orbit. To do that, Iridium has bought eight Falcon 9 launches for a total of $536 million.

In one departure from typical SpaceX launches, the company cut the live video feed from the Falcon 9 second stage about 9 minutes into the flight.

"Due to some restrictions from the National Oceanic and Atmospheric [Administration], NOAA for short, SpaceX will be intentionally ending live video coverage from the second stage just prior to engine shutdown," Hammersley said. "We're working with NOAA to address these restrictions in order to hopefully be able to bring you live views from orbit in the future."

Hammersley did not elaborate on what those NOAA restrictions might be. Space.com has reached out to SpaceX and NOAA for clarification.

The 10 Iridium Next satellites were scheduled to be deployed about 42 minutes after reaching orbit, bringing Iridium's constellation up to 50 satellites. SpaceX launched the first 10 Iridium Next satellites in January 2017, with three more missions following in June, October and December of that year. The entire constellation of Iridium Next satellites (which includes 66 operational satellites and nine in-orbit spares) should be in orbit by mid-2018 if SpaceX's current launch pace holds.

The Hawthorne, California-based SpaceX has regularly launched, landed and re-flown Falcon 9 rockets as part of the company's reusable-rocket program aimed at lowering the cost of spaceflight. However, SpaceX did not attempt to land the Iridium-5 booster on its offshore drone ship Just Read the Instructions. Instead, the booster was expected to fly a landing approach over the open sea in the Pacific Ocean, and then splash down.

Hammersley said SpaceX did send out its recovery boat Mr. Steven, which is equipped with a giant net held up by huge steel arms, to try to catch half of the Falcon 9 rocket's payload fairing, the protective nose cone that covers satellite payloads during launch. SpaceX CEO Elon Musk has called the boat a "catcher's mitt" in boat form.

SpaceX's first attempt to catch a Falcon 9 fairing just missed earlier this year. The company is hoping to recover payload fairings, which cost up to $6 million each, to lower the cost of its launches even more.

Today's Iridium-5 mission is not the only one on SpaceX's mind this week. Another used Falcon 9 rocket is scheduled to launch a Dragon cargo ship, which has also flown in space before, on Monday (April 2) from Cape Canaveral Air Force Station in Florida. That Dragon spacecraft will deliver fresh food, equipment and other supplies to the International Space Station once it arrives Wednesday (April 4).

Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

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