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SpaceX All Set to Launch Today Heaviest INMARSAT 4th Communication Satellite

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SpaceX is all set to launch heaviest ever Inmarsat fourth communications satellite (Photo: SpaceX)

SpaceX is launching its sixth Falcon 9 rocket in 2017 with Inmarsat-5 F4 communications satellite into orbit but not attempting recovery of the used rocket after its takeoff as it was hard to land the rocket after launch.

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Inmarsat-5 F4 measures bigger than a double-decker bus and weighs nearly 13,500 pounds, making it the heaviest single probe ever lifted off and meant for a very high orbit called Geostationary Transfer Orbit which is 22,000 miles above the Earth’s surface.

As the Falcon 9 requires huge propellant during launch to get the satellite in its orbit, little fuel will be leftover for a re-entry mission. The satellite INMARSAT-5 F4 will join three additional I-5 probes already in orbit, making up the Global Xpress constellation for Inmarsat.
The INMARSAT satellites provide high-speed, mobile broadband service to airliners, ships, and other communication users.

The launch tonight is scheduled to take off around 7:20PM ET from pad 39A at NASA’s Kennedy Space Center in Florida, with a 49-minute launch window. If it has to be scrubbed off, then the next window for is tomorrow at 7:21PM ET.

The Launch Complex 39A at NASA’s Kennedy Space Center has a long history dating back to the early 1960s when it supported the Apollo program, the first Saturn V launch (Apollo 4), and many subsequent Apollo missions, including Apollo 11 in July 1969. In the late 1970s, LC-39A was modified to support Space Shuttle launches from 1981 to 2011.

In 2014, SpaceX signed a 20-year lease with NASA to use the Launch Complex 39A and upgraded the pad’s structures and ground systems to support launches of both commercial and crew missions on SpaceX’s Falcon 9 and Falcon Heavy launch vehicles.

Mission Timeline: (approximate)

COUNTDOWN

Hour/Min/Sec Events
– 01:13:00 Launch Conductor takes launch readiness poll
– 01:10:00 RP-1 (rocket grade kerosene) loading underway
– 00:45:00 LOX (liquid oxygen) loading underway
– 00:07:00 Falcon 9 begins engine chill prior to launch
– 00:02:00 Range Control Officer (USAF) verifies range is go for launch
– 00:01:30 SpaceX Launch Director verifies go for launch
– 00:01:00 Flight computer commanded to begin final prelaunch checks
– 00:01:00 Propellant tank pressurization to flight pressure begins
– 00:00:03 Engine controller commands engine ignition sequence to start
– 00:00:00 Falcon 9 liftoff

LAUNCH AND SATELLITE DEPLOYMENT

Hour/Min/Sec Events
00:01:17 Max Q (moment of peak mechanical stress on the rocket)
00:02:45 1st stage engine shutdown/main engine cutoff (MECO)
00:02:49 1st and 2nd stages separate
00:02:56 Second stage engine starts
00:03:35 Fairing deploy
00:08:38 2nd stage engine cutoff (SECO-1)
00:26:59 2nd stage engine restarts
00:27:55 2nd stage engine cutoff (SECO-2)
00:31:48 Inmarsat-5 F4 satellite deploy

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