In its fourth flight in a series of eight for Iridium Communications, a SpaceX Falcon 9 rocket will launch the next ten satellites in the Iridium NEXT communications satellite constellation. The constellation allows air or ground users to communicate from and to any point on Earth.

The launch date was Saturday, December 23, 2017 at 1:27 AM (UTC).

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Provider	SpaceX
Vehicle	Falcon 9
Location	SLC-4E Vandenberg SFB California, United States
All dates and times should be submitted in UTC timezone. Use Estimated Date if you don't know the official launch date and time; otherwise, use Window Opens/Closes and/or Planned T-0, which will override the Estimated Date.
— Estimated Date —
Date
— Window Opens —
Date
Time
Launch Date	Saturday, December 23, 2017
Launch Time	1:27 AM (UTC)
Launch Time (Pad)
— Planned T-0 —
Date	Saturday, December 23, 2017
Time	1:27 AM (UTC)
— Window Closes —
Date	Saturday, December 23, 2017
Time	1:27 AM (UTC)
COSPAR ID	2017-083

Part of a series of launches:

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B1036

Communications Satellite

Expendable

Flight-Proven Booster

Polar Orbit

Series: Iridium NEXT

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Full Iridium-4 Broadcast (SpaceX)
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Iridium NEXT (Iridium-4, 31-40)

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