INMARSAT= International Mobile Satellite Organization
42698 / 17025A
15 May 2017 - 23:21 UT
Fancon-9v1.2 (9 FT #7)
Perigee / Apogee
35793 x 35795 km
Mass at launch
89 Ka-band transponders
2 deployable solar arrays
INMARSAT 5-F4 is a geostationary satellite designed to beam Internet and data transmission capacity to airline passengers, maritime crews and military personnel.
The satellite is the fourth member of Inmarsat′s broadband communications fleet, a $1.6 billion initiative named Global Xpress conceived to connect aircraft,
ships at sea, and mobile users on land through an umbrella of worldwide Ka-band beams. Each Inmarsat 5-series Global Xpress satellite carries 89 fixed and six steerable
spot beams in Ka-band. The company′s earlier satellites broadcast in L-band, but Inmarsat switched to Ka-band for the Global Xpress system, offering improved
downlink communications speeds to 50 megabits per second, with up to 5 megabits per second on the uplink side.
SpaceX launched another Falcon 9 on May 15, 2017 placing Inmarsat′s broadband communications satellite 5F4 in a supersynchronous geotransfer orbit of
385 x 70134 km x 24.5 deg. No attempt was made to recover the first stage. By Jun 1 Inmarsat 5F4 was in a 28061 x 43518 km x 0.2 deg elliptical synchronous orbit
while the Falcon 9 second stage remained in a 388 x 69831 km x 24.6 deg orbit.