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BEGIN:VEVENT
SUMMARY:Atlas V 551 • Amazon Leo 154–180
DTSTART;VALUE=DATE-TIME:20251216T082800Z
DTEND;VALUE=DATE-TIME:20251216T082800Z
UID:908972698235
DESCRIPTION:A United Launch Alliance Atlas V rocket\, designated AV-111\, 
 will launch a batch of 27 operational satellites for the Amazon Leo conste
 llation. The mission is known as Leo 4 by ULA and LA-04 by Amazon. Total p
 ayload mass will be 15422kg. Atlas will deploy the satellites in an initia
 l orbit of 450km altitude\, the satellites will then use their electric pr
 opulsion systems to settle into their assigned final orbits. The Amazon Le
 o constellation will enable Internet service for customers between 56 degr
 ees north and south latitude. Atlas will fly in the 551 vehicle configurat
 ion with a five-meter medium length fairing\, five GEM-63 solid rocket boo
 sters and a single-engine Centaur upper stage.\n\nMission profile video: h
 ttps://youtu.be/ZATwTLIbQu8\n-\nOperational satellites of the Amazon Leo c
 onstellation (formerly known as Project Kuiper) are a significant upgrade 
 from the two prototype satellites of the Kuiper Protoflight mission. The ~
 572kg satellites are equipped with Hall-effect thruster technology for pro
 pulsion. They feature improved systems and sub-systems on board\, includin
 g phased array antennas\, processors\, solar arrays\, propulsion systems\,
  and optical inter-satellite links. In addition\, the satellites are coate
 d in a dielectric mirror film unique to Amazon Leo that scatters reflected
  sunlight to help make them less visible to ground-based astronomers. Amaz
 on Leo is planned to work in concert with Amazon's network of 12 satellite
  ground station facilities. In addition to connecting to ground stations\,
  satellites will interconnect via optical infrared laser connections. Amaz
 on refers to this technology as OISL (optical inter-satellite link).\nThe 
 Amazon Leo constellation is planned to consist of 3236 satellites operatin
 g in 98 orbital planes in three orbital shells\, one each at 590km\, 61
 0km and 630km orbital altitude. Kuiper satellites will fly in mid-inclinat
 ion orbits\, enabling Internet service for customers between 56 degrees no
 rth and south latitude. Phase 1 of deployment will be 578 satellites at 63
 0km altitude and an orbital inclination of 51.9 degrees. A total of five p
 hases of constellation development are planned.\n-\nDelayed from Dec. 15.\
 n\nWebcast: https://www.youtube.com/live/8sUGNYmYjR4\nhttps://www.ulalaun
 ch.com/missions/next-launch/atlas-v-amazon-leo-4\nhttps://youtu.be/gZRQWww
 x4u8\nhttps://spaceflightnow.com/2025/12/15/live-coverage-ula-atlas-5-laun
 ch-will-put-amazons-180th-broadband-satellite-in-low-earth-orbit/\nhttps:/
 /www.youtube.com/live/DMKIoVHNufM\nhttps://www.youtube.com/live/e5jbpeBXvp
 I\nhttps://www.youtube.com/live/W0eppNZfgYE\nhttps://www.youtube.com/live/
 kqaZ1azWlhQ\nhttps://x.com/i/broadcasts/1nAKEEyajbvKL
LOCATION:Cape Canaveral AFS Launch Complex 41\, Titan III Rd\, Titusville\
 , FL 32780\, USA
END:VEVENT
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