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Artemis I Countdown 101Before the Artemis I mission launches on its way around the Moon, the launch team at Kennedy Space Center and supporting teams across the country will begin the launch countdown about two days before liftoff.

The launch countdown contains "L Minus” and "T Minus" times. "L minus" indicates how far away we are from liftoff in hours and minutes and does not include built-in holds. “T minus” time is a sequence of events that are built into the launch countdown where counting and holds are inserted.

The 730,000 gallons of propellants that will be loaded into the rocket are liquid oxygen (LO2) and liquid hydrogen (LH2).

Pauses in the countdown, or "holds," are built into the countdown to allow the launch team to target a precise launch window, and to provide a cushion of time for certain tasks and procedures without impacting the overall schedule. For the Artemis I countdown, planned built-in holds vary in length and occur at the following times: L-8 hours, 40 minutes, and L-40 minutes.
Document ID
20220004992
Acquisition Source
Kennedy Space Center
Document Type
Other - Feature story for nasa.gov on what public can expect from Artemis I countdown. Would like to release ASAP so put approve date as today, but completely understand that is likely not do-able.
Authors
Madison Elizabeth Tuttle
(Kennedy Space Center Merritt Island, Florida, United States)
Date Acquired
March 28, 2022
Publication Date
March 28, 2022
Publication Information
Subject Category
Lunar And Planetary Science And Exploration
Launch Vehicles And Launch Operations
Funding Number(s)
OTHER: NA
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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