Read live updates from launch day<\/a><\/p>\nTimelines featuring L- equate to the launch time in real time while T- equates to the countdown clock, which features built-in holds.<\/p>\n
Countdown milestones as planned for tanking:<\/p>\n
L-49 hours 50 minutes and counting<\/p>\n
L-49H50M \u2013 Launch team arrives to stations
L-49H40M \u2013 Countdown clock begins
L-49H40M \u2013 L-42H30M: Liquid oxygen (LOX)\/Liquid hydrogen (LH2) system
preparations for vehicle loading
L-45H30M \u2013 L-44H: Orion spacecraft powered up
L-42H20M \u2013 L-41H: Core stage powered up
L-42H10M \u2013 L-40H30M: Interim cryogenic propulsion stage (ICPS) powered up
L-39H45M \u2013 L-35H30M: Final preparations of the four RS-25 engines<\/p>\n
L-35 hours and counting<\/p>\n
L-34H45M \u2013 L-34H10M: ICPS is powered down
L-33H30M \u2013 L-29H30M: Charge Orion flight batteries to 100%
L-31H30M \u2013 L-24H30M: Charge core stage flight batteries
L-20H15M \u2013 L-18H45M: ICPS is powered up for launch<\/p>\n
L-16 hours and counting<\/p>\n
L-15H30M \u2013 L-14H: All non-essential personnel leave Launch Complex 39B
L-14H15M \u2013 L-12H05M: Air-to-gaseous nitrogen (GN2) changeover and rocket
cavity inerting
L-13H15M \u2013 L-11H45M: Ground launch sequencer (GLS) activation<\/p>\n
L-13 hours and counting<\/p>\n
L-12H35M \u2013 L-9H50M: 2-hour 45-minute built in countdown hold begins
L-10H50M \u2013 Launch team decides \u201cgo\u201d or \u201cno-go\u201d to begin tanking
L-10H50M \u2013 L-9H35M: Orion cold soak
L-10H40M \u2013 L-10H35M: Core stage LOX transfer line chilldown
L-10H40M \u2013 L-9H55M: Core stage LH2 chilldown
L-10H25M \u2013 L-9H40M: Core stage LOX main propulsion system chilldown<\/p>\n
L-10 hours and counting<\/p>\n
L-9H55M \u2013 L-9H25M: Core stage LH2 slow fill start
L-9H50M \u2013 Resume T-Clock from T-8H10M
L-9H40M \u2013 L-9H30M: Core stage LOX slow fill
L-9H30M \u2013 L-6H40M: Core stage LOX fast fill
L-9H25M \u2013 L-8H: Core stage LH2 fast fill
L-9H05M \u2013 L-8H30M: ICPS LH2 chilldown
L-8H30M \u2013 L-7H45M: ICPS LH2 fast fill start
L-8H \u2013 L-7H55M: Core stage LH2 topping
L-7H55M \u2013 terminal count: Core stage LH2 replenish
L-7H45M \u2013 L-7H20M: ICPS LH2 vent and relief test
L-7H20M \u2013 L-7H10M: ICPS LH2 tank topping start
L-7H05M \u2013 terminal count: ICPS LH2 replenish
L-6H40M \u2013 L-6H10M: Orion communications system activated (radio frequency to mission control)
L-6H40M \u2013 L-6H05M: Core stage LOX topping
L-6H40M \u2013 L-6H30M: ICPS LOX main propulsion system chilldown
L-6H30M \u2013 L-5H45M: ICPS LOX fast fill
L-6H10M \u2013 Stage pad rescue
L-6H10M: \u2013 Closeout crew assemble
L-6H05M \u2013 terminal count: Core stage LOX replenish<\/p>\n
L-6 hours and counting<\/p>\n
L-6H \u2013 Flight crew weather brief
L-5H45M \u2013 L-5H30M: ICPS LOX vent and relief test
L-5H30M \u2013 L-5H10M: ICPS LOX topping
L-5H10M \u2013 terminal count: ICPS LOX replenish
L-5H10M \u2013 All stages replenish
L-5H10M \u2013 Start 1-hour 10-minute built in hold
L-5H10M \u2013 L-4H55M: Closeout crew to white room
L-4H40M \u2013 L-4H10M: Flight crew deployment to pad
L-4H: Flight crew board Orion
L-3H40M \u2013 L-3H10M: Crew module hatch preps and closure
L-3H10M \u2013 L-2H45M: Counterbalance mechanism hatch sealpress decay
checks
L-2H20M \u2013 L-1H40M: Crew module hatch service panel install\/closeouts
L-1H40M \u2013 L1H30M: Launch abort system (LAS) hatch closure for flight
L-1H10M \u2013 Launch director brief \u2013 rocket & thermal protection system scan results with the imagery console
L-50M \u2013 L-40M: Closeout crew departs Launch Complex 39B
L-50M \u2013 Final NASA test director briefing is held<\/p>\n
L-40 minutes and holding\u00a0\u00a0<\/p>\n
L-40M \u2013 Built in 30-minute countdown hold begins<\/p>\n
L-25 minutes and holding\u00a0\u00a0\u00a0<\/p>\n
L-25M \u2013 Transition team to Orion to Earth communication loop following final NTD briefing
L-17M \u2013 Launch director polls team to ensure they are \u201cgo\u201d for launch
L-15M \u2013 Flight crew visors down
L-14M \u2013 Flight crew short purge verification<\/p>\n
T-10 minutes and counting\u00a0\u00a0<\/p>\n
T-10M \u2013 GLS initiates terminal count
T-8M \u2013 Crew Access Arm retract
T-6M \u2013 GLS go for core stage tank pressurization
T-6M \u2013 Orion ascent pyros are armed
T-6M \u2013 Orion set to internal power
T-5M57S \u2013 Core stage LH2 terminate replenish
T-5M20S \u2013 LAS capability is available
T-5M20S \u2013 NTD lets commander knows LAS capability is available
T-4M40S \u2013 GLS\u00a0go for LH2 high flow bleed check
T-4M30S \u2013 Flight termination system\u00a0armed
T-4M \u2013 GLS\u00a0is go for core stage\u00a0auxiliary power unit (APU)\u00a0start
T-4M \u2013 Core Stage\u00a0APU starts
T-4M \u2013 Core stage LOX\u00a0terminate replenish
T-3M30S \u2013 ICPS LOX\u00a0terminate replenish
T-3M10S \u2013 GLS go for purge sequence 4
T-2M02S \u2013 ICPS switches to internal battery power
T-2M \u2013 Booster switches to internal batter power
T-1M30S \u2013 Core stage switches to internal power
T-1M20S \u2013 ICPS enters terminal countdown mode
T-50S \u2013 ICPS LH2 terminate replenish
T-33S \u2013 GLS sends \u201cgo for automated launch sequencer\u201d command
T-30S \u2013 Core stage flight computer to automated launching sequencer
T-12S \u2013 Hydrogen burn off igniters initiated
T-10S \u2013 GLS sends the command for core stage engine start
T-6.36S\u2013 RS-25 engines startup<\/p>\n
\u00a0T-0\u00a0\u00a0<\/p>\n
Booster ignition, umbilical separation, and liftoff<\/p>\n
MISSION TIMELINE<\/p>\n
8 minutes after launch:<\/p>\n
Astronauts will be in space.<\/p>\n
Launch Day\/Flight Day 1:<\/p>\n
Once the SLS (Space Launch System) rocket\u2019s main engines cutoff, Orion and the interim cryogenic propulsion stage (ICPS) separate from the rest of rocket. The ICPS still has work to do \u2013 about 49 minutes after launch, its engine will fire to raise the perigee, or lowest point of a spacecraft\u2019s orbit, to a safe altitude of 100 miles above Earth. About an hour later, when Orion reaches that perigee, the ICPS will fire again to continue raising the spacecraft into a high-Earth orbit. The crew will then have about 23 hours to do a thorough checkout of Orion\u2019s systems while still relatively close to home.<\/p>\n
The crew will start testing systems like the potable water dispenser that will provide drinking water and rehydrate the food they brought along, the toilet, and the system that removes carbon dioxide from the air. The crewmates also can take off the orange spacesuits worn for launch and work in regular clothing. They\u2019ll spend time rearranging Orion\u2019s interior to function as a living and workspace for four floating people over the next 10 days.<\/p>\n
About three hours into the mission, NASA will test how Orion handles.<\/p>\n
On future missions, Orion will dock with other spacecraft. To verify Orion will do so safely, the ICPS will be repurposed as a docking target. It will separate from Orion, and the crew will practice flying their spacecraft toward and around it in a proximity operations demonstration. Afterward, the ICPS will fire its engines again for a disposal burn that will send it into the Pacific Ocean, and Orion will continue its high Earth orbit.<\/p>\n
After about eight-and-a-half hours in space, the astronauts will sleep for a short period. The four astronauts will be awakened after about four hours to perform an additional engine firing that will put Orion into the correct orbital geometry for its translunar injection (TLI) burn on flight day 2. They\u2019ll also take the opportunity to perform a brief check out of their emergency communications on the Deep Space Network, at the most-distant point of their high Earth orbit, which is necessary before the TLI.<\/p>\n
After this, they\u2019ll be able to go back to sleep for another four-and-a-half hours, wrapping up flight day 1.<\/p>\n
Flight Day 2<\/p>\n
Wiseman and Glover will begin their day setting up and checking out Orion\u2019s\u00a0flywheel exercise device\u00a0before getting in their first workouts of the mission. Koch and Hansen have exercise scheduled for the second half of the day. The morning workouts will provide another test of Orion\u2019s life support systems before leaving Earth orbit.<\/p>\n
Koch will spend her morning preparing for the main event of the day \u2013 the translunar injection burn. The TLI is the last major engine firing of the Artemis II mission and will set Orion on the path to the Moon. And since Orion is using a free-return trajectory to swing around the far side of the Moon, the TLI engine firing also puts Orion on the path to return to Earth on flight day 10.<\/p>\n
Koch will set up Orion\u2019s system to perform the burn, done by Orion\u2019s main engine on the spacecraft\u2019s European Service Module. Also called the orbital maneuvering system engine, it provides up to 6,000 pounds of thrust \u2013 enough to accelerate a car from 0 to 60 mph in about 2.7 seconds.<\/p>\n
Following TLI, the crew has a lighter day of activity, with time set aside to acclimate to the space environment. They\u2019ll have an opportunity to participate in a space to ground video communication \u2013 the first of several that will take place throughout the mission. With the exception of flight day 7 \u2013 the crew\u2019s off-duty day \u2013 and landing day, they are expected to have one or two of these opportunities each day of the mission.<\/p>\n
Flight Day 3<\/p>\n
The first of three smaller engine firings, called the outbound trajectory correction, will ensure Orion is staying on target for its path around the Moon and will take place on flight day 3. Hansen will prepare for the burn in the morning, which is scheduled to happen shortly after the crew\u2019s midday meal.<\/p>\n
The rest of the day will include a variety of checkouts and demonstrations. Glover, Koch, and Hansen will demonstrate CPR procedures in space; Wiseman and Glover will checkout some of Orion\u2019s medical kit, including the thermometer, blood pressure monitor, stethoscope, and otoscope.<\/p>\n
Koch has time set aside in the second half of the day to test Orion\u2019s emergency communications system on the\u00a0Deep Space Network. The entire crew will come together to rehearse the choreography for the scientific observation work they\u2019ll do on flight day 6, when Orion comes the closest to the Moon.<\/p>\n
Flight Day 4<\/p>\n
A second outbound trajectory correction burn on flight day 4 will continue to refine Orion\u2019s path to the Moon as the crew perfects some of their own preparations. They\u2019ll each have an hour devoted to reviewing the geography targets they\u2019ll be asked to get imagery of on flight day 6. Since those will vary depending on the crew\u2019s final launch time and day, this serves as an opportunity to study exactly what they\u2019ll be looking for as they draw close to the lunar surface. Although they will likely take photos and video out of Orion\u2019s windows often, flight day 4 has 20 minutes on the schedule specifically dedicated to taking photos of celestial bodies from Orion\u2019s windows.<\/p>\n
Flight Day 5<\/p>\n
Orion will enter the lunar sphere of influence on flight day 5, marking the point at which the pull of the Moon\u2019s gravity will become stronger than the pull of the Earth\u2019s gravity.<\/p>\n
As they enter the Moon\u2019s neighborhood, the crew will have a full day, with the morning almost entirely devoted to tests of their spacesuits. Officially called the\u00a0Orion crew survival system, the orange suits protect the crew during launch and reentry, but also could be used in an emergency to provide the crew member wearing it with a breathable atmosphere for up to six days if Orion depressurized. As the first astronauts to wear the new suits in space, the Artemis II crew will be testing their ability to quickly put the suits on and pressurize them; install their seats and get into them while wearing the suits; eat and drink through a port on the spacesuits\u2019 helmet; and other functions.<\/p>\n
During the crew\u2019s afternoon, the final outbound trajectory correction burn will take place before Orion\u2019s lunar flyby on flight day 6.<\/p>\n
Flight Day 6<\/p>\n
The Artemis II crew will come their closest to the Moon on flight day 6, while traveling the farthest from Earth. Artemis II could set a record for the farthest anyone has traveled from Earth depending on launch day, breaking the current record \u2013 248,655 miles away \u2013 set in 1970 by the Apollo 13 crew. The distance the Artemis II crew will travel depends on their exact launch day and time.<\/p>\n
Over the course of the day, the crew will come within 4,000 to 6,000 miles of the lunar surface as they swing around the far side of the Moon \u2013 it should look to them about the size of a basketball held at arm\u2019s length. They will devote the majority of their day to taking photos and videos of the Moon, and recording their observations as they become the first to\u00a0see some parts of the Moon\u00a0with their own eyes.<\/p>\n
Because the Sun\u2019s angle on the Moon changes by about one degree every two hours, the crew won\u2019t be sure what lighting conditions to expect on the lunar surface until they launch. If the Sun is high in the lunar sky during the flyby, there will be few shadows, and the crew will be looking for subtle variations in surface color and rightness. If the Sun is lower on the horizon, long shadows will stretch across the surface, enhancing relief and revealing depth, ridges, slopes, and crater rims that are often difficult to detect under full illumination. If the Sun is overhead from Orion\u2019s perspective \u2013 like noon on Earth \u2013 shadows will be few to nonexistent, creating ideal lighting conditions for close-up imaging of specific lunar features.<\/p>\n
The crew will record their observations in real time, as they take photos and videos \u2013 including when they lose communication with Earth for 30-50 minutes as they pass behind the Moon. That way, their observations can later be linked with the exact images they took.<\/p>\n
Flight Day 7<\/p>\n
Orion will exit the lunar sphere of influence the morning of flight day 7. Before the Artemis II crew gets too far away from the Moon, scientists on the ground, eager to hear from them while the experience is still fresh in their minds, will have time to speak with the crew.<\/p>\n
In the second half of the crew\u2019s day, the Orion engine will fire again for the first of three return trajectory correction burns that will adjust Orion\u2019s path home.<\/p>\n
The rest of the day will be largely off-duty for the crew, giving them a chance to rest before jumping back into their final tasks before their return to Earth.<\/p>\n
Flight Day 8<\/p>\n
The primary activities for flight day 8 include two Orion demonstrations.<\/p>\n
First, the crew will assess their ability to protect themselves from high radiation events like solar flares. They\u2019ll use Orion\u2019s supplies and equipment to build a shelter for cover if needed. Radiation will be an ongoing concern as humans venture into deep space, and\u00a0multiple experiments\u00a0will be aimed at collecting data on the radiation levels inside Orion.<\/p>\n
At the end of the day, the crew will try out Orion\u2019s manual piloting capability by steering the spacecraft through a variety of tasks. They\u2019ll center a chosen target in Orion\u2019s windows, move into a tail-to-Sun attitude, and perform attitude maneuvers comparing the craft\u2019s six-degree-of-freedom and three-degree-of-freedom attitude control modes.<\/p>\n
Flight Day 9<\/p>\n
Artemis II\u2019s last full day in space will kick off with prep for their return to Earth. The crew has time set aside to study their procedures for reentry and splashdown, and talk with the flight control team. Another return trajectory correction burn will ensure the spacecraft remains on target for that return.<\/p>\n
The crew will complete more demonstrations to check off their to-do list: waste collection systems in case the Orion toilet doesn\u2019t function properly and orthostatic intolerance garment fit checks. Orthostatic intolerance \u2013 which can cause symptoms such as dizziness and lightheadedness while standing \u2013 is a possibility for astronauts when they return to Earth and their bodies must readapt to the pull of gravity on their blood supply. Compression garments, worn under spacesuits, can help.<\/p>\n
The crew members will try their garments on, take body circumference measurements, and complete a questionnaire on how it fits, and how easy it is to put on and take off.<\/p>\n
Flight Day 10<\/p>\n
The last day of the Artemis II mission is focused on getting the crew safely home. A final return trajectory correction burn will ensure Orion is on the right path for splashdown, and the crew will return their cabin to its original set up \u2013 with equipment stowed and seats in place \u2013 and get back into their spacesuits.<\/p>\n
The crew module will separate from the service module, whose engines have steered them around the Moon and back to Earth. This will expose the crew module\u2019s heat shield, which will protect the spacecraft and crew as they make their way back through Earth\u2019s atmosphere and temperatures of up about 3,000 degrees Fahrenheit. Once safely through the heat of reentry, the cover that protected the spacecraft\u2019s forward bay will be jettisoned to make way for a series of parachutes to deploy \u2013 two drogue parachutes that will slow the capsule down to about 307 miles per hour, followed by three pilot parachutes that will pull out the final three main parachutes. These will slow Orion down to approximately 17 mph for a splashdown in the Pacific Ocean, where NASA and U.S. Navy personnel will be waiting for them, concluding the Artemis II mission.<\/p>\n","protected":false},"excerpt":{"rendered":"The Artemis II mission countdown timeline ahead of launch from Kennedy Space Center\u2019s Launch Pad 39-B and the…\n","protected":false},"author":2,"featured_media":215837,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[16924,114,11969,115,139,141,140,554,109,76686,1769],"class_list":{"0":"post-215836","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-orlando","8":"tag-artemis","9":"tag-latest-headlines","10":"tag-nasa","11":"tag-news","12":"tag-orlando","13":"tag-orlando-headlines","14":"tag-orlando-news","15":"tag-science","16":"tag-social","17":"tag-social-business","18":"tag-space"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/posts\/215836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/comments?post=215836"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/posts\/215836\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/media\/215837"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/media?parent=215836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/categories?post=215836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us-fl\/wp-json\/wp\/v2\/tags?post=215836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}