May 5, 2024

NASA Artemis I – Flight Day 18: Orion Spacecraft Re-enters Lunar Sphere of Influence

A cam mounted on among Orions four solar selections captured this image of the Earth on flight day 17 of the 25.5-day Artemis I mission from a distance of more than 222,000 miles (357,000 km). Orion has exited the far-off lunar orbit and is heading for a December 11 splashdown in the Pacific Ocean. Credit: NASA
Although the crew module thrusters will be evaluated a couple of days prior to Orions splashdown in the world, their primary function happens in the final hour before splashdown in the Pacific Ocean. After the team module and service module different, the team modules RCS thrusters will be utilized to guarantee the spacecraft is correctly oriented for re-entry, with its heat guard pointed forward, and stable throughout descent under parachutes.
Orion will be out of interaction with NASAs Deep Space Network for about 4.5 hours from 7:40 p.m. CST to 12:00 a.m. while network groups reconfigure ground stations. The flight control group has changed the activity timeline, and there is no effect on the missions trajectory. Automated commands will guide the spacecraft throughout this duration, and Orion will reacquire signal as it passes within variety of the Canberra ground station.
Simply after 4:30 p.m. CST on December 3, Orion was traveling 221,630 miles (356,679 km) from Earth and 40,086 miles (64,512 km) from the Moon, cruising at 2,777 miles per hour (4,469 k/h).

An electronic camera mounted on one of Orions 4 solar ranges caught this image of the Moon on flight day 17 of the 25.5-day Artemis I objective from a distance of more than 222,000 miles (357,000 km) from Earth. Orion has left the distant lunar orbit and is heading for a December 11 splashdown in the Pacific Ocean. On Flight Day 18 of NASAs Artemis I mission, Orion returned to the lunar sphere of influence at 4:45 p.m. CST on Saturday, December 3. A camera installed on one of Orions four solar varieties recorded this image of the Earth on flight day 17 of the 25.5-day Artemis I objective from a distance of more than 222,000 miles (357,000 km).

An electronic camera mounted on one of Orions four solar selections captured this picture of the Moon on flight day 17 of the 25.5-day Artemis I objective from a range of more than 222,000 miles (357,000 km) from Earth. Orion has actually left the remote lunar orbit and is heading for a December 11 splashdown in the Pacific Ocean. Credit: NASA
On Flight Day 18 of NASAs Artemis I objective, Orion re-entered the lunar sphere of impact at 4:45 p.m. CST on Saturday, December 3. This means that the Moon is now the main gravitational force acting upon the spacecraft. Entry into the lunar sphere of entry occurred when the spacecraft was around 39,993 miles (64,362 km) from the lunar surface. It will exit the lunar sphere of influence for a last time on Tuesday, December 6, one day after the return powered flyby about 79 miles (127 km) above the lunar surface area.
Engineers likewise carried out a development flight test objective that altered the minimum jet firing time for the reaction control thrusters over a period of 24 hours. This test objective is designed to exercise the reaction control system jets in a pre-planned series to model jet thruster firings that will be included into the crewed Artemis II objective.
The test utilized the reaction control system (RCS) thrusters, developed by ArianeGroup, on the European Service Module. All shootings of RCS thrusters throughout the flight test to date have actually utilized those on the service module. There are an additional 12 RCS thrusters, constructed by Aerojet Rocketdyne, that are situated on the crew module.