Issue 137

By Jack Anthony

Editor’s Comment: Jack was nice enough to put together an article examining the upcoming Artemis 2 mission currently scheduled to launch as soon as 6 Feb 2026. Thank you again Jack! 10 Jan 2026: We are 1 week from NASA rolling out the Artemis 2 rocket (SLS) and Orion space capsule (editor’s comment: SLS rolled out to…

Editor’s Comment: Jack was nice enough to put together an article examining the upcoming Artemis 2 mission currently scheduled to launch as soon as 6 Feb 2026. Thank you again Jack!

10 Jan 2026: We are 1 week from NASA rolling out the Artemis 2 rocket (SLS) and Orion space capsule (editor’s comment: SLS rolled out to the pad on 17 Jan 2026). Launch is still planned for early February. Have you ordered your Artemis 2 hoodie on sweatshirt? I have. OK, in an effort to make you most awesome at the dinner table, in the workplace, or school, here’s a blurb on the Artemis 2 Earth orbits they will do BEFORE heading for the Moon on a free-return 3-body orbit (astro dynamos use cool words, you can too). Enjoy and whatcha think of my retro NASA attire, cool 1960’s look?


Here’s a review of the Artemis 2 orbits around the Earth before the Orion and crew head for the Moon on a Free-Return trajectory. I use altitude perigee x altitude apogee to denote low and high points of the orbit (I use Km).

Artemis 2 is launched into the RED orbit from Kennedy Space Center into a 25 km x 2200 Km orbit. Now that 25 Km low point (called perigee) is not so good, the atmosphere would cause trouble on the first perigee pass.
So Delta V#1 occurred about 45 minutes into the flight and puts Artemis 2 on the blue orbit 185 km x 2200 Km. Ahhh, much better! 
Then at Delta V#2 a big maneuver is executed to raise apogee to 70000 Km (that’s twice as high as geosynchronous satellites operate. This 185 km x 70000 Km has a 24-hr period in an elliptical orbit (egg shaped). In this orbit they will execute rendezvous and proximity operations with the Interim Cryo Propulsion Stage (ICPS) which they separate from and is tagging along in a 2 spaceship formation. They will do a bunch of orbital dancing (RPO is dancing in space, really!).

Delta V#3 is a small tweak to the perigee altitude in preparation for the Trans Lunar Insertion (TLI) that is 12 hrs away at that point. TLI is the Delta V#4 that sends Orion and crew on their way to the Moon in a free-return trajectory. That means they will reach the Moon, pass beyond it and be slung back to Earth. It’s using what astro enthusiasts call a 3-body orbit (Earth, Moon and wee little spaceship). That free return trip takes 4 days out, 4 days back. 10-day mission! Enjoy your new knowledge, so explain it to someone!



To Scale: actual Artemis 2 trajectory @peterrhague