Lift-off 00:37 | Solid rocket boosters separated. These rockets provided the primary thrust in the first few tens of seconds.
Lift-off 00:36 | The 100-meter SLS ignited its engines, and the ten-day Artemis II mission around the Moon is now underway. And who knows, in two years, perhaps with a landing, as currently planned for the Artemis IV mission.
If the weather holds, shortly after midnight our time, the Artemis II mission with a four-person crew could finally launch from the Florida spaceport on a journey around the Moon. People will return to a place they haven’t been for more than fifty years – since the days of Apollo – and also break the existing record for distance from Earth.
However, we don’t desire to jinx it; the launch of the super-heavy SLS rocket, which is structurally based on the famous space shuttles, has already been delayed several times due to technical complications. The weather forecast, looks quite good, and the conditions for launch meet 80% of the criteria.
Live, commented broadcast of the launch in Czech:
Free Return Trajectory
Orion consists of an American crew module and a service module supplied by Europeans. It will handle control, telecommunications, and the initial guidance of the rocket onto a free return trajectory around the Moon.
Scheme of the ten-day Artemis II mission around the Moon
As we explained in a separate article and interactive 3D simulator, Orion’s path will resemble a ballistic curve. Because it will not reach the second cosmic (escape) velocity, after being launched past the Moon, our natural satellite will miss it, the astronauts will view its far side, and literally fall back to Earth.
The free return trajectory has the advantage that, after the initial engine burn, it no longer requires significant corrections and the spacecraft cannot uncontrollably fly into deep space. Incidentally, this saved the crew of Apollo 13 in the spring of 1970.
Not Heading to the Moon Immediately After Launch
Orion will not head to the Moon immediately after launch from Cape Canaveral. The spacecraft will remain on an elongated orbit for many hours, where a lot of tests await it.
After the separation of the first stage of the SLS rocket and the connecting adapter, the Orion will still be connected to the ICPS (Interim Cryogenic Propulsion Stage) stage with its own propulsion.
Basic scheme of the super-heavy rocket carrier SLS with the Orion spacecraft
The spacecraft will detach from it, and the astronauts will face the so-called Prox Ops Demo, a test of manual Orion control, which will be important to verify its function on subsequent missions of the Artemis program with the goal of landing on the Moon no earlier than 2028.
In practice, this will happen when, after separation, Orion and ICPS will remain close to each other (they will move at the same speed around the Earth) and the crew in Orion will maneuver around it.
System Checks and Guidance to the Moon
In the next phase, the crew will thoroughly check all systems on board Orion and another engine burn will adjust its orbit around the Earth and guide it onto the TLI (Trans-Lunar Injection) trajectory, on which the actual flight to the Moon finally begins.
The Orion spacecraft for the first crewed flights to the Moon after more than fifty years
Even though Orion will move on a free return trajectory, the engines of the service module can still create minor corrections. The spacecraft will pass in front of the Moon, which will miss it, and the crew will observe its far side from a distance of 10,427 kilometers.
Orion Has No Velocity, So It Will Fall Back to Earth
The Moon’s gravity will also unhurried down Orion and help the rocket fall back to Earth. I repeat that Orion will not move at the second cosmic velocity, which is necessary for permanent escape from Earth’s gravitational field.
Simply put, it will just be “highly high” and fall like any other body. Orbit corrections only serve to ensure that the spacecraft falls correctly and does not conclude up in orbit at the end.
The crew for the Artemis II mission: Commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Koch and Jeremy Hansen (Canada)
After ten days, the crew module will discard the European service module, which will no longer be needed, and turn its heat shield towards Earth.
This will be followed by a passage through the atmosphere (this time probably faster than usual) and a landing on parachutes on the ocean surface. This phase will not differ from the same maneuvers of Crew Dragon and, decades ago, the command modules of the Apollo spacecraft.
Following the Artemis II mission (chronologically from the most recent event):
