Review Group: This material is most relevant to Aerospace Engineers, Launch Vehicle Propulsion Specialists, Mission Flight Controllers, and Orbital Mechanics Analysts.
Abstract:
This transcript documents the primary ascent milestones of the Artemis 2 mission, representing the inaugural crewed flight of the Orion spacecraft launched via the Space Launch System (SLS) from Kennedy Space Center, Florida. The sequence details the flight profile from T-minus countdown through the initial three minutes of ascent. Key telemetry events described include the vehicle reaching supersonic speeds, the management of RS-25 engine thrust during Max Q (maximum aerodynamic pressure), the planned roll maneuver for crew orientation, and the phased jettison of the five-segment Solid Rocket Boosters (SRBs) and the Launch Abort System (LAS). The transcript emphasizes the integration of Space Shuttle-heritage hardware into the SLS architecture to facilitate human exploration beyond Low Earth Orbit (LEO).
Artemis 2 Flight Profile and Ascent Sequence Analysis
00:00:11 – Liftoff and Mission Initiation: The SLS vehicle clears the pad, marking the first crewed mission of the Artemis program. This flight is designated as the first human-rated mission for the Orion spacecraft intended for trajectories beyond lower Earth orbit.
01:22 – Transonic Flight: At approximately 60 seconds into the mission, the vehicle achieves Mach 1, transitioning into supersonic flight.
01:41 – Max Q and Throttle Management: As the vehicle approaches the point of maximum aerodynamic pressure (Max Q), the RS-25 core stage engines are throttled back to reduce structural stress.
01:58 – Post-Max Q Thrust Increase: Following confirmation that the vehicle has passed Max Q, the RS-25 engines are throttled back up to 109% of their rated thrust capacity to continue the ascent.
02:07 – SRB Separation Preparation: Analysts note the upcoming separation of the two five-segment solid rocket boosters, scheduled for approximately 120 seconds into the mission.
02:31 – Roll Maneuver: The vehicle executes a planned roll maneuver. The takeaway is that this adjustment is required to establish the correct orbital inclination and ensure the crew is in the proper orientation for the duration of the "uphill" climb.
02:55 – Shuttle Heritage Integration: The five-segment SRBs are identified as hardware utilizing Space Shuttle heritage components, providing the primary thrust for the initial stage of the journey.
03:20 – Launch Abort System (LAS) Jettison: Approaching T+3 minutes, the LAS is jettisoned. Once the vehicle reaches a specific altitude and velocity, the tower is no longer required for crew extraction and is discarded to reduce vehicle mass.
03:29 – Visual Confirmation of LAS Separation: Observers report visual tracking of the launch abort tower as it tumbles away from the Orion spacecraft, indicating a clean separation.
03:55 – Sequence Reiteration: The transcript provides a secondary confirmation of the countdown and ascent milestones (Liftoff, Max Q, and LAS jettison), corroborating the timing of the initial flight phase.