Artemis Moon Landing: A New Estimate Emerges for Starship Launch Count

During a quarterly meeting of the NASA Aerospace Safety Advisory Panel, a new estimate was provided for the number of SpaceX Starship launches required to fuel a lunar lander for a mission to the Moon. The figure, discussed by panel member and former NASA astronaut Charlie Precourt, stands at 22 launches. This number is part of a broader discussion on risks associated with the Artemis Program, which aims to land humans on the Moon.

This estimate, discussed during the panel's quarterly meeting, represents a significant escalation from previous figures. For years, the required number of Starship launches has been a closely guarded and shifting metric. NASA officials have historically declined to provide a specific number, citing the evolving nature of the hardware and mission plans. In 2023, for example, the then-director of NASA's Human Landing System, Lisa Watson-Morgan, stated, “We have a general idea, but I’m reluctant to say exactly what that is.”

The rationale for the launch count is rooted in the architecture of the mission itself. The plan involves a 'depot' Starship in low-Earth orbit, which would be filled with liquid oxygen and methane propellant by a series of 'tanker' Starships. Once fully loaded, the depot could then fuel the lunar lander for its journey. The number of tanker flights required to achieve this has been the subject of speculation and internal estimates for some time.

Past figures from officials have varied. One estimate placed the number in the “high single digits to the low double digits,” suggesting approximately a dozen launches. Other officials have mentioned figures in the “high teens.” The underlying assumption has always been that improvements to Starship's lift capacity would reduce the number of tanker flights needed to prepare a lunar mission.

The emergence of a figure as high as 22 launches has raised concerns among some NASA officials. The core issue is whether SpaceX can improve Starship's performance quickly enough to make it a viable component for NASA's Artemis program this decade. The large number of launches required to simply fuel a single lander is viewed as a significant operational hurdle.

The process would necessitate a rapid and precise sequence of launches. A depot Starship would need to be placed in orbit, followed by a continuous stream of tanker flights to fill it with propellant. Only after this complex orbital refueling operation could the lunar lander be fueled for its voyage, a sequence that adds considerable time and complexity to the mission.

This discussion of risk is a regular function of the Aerospace Safety Advisory Panel, which advises NASA on safety and technical issues. The panel's role is to identify potential problems in the agency's programs. The focus on the Starship launch count highlights a specific area of concern regarding the feasibility and timeline of the Artemis mission architecture.

The number of launches is a critical factor in determining the viability and timeline of the Artemis mission. A high launch count would increase the complexity, cost, and potential for delays in preparing for a lunar mission. The conversation around this metric is a direct reflection of the challenges involved in executing a mission of this scale.

The source material does not specify when the 22-launch estimate would be required or provide further context on the timeline for achieving such a launch cadence. The discussion remains focused on the risks associated with the Artemis Program and the technical challenges of landing humans on the Moon.