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A Shortfall of Gravitas

SpaceX

A Shortfall of Gravitas droneship underway – Julia Bergeron (NSF)

A Shortfall of Gravitas (ASOG) is a SpaceX autonomous spaceport droneship (ASDS), operating out of Port Canaveral, Florida. The droneship is based upon barge Marmac 302. A Shortfall of Gravitas is named after a spacecraft titled ‘Experiencing A Significant Gravitas Shortfall‘ from the novel ‘Look to Windward‘, from the Culture series of books by author Iain M. Banks.

A Shortfall of Gravitas was initially announced by Elon Musk in 2018, with a projected service entry in 2019, though further updates were scarce. Musk revisited the topic in October 2020. The sighting of a brand new Octagrabber robot under construction at SpaceX’s Cidco Road facility in Florida in March 2021 further indicated a new droneship was in development. Barge Marmac 302 was ultimately identified as the droneship’s hull by space-offshore.com and local photographers in May 2021, confirming its existence.

 

Elon Musk officially showcased A Shortfall of Gravitas on July 9th, 2021, tweeting a short clip of the droneship operating autonomously during sea trials. A Shortfall of Gravitas arrived at its Florida home port on July 15th, 2021. Its first mission was CRS-23 on August 29th, 2021, which concluded with a successful, near-center landing of Falcon 9 booster B1061.

A Shortfall of Gravitas (ASOG) has often been dubbed “droneship design 3.0” by commentators due to its more refined design compared to SpaceX’s other droneships. A key feature is that its support equipment is neatly integrated into dedicated housing, primarily located on the aft end of the droneship. This configuration creates a larger and more unobstructed landing area for Falcon boosters. ASOG was also the first droneship to debut tapered wings on the landing area, a design improvement that was later retrofitted to Of Course I Still Love You.

Despite its refined design, ASOG still shares core features with its sister droneships, including four azimuth thrusters for station-keeping, an Octagrabber robot for booster securing, communication dishes, firefighting hoses, and robust electrical and engine power systems.

A Shortfall of Gravitas is currently the only droneship officially confirmed to be capable of self-propelled autonomous sailing, a capability famously showcased in a video released by Elon Musk. However, even with this advanced function, ASOG is still typically towed to landing sites by a support vessel. It primarily utilizes its autonomous technology to maintain its precise fixed position during landing operations, similar to how Of Course I Still Love You and Just Read the Instructions operate.

A Shortfall of Gravitas droneship GSE systems. Photo by Julia Bergeron (NSF), labels added by space-offshore.com

Vital Statistics

Operator: SpaceX 

Length: 90 m / 295 ft

Breadth: 40m / 130 ft (Estimated)

Joined SpaceX Fleet: 2021

Successful Landing Attempts
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Unsuccessful Landing Attempt
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