ORCA as a Measurable Mission Service

Economic comparison begins when ORCA’s record shows what the system delivers and what the mission supplies. Gastronaut can build that record through a measurable food-production service linking edible output, nutritional contribution, resource use, crew work, reliability, and recovery. The service definition can mature ahead of a flight price or acquisition model while retaining the lineage of every input.

The proposal makes no claim that cultivation costs less than resupply. It identifies the variables NASA would need to test that proposition for a defined mission. An economic assertion thereby becomes a sequence of measurements that another team can inspect, understand, and continue.

Methods before a verdict

The bounded economics synthesis reviewed 39 abstracts from 2,704 unique records and assigned tiers to 21. No full texts were retrieved, and the reading design excluded many records using logistics language. Within the retained set, no tiered record reported a monetary price for crew food. These limits govern what follows and keep the service model tied to the evidence that was actually examined.

Equivalent system mass provides a starting framework. It translates mass, volume, power, cooling, and crew time into a common mass-equivalent basis using scenario-specific factors. Drysdale and colleagues found that the lowest-ESM life-support approach depends on mission duration, environment, infrastructure, crew size, and technology. For the missions studied, physicochemical regeneration was generally more cost-effective. Bioregeneration could contribute salad crops across mission types, staple crops on medium-duration missions, and broader regeneration over decade-scale durations (Drysdale et al. 2003). The abstract did not report the crossover values.

Crew time requires its own model. Olabi and colleagues used videotape work measurement for bioregenerative food preparation and found that tasks do not scale uniformly with crew size (Olabi et al. 1999). In a related food-systems record outside the economics workset, Zeidler and colleagues reported 694.5 crew-hours and 6.31 crew-hours per kilogram during the 2019 EDEN ISS greenhouse phase (Zeidler et al. 2021). These analog figures demonstrate a measurement method. They do not estimate ORCA labor.

System scale can dominate the result. A conceptual mushroom farm reached 88,432 kilograms ESM, with pressurized volume contributing 68 percent (Kovalev et al. 2022). Another architecture, crop, duty cycle, habitat interface, or mission factor could yield another result. Economic capability therefore rests on calculating a value whose inputs point to the system under review rather than inheriting one ESM number.

Confidence is high that mission duration and system boundary determine the meaning of a cultivation cost. Confidence is moderate that ground tests can populate an ORCA service model. Confidence remains low in a mission economic comparison until the platform measures reliability, resources, labor, and food service under a declared scenario. The practical duty is to preserve that uncertainty while building the record needed to reduce it.

Define the service ledger

Gastronaut is developing ORCA as a 2.0-meter-diameter modular cultivation enclosure. Its proposed 0.1 g to 1.0 g research range and nominal 0.5 g to 0.65 g operation are design objectives. ORCA is at approximately TRL 3 to 4 in ground development, with no flight or lunar cycles.

Gastronaut’s internal operating record covers 1,042 ground growth cycles over 18 to 24 months. It can support retrospective analysis of production, interventions, faults, and task categories. The archive does not establish flight reliability, food safety, crew nutritional contribution, variable-gravity performance, or economics. Its proper role is to inform the next ground measurement while remaining distinct from mission evidence.

Five accounts would sit beside each ORCA crop cycle.

The food account follows edible yield through composition, offer, consumption, waste, acceptability, and the share of a defined nutritional requirement supplied.

The resource account measures water, nutrients, gases, energy, cooling, volume, packaging, cleaning materials, consumables, and spares.

The labor account assigns crew and remote-support time to monitoring, planting, maintenance, sampling, harvest, food handling, cleaning, fault response, and recovery.

The continuity account joins uptime and successful cycles with lost crops, alarms, component failures, intervention frequency, recovery time, and residual risk.

The evidence account distinguishes measured, derived, modelled, and assumed values while preserving uncertainty, calibration, missing data, and version.

Together, the accounts support different service definitions. NASA might compare kilograms of safe edible output, nutrient-servings delivered, crew-days of menu contribution, or a contingency-production capability. The ledger preserves the data needed to calculate each without presenting them as interchangeable. System telemetry can then become a mission-service record whose assumptions remain legible as responsibility passes from one decision team to the next.

Design the hardware around the ledger

Measurement can shape system design. Sensors need calibration and provenance; crop and sample identities need to survive transfers. Automation should record its actions, while maintenance and cleaning receive timestamps. Power, water, and gas interfaces should expose measured use rather than nameplate values when possible. Designing for this continuity is part of designing the service itself.

Faults belong beside successful cycles because continuity is part of the proposed service. Reliability can be assessed through a system whose failure, consequence, and recovery can be reconstructed. The next design decision can then follow the evidence, with successes and interruptions carrying equal documentary weight.

A capability milestone NASA can inspect

Gastronaut proposes an ORCA service-accounting demonstration over repeated ground cycles. Before testing, NASA and Gastronaut would define the service unit, mission scenario, measurement boundary, ESM factors, comparator, acceptance thresholds, and uncertainty plan. The resulting evidence package would show observed inputs and outputs, modelled conversions, sensitivity ranges, and unresolved items in one continuous record.

A passing demonstration would establish a measurable ground service under the test conditions. It would establish neither economic superiority nor a flight price, acquisition suitability, NASA adoption, or investor return. Its value would lie in the facts NASA and Gastronaut need for the next evidence decision, together with a record that allows the next review to begin where the last one ended.

References

Drysdale, Alan E., et al. “Life Support Approaches for Mars Missions.” Advances in Space Research, 2003. https://doi.org/10.1016/S0273-1177(02)00658-0.

Gastronaut. Space Food Economics: Evidence Synthesis. Report GAS-B4-ECO-20260822, evidence version 22 Aug. 2026. Research synthesis.

Gastronaut. ORCA Public-Safe System and Evidence Baseline. Evidence version 23 Aug. 2026. Company technical record.

Kovalev, Valeriy S., et al. “Modeling a Lunar Base Mushroom Farm.” Life Sciences in Space Research, 2022. https://doi.org/10.1016/j.lssr.2021.12.005.

Olabi, Ammar, et al. “Work Measurement Videotaping Technique as a Means for Estimating Food Preparation Labor Time of a Bioregenerative Diet.” SAE Technical Paper, 1999. https://doi.org/10.4271/1999-01-2075.

Zeidler, Conrad, et al. “Crew Time and Workload in the EDEN ISS Greenhouse in Antarctica.” Life Sciences in Space Research, 2021. https://doi.org/10.1016/j.lssr.2021.06.003.