NASA has reopened one of the quieter lanes into cislunar space: small spacecraft riding alongside Artemis. The agency said organizations interested in launching CubeSats on future Artemis missions should respond to a request for information by Monday, June 1 , for initial consideration. The opportunity is not a mission award yet. It is a market check. NASA wants to know who is ready, what they want to fly, and how those payloads could fit on Artemis III, Artemis IV, and Artemis V while the agency reviews exact mission profiles. CubeSats can deploy after Orion separates from the rocket, turning unused secondary payload capacity into science and technology demonstrations. Credit: AI-generated image September Update: Artemis III Drops the CubeSat Lane NASA's spring request still matters, but the near-term manifest has tightened. A late-September program update says Artemis III will not carry CubeSat secondary payloads , even though the earlier market survey asked teams about possible rides on Artemis III, IV, and V. That changes the opportunity from an immediate three-mission opening into a more selective planning exercise. Artemis III is now being treated as a focused crewed systems demonstration in low Earth orbit, with Orion, SLS, crew procedures, and human landing system interfaces taking priority over extra payload deployment work. The practical read for small spacecraft teams is sharper than it was in May. Artemis IV and Artemis V remain the more plausible windows, and proposals will need to show mature hardware, clear science return, and low integration burden. A CubeSat that needs a custom trajectory, late access, or unusual handling will have a harder case than one that can fit cleanly into an upper-stage deployment plan. Spring RFI 6U / 12U NASA asked for smallsat concepts sized for standard CubeSat classes. Artemis III No slots The first post-Artemis II crew mission is no longer expected to host CubeSats. Best Watch IV and V Later SLS missions are now the cleaner target for secondary payload planning. The shift also gives the RFI a different purpose. NASA is not just asking who wants a ride. It is sorting which payloads are credible enough to survive a crewed Artemis integration review when mission risk, schedule margin, and upper-stage disposal plans are already constrained. What NASA Is Asking For NASA's May 21 notice asks universities, companies, research groups, and other organizations to signal interest in CubeSat opportunities tied to the next three Artemis flights. The agency says the Space Launch System rocket can provide rides for small investigations that support science, technology, and the expansion of human exploration. The request focuses on 6U and 12U CubeSats . A CubeSat unit is a 10 by 10 by 10 centimeter building block, so these spacecraft are compact by design. That constraint is the point. They are small enough to tuck into available payload slots, but capable enough to test instruments, communications hardware, autonomy, propulsion, radiation sensors, and operational concepts beyond low Earth orbit. June 1 RFI response deadline 6U Smaller target class 12U Larger target class III-V Artemis missions in scope Why it matters Artemis secondary payload slots are limited, but they put small spacecraft on trajectories that are expensive to reach any other way. For a cislunar startup or research lab, a single slot can validate hardware in the environment where future lunar infrastructure has to work. The Flight Paths Are Still Flexible NASA says it is still reviewing mission profiles, which means the final deployment options could change. The agency currently expects CubeSats may deploy in Earth orbit or onto a heliocentric disposal trajectory after Orion separates from the rocket. It also says opportunities may exist for CubeSats deployed on a reentry trajectory from Earth orbit. That range matters. A payload that deploys in Earth orbit can test communications, sensors, propulsion, or rapid mission operations near home. A heliocentric trajectory can support radiation, navigation, solar science, and deep-space hardware validation. A reentry trajectory could support heat shield, tracking, communications blackout, or debris survival research. Possible deployment path What it can test Cislunar relevance Earth orbit Operations, communications, autonomy, propulsion checkout Reduces risk before lunar distance missions Heliocentric disposal Radiation sensors, deep-space navigation, solar observations Validates hardware outside Earth's protective environment Reentry trajectory Thermal protection, tracking, breakup and recovery concepts Feeds entry, descent, and disposal planning for lunar systems AI-generated image Small spacecraft can test sensors, software, radiation tolerance, and navigation techniques in the same environment future lunar infrastructure will occupy. A Second Chance After Mixed Artemis I Results NASA has flown CubeSats on Artemis before. The uncrewed Artemis I mission in 2022 carried 10 CubeSats , deployed after the upper stage separated from Orion. Artemis II carried four on its crewed lunar flyby. Those flights proved the ride-share model, but they also showed how unforgiving secondary payload missions can be. CubeSats are often constrained by long prelaunch storage, limited power, tight mass budgets, small antennas, and modest propulsion. A spacecraft can be technically clever and still struggle if batteries self-discharge, if a low-gain antenna cannot close the link, or if a tiny propulsion system underperforms after months on the ground. Artemis slots are valuable, but they are not easy. That is why the new RFI is more than a call for science ideas. It is also a readiness filter. NASA needs payload teams that can survive the integration schedule, meet safety requirements, support mission operations, and deliver useful data even if deployment timing or trajectory details shift. What strong proposals will likely need • Clear mission value: A payload should connect to Artemis science, exploration systems, or cislunar operations. • Storage resilience: Small spacecraft may sit integrated for long periods before launch. • Independent operations: Once deployed, the CubeSat team must handle command, tracking, and data return. • Trajectory tolerance: NASA is still reviewing exact profiles, so flexible mission design helps. AI-generated image Secondary payload teams must fit into the larger Artemis integration flow, where crew mission requirements always come first. Small Payloads, Big Infrastructure Implications The most interesting part of the notice is not the CubeSat form factor. It is the destination set. NASA is asking about payloads tied to Artemis III, IV, and V, a period when the agency is trying to turn one-off lunar missions into repeatable operations. Small spacecraft can help fill the gaps between flagship hardware. A 6U or 12U spacecraft will not build a lunar economy by itself. It can, however, retire one narrow risk that a larger system depends on. A small relay experiment can test antenna pointing. A radiation monitor can map conditions during a specific mission phase. A navigation payload can compare autonomous fixes against ground solutions. A propulsion experiment can prove whether a tiny spacecraft can maneuver enough to be useful after deployment. Those incremental tests are easy to underrate. Cislunar infrastructure will depend on many small capabilities working reliably at once: timing, communications, navigation, thermal control, autonomy, power management, and radiation tolerance. CubeSats give NASA and outside teams a way to test pieces of that stack without waiting for a dedicated lunar spacecraft procurement. Navigation Autonomous position fixes and timing experiments can support future lunar traffic management. Communications Small relays can test antennas, protocols, and low-power links beyond low Earth orbit. Radiation Compact sensors can help characterize exposure during Artemis mission pha