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High-Profile SST Missions

SST's most visible missions — the ones that made headlines, set records, or produced lessons learned. These missions serve as the program's public face and technology proving grounds.

Last updated: 2026-04-14 (session 26 — R5 sub-mission series documented, R5-S7 added)

PhoneSat — The Origin Story (11020)

TRL: 5→7 | Period: 2011-11 → 2014-09 | Lead: Ames Research Center

The mission that proved commercial smartphones could serve as CubeSat avionics.

Flights: - PhoneSat 1.0 (Graham, Bell): 2× 1U CubeSats, launched April 21, 2013 on Antares maiden flight from Wallops Island. Survived planned 1-week mission, re-entered April 27. Sent back Earth imagery. - PhoneSat 2.0β (Alexander): 1× 1U CubeSat, same launch. Upgraded with two-way comms and GPS. - PhoneSat 2.4: launched November 2013 on Minotaur-1. Demonstrated smartphone as avionics controller.

Significance: PhoneSat was SST's first flight mission and one of the earliest demonstrations that COTS consumer electronics could survive in space. Cost: ~$7,000 per satellite. It established ARC as SST's primary CubeSat mission house and proved the "cheap, fast, disposable" philosophy that SST would build on for the next decade.

Downstream: PhoneSat didn't produce a commercial product, but it proved the concept that fed into every subsequent SST mission using COTS components (OCSD, Nodes, V-R3x, Starling). The philosophy was the product.

NTRS: Factsheet available. No extensive publication record found.

Outcome: flew | Confidence: confirmed

Lunar Flashlight — The Instructive Failure (106819)

TRL: 5→8 | Period: 2018-10 → 2023-10 | Lead: JPL | PI: John Baker

A 6U CubeSat designed to map water ice in permanently shadowed craters at the lunar south pole using near-infrared lasers.

Flight: - Launched December 11, 2022 on SLS Artemis I as a secondary payload (alongside other Artemis CubeSats). - Propulsion failure: Within the first few days, 3 of 4 thrusters underperformed. Root cause: debris (metal powder/shavings from additively manufactured fuel feed system) obstructed fuel lines. The ASCENT/AF-M315E green monopropellant system — developed by MSFC — had manufacturing-induced contamination. - Months of troubleshooting (increasing fuel pressure beyond design capacity) produced limited improvement. - Mission terminated May 12, 2023. Spacecraft entered heliocentric orbit after Earth flyby May 17.

What worked: - Sphinx flight computer (JPL) — first-ever-flown low-power radiation-tolerant CubeSat computer for deep space. Surpassed expectations. - Iris radio upgrade — deep-space communications exceeded requirements. - Both Sphinx and Iris represent genuine technology infusion from SST investment.

What failed: - The MSFC-built green propulsion system. The additive manufacturing process introduced debris that was not caught during ground testing. This is a cautionary tale for AM propulsion systems.

NTRS: 35 citations — the most of any SST project except TBIRD. Includes fracture control plans, propulsion development papers, mission design publications from MSFC, JPL, GSFC, and Georgia Tech.

Lessons for SST: 1. Deep-space CubeSat propulsion remains the hardest subsystem — Lunar Flashlight joins FEMTA and dual-mode projects in the "propulsion stall" pattern. 2. Even failed missions produce technology infusion (Sphinx, Iris). 3. The 35 NTRS publications ensure the failure was well-documented and knowledge was preserved.

Outcome: partial failure (propulsion), partial success (avionics, comms) | Confidence: confirmed

ACS3 — Advanced Composite Solar Sail System (95595)

TRL: 6→7 | Period: 2018-07 → 2025-04 | Lead: Ames Research Center (mission ops), Langley Research Center (booms)

NASA's first practical solar sail — propulsion without propellant.

Flight: - Launched April 23, 2024 on Rocket Lab Electron from Māhia, New Zealand. - Spacecraft bus: NanoAvionics (Kongsberg) 12U nanosatellite bus. Size: ~23×23×34 cm. - Solar sail deployed August 29, 2024. Confirmed by telemetry and onboard camera imagery. - Sail: ~80 m² (30 ft × 30 ft), polymer sheet on composite booms. Four 7-meter booms span the diagonals. - Minor issue: One boom slightly bent during deployment while pulling the sail taut. Mission team assessed no impact on objectives; the bend partially straightened as the sail settled. - Currently orbiting Earth, visible to the naked eye from many locations.

Key technology: The composite booms (LaRC) are the innovation — lightweight, compactly packageable, and stiff enough to deploy an 80 m² sail from a 12U CubeSat. Prior solar sails (IKAROS, LightSail 2) used metallic booms.

NTRS: 17 citations spanning ARC (mission), LaRC (booms/mechanisms), flight dynamics, and a 2026 "Mission Results and Lessons Learned" paper.

Downstream: - ACS3 is explicitly a pathfinder for larger solar sail missions: space weather early warning, near-Earth asteroid reconnaissance, communications relays. - NASA's Solar Cruiser (canceled 2023, then reconsidered) would have been the next step. - The composite boom technology has applications beyond sails — deployable antennas, radiators, structural elements.

Outcome: flew (sail deployed, mission ongoing) | Confidence: confirmed

DiskSat — The Shape of Things to Come (106801)

TRL: 5→8 (target) | Period: 2020-09 → 2026-10 | Status: Active | Lead: The Aerospace Corporation | PI: Roger Hunter

A plate-shaped satellite — 40 inches diameter, 1 inch thick — that offers 5–10x more power and surface area than comparable CubeSats.

Flight: - Launched December 18, 2025 on Rocket Lab Electron from Wallops Island, Virginia. - 4 DiskSats deployed into 340-mile orbit. Released one by one from a cylindrical dispenser. - Weight: ~35 lbs each. Aluminum honeycomb core with carbon fiber face sheets. - Space Force involvement — Pentagon co-funded the demonstration.

Why DiskSat matters: - CubeSats are volume-limited (standard form factor constrains power and aperture). DiskSat maintains CubeSat benefits (standard launch interface, low cost, simple design) while breaking the power/aperture ceiling. - Can operate as low as 124 miles altitude (thicker atmosphere would drag conventional satellites down) due to flat profile + active drag management. - Applications: communications constellations, radar sensing, Earth observation, high-power missions that CubeSats can't handle.

People chain — Richard Welle: - PI on OCSD [11587] (optical comms, 2012–2018) - Lead author on DiskSat publications - Both projects at Aerospace Corporation — same person, same org, bridging two of SST's most innovative missions.

NTRS: 2 citations (2022 SmallSat conference paper, 2024 video).

Outcome: in progress (launched, Active) | Confidence: N/A

EDSN/Nodes — Failure and Recovery (10941, 91369)

EDSN: 8× 1.5U CubeSats for swarm networking. Lost in Super Strypi launch failure, November 3, 2015.

Nodes: 2× 1.5U CubeSats built from EDSN spare parts. Deployed from ISS May 16, 2016. Demonstrated first autonomous inter-satellite command relay for CubeSats. Santa Clara University ran ground ops.

The lesson: SST's approach of building extra flight units paid off. When the primary mission was lost to a launch vehicle failure (not a spacecraft problem), the spare parts enabled a recovery mission within 6 months. Nodes achieved the core networking objectives of EDSN with 2 satellites instead of 8.

Outcome: EDSN — lost (launch failure) | Nodes — flew | Confidence: confirmed

CAPSTONE — Cislunar Pathfinder (106820)

TRL: 5→8 | Period: 2019-10 → 2024-05 | Lead: Advanced Space, LLC | PI: Bradley Cheetham

The first spacecraft to demonstrate autonomous cislunar navigation in a Near Rectilinear Halo Orbit (NRHO) — the orbit planned for Gateway.

Flight: - Launched June 28, 2022 on Rocket Lab Electron/Photon from Māhia, New Zealand. - Communications anomaly July 5–6 (recovered). Propulsion anomaly Sep 8 (corrected). - NRHO insertion November 13, 2022. Primary 6-month mission completed May 2023. - Extended mission ongoing — 100+ NRHO orbits as of late 2024. - 12U CubeSat, 55 lbs. Bus: Terran Orbital. Propulsion: Stellar Exploration. Comms: Tethers Unlimited.

Key technology: CAPS (Cis-Lunar Autonomous Positioning Software) — peer-to-peer navigation using LRO as reference beacon. Successfully demonstrated autonomous cislunar navigation without continuous ground contact. Built on SBIR Phase I→II→II-E ladder from Advanced Space's LiAISON algorithm (CU Boulder academic origin).

Downstream: - CAPSTONE Extended Mission: $36.1M (2024–2026) for ongoing optical navigation experiments. - AFRL Oracle: $72M (Nov 2022) — cislunar space domain awareness spacecraft. Direct DoD application of CAPSTONE expertise. - DoD cislunar SDA contracts: ~$8.3M across 9 AFRL/AFSC awards (2023–2025). - Advanced Space total federal footprint: ~$150M+.

NTRS: 7 citations (2020–2024), including post-mission retrospectives: "Pathfinder for Artemis Gateway."

Outcome: flew (mission ongoing) | Confidence: confirmed

See: Advanced Space for full org lineage.

R5 — Launch Fast, Learn Fast (155354)

TRL: 5→9 | Period: 2022-09 → 2025-10 | Lead: Johnson Space Center | PM: Samuel Pedrotty

Ultra-lean 6U CubeSat platform: <$100K in materials per bus, <12 months from payload to orbit, no space-rated components. COTS avionics assembled in shirt-sleeve environment.

Flight history (10 spacecraft, 5 flown):

Spacecraft Launch Vehicle Status Key Payload
R5-S1 (3U) Feb 10, 2022 Astra Rocket-3.3 (ELaNa 41) Lost (launch failure) Cameras, algorithms for EVA inspection
R5-S2 (6U) Jul 3, 2024 Firefly Alpha (ELaNa 43) Flew Cold gas N₂ RCS, Iridium SBD comms
R5-S4 (6U) Jul 3, 2024 Firefly Alpha (ELaNa 43) Flew Cold gas N₂ RCS, LANL ELROI tag
R5-S7 (6U) Nov 28, 2025 SpaceX Transporter-15 Flew First prox ops maneuver post-dispense
R5-S10 (6U) Mar 30, 2026 SpaceX Transporter-16 Flew RPO imager for Momentus Vigoride-7, event camera + star tracker, Solstar WiFi router
R5-S3/S5 2026 anticipated TBD Pending —
R5-S9 2026 anticipated TBD Pending —
  • R5-S2 was a late addition — NASA LSP asked R5 to fill a slot that would otherwise hold a mass simulator; R5 built and delivered a second spacecraft on the same timeline. That's the whole point.
  • R5-S7 was the first R5 spacecraft to execute proximity operations — maneuvering immediately after dispense. Supports future ISAM capabilities.
  • R5-S10 marks R5's transition to commercial partnerships: deployed from Momentus Vigoride-7 OSV, serves as free-flying imager for Vigoride health assessment. Solstar WiFi inter-satellite data relay is a novel crosslink approach. First R5 with a co-aligned event camera and star tracker.
  • R5-S10 launched 5 months after SST project [155354] officially completed (Oct 2025). R5-S3/S5 and R5-S9 still anticipated in 2026 — the series is self-sustaining.

Lineage: Seeker CubeSat (JSC) → PACE initiative (ARC/JSC, 106799) → R5. PACE-1 launched June 30, 2021 on SpaceX Transporter-2. PACE bridged Flight Opportunities and SST programs. Pedrotty is the throughline: Seeker GNC Lead → PACE PI → R5 PM → SPLICE Chief Engineer.

NTRS: "R5-S2/S4 Preliminary On-Orbit Performance" (20240009839). "Avionics Design Architecture for Low-Cost CubeSat Missions" (20240016467, IEEE Aerospace 2025). "Launch Fast Learn Fast: Lessons Learned" (20250006508, SmallSat 2025).

Outcome: flew (5 of 6 attempts; S1 lost to launch failure) | Confidence: confirmed

PY4 — The $5K Swarm (155367)

TRL: 4→8 | Period: 2022-09 → 2025-02 | Lead: Carnegie Mellon University | PI: Zachary Manchester

4 × 1.5U CubeSats demonstrating autonomous swarm operations using radically low-cost hardware.

Flight: - Launched March 4, 2024 on SpaceX Transporter-10 (Falcon 9, Vandenberg SFB). - Built on PyCubed open-source avionics platform (Python-programmable, integrates power/compute/comms/ADCS).

What was demonstrated: - High-data-rate mesh networking - Precise inter-satellite ranging (COTS LoRa radios, two-way time-of-flight) - Range-based relative orbit determination (1-GPS-anchor method) - Magnetorquer-only sun pointing (no reaction wheels) - TID radiation measurements every 30s across 4 nodes

Core innovation: Hardware elimination. One GPS anchor + LoRa ranging reconstitutes full swarm orbital state. No GPS receivers on every node, no propulsion, no reaction wheels. This is the cost-scaling path for constellation missions.

Zachary Manchester: Associate Professor, CMU Robotics Institute. Director, Robotic Exploration Lab (REx Lab). PhD MIT AeroAstro. Founded KickSat (2011). PyCubed is deliberately open-source — no commercial spinout.

Outcome: flew | Confidence: confirmed

CHOMPTT — The Only TRL 9 (93925)

TRL: 4→9 | Period: 2015-02 → 2020-08 | Lead: University of Florida | PI: John Conklin

First CubeSat dedicated to precision optical time transfer. The only SST project to reach TRL 9.

Flight: - Launched December 16, 2018 on Rocket Lab Electron (ELaNa XIX). 491×511 km, 85°. - 3U CubeSat with 1U OPTI payload: chip-scale atomic clocks (CSACs), picosecond event timers, avalanche photodetectors, retroreflectors. - CSAC performance: 75 ps Allan deviation at 1s — 3× better than the 200 ps spec. - Bus derived from EDSN/Nodes (ARC). Partners: AFRL, University of Central Florida (ground laser at KSC TISTEF).

Why it matters: Precision time transfer is foundational for cislunar navigation beyond GPS coverage, distributed aperture arrays, and formation flying. See PNT/Timing for full context.

Downstream: No Transitioned_To or Infused_To in TechPort. The contribution is proving CSACs work on CubeSats — feeding the PNT research community rather than a single product.

Outcome: flew (TRL 9 achieved) | Confidence: confirmed

ISARA — The Antenna That Enabled MarCO (11586)

TRL: 5→7 | Period: 2012-10 → 2018-04 | Lead: Jet Propulsion Laboratory

Integrated Solar Array and Reflectarray Antenna — solar panels that double as a Ka-band high-gain antenna.

Flight: - Deployed from ISS December 6, 2017 (launched Nov 12, 2017 on Cygnus OA-8 "S.S. Gene Cernan"). - Demonstrated 100 Mbps Ka-band downlink — ~10,000x improvement over the 9.6 kbps CubeSat baseline. - Gain measurements matched pre-flight predictions. Clean TRL 7 result. - Also carried CUMULOS (Aerospace Corp remote sensing payload) as secondary experiment.

Key downstream — MarCO (confirmed): The folded flat-panel reflectarray technology developed for ISARA was immediately applied to MarCO (Mars Cube One) — the two 6U CubeSats that flew alongside InSight to Mars in November 2018. MarCO was the first interplanetary CubeSat mission, and its UHF relay was enabled by the same folded-panel reflectarray approach. ISARA is explicitly credited as the enabling predecessor.

NTRS: "The ISARA Mission — Flight Demonstration of a High Gain Ka-Band Antenna for 100Mbps Telecom" (20210008645, JPL 2018).

Outcome: flew | Confidence: confirmed

Summary Table

Mission Year What Result Key Downstream
PhoneSat 2013 COTS smartphone avionics Flew (3+1 sats) COTS philosophy for all SST
EDSN 2015 Swarm networking (8 sats) Lost (launch failure) Spares → Nodes
Nodes 2016 Inter-satellite relay (2 sats) Flew → V-R3x → Starling
ISARA 2017 Ka-band reflectarray (100 Mbps) Flew (ISS deploy) → MarCO (first interplanetary CubeSat)
OCSD 2016 200 Mbps laser comms Flew → TBIRD (1000x)
CHOMPTT 2018 Precision optical time transfer Flew (TRL 9) Cislunar PNT heritage
V-R3x 2021 Radio ranging swarm (3 sats) Flew → Starling MANET
PACE-1 2021 Payload accelerator bus Flew (Transporter-2) → R5 platform
R5-S1 2022 Rapid low-cost CubeSat Lost (Astra failure) → R5-S2/S4
CAPSTONE 2022 Cislunar NRHO pathfinder Flew (100+ orbits) $72M Oracle (AFRL)
TBIRD/PTD-3 2022 200 Gbps laser comms (record) Flew World record
Lunar Flashlight 2022 Lunar ice mapping Partial fail Sphinx, Iris survived
Starling 2023 4-sat swarm autonomy Flew BCT acquired by Raytheon
PY4 2024 Low-cost 4-sat swarm Flew (Transporter-10) Open-source PyCubed
ACS3 2024 Solar sail deployment Flew Pathfinder for larger sails
DORA 2024 1 Gbps deployable optical rx Flew (ISS deploy) Relaxed-pointing optical
R5-S2/S4 2024 Rapid low-cost CubeSat (×2) Flew (Firefly) <$100K per bus
DUPLEX 2025 Dual propulsion CubeSat Flew (ISS deploy Dec 2, 2025) Fiber-fed pulsed plasma (Teflon) + monofilament vaporization (Delrin). 2-year orbital test
HYDROS 2022 Water electrolysis propulsion Flew (PTD-1) First water propulsion in space
R5-S7 2025 First R5 prox ops maneuver Flew (Transporter-15) ISAM inspection capability
DiskSat 2025 Flat-plate satellite form factor Flew (4 sats) Pentagon co-funded
R5-S10 2026 RPO + WiFi crosslink (Momentus) Flew (Transporter-16) First commercial R5 partner