In situ analysis of the collected samples would have been performed by either direct contact or using a lander carrying a high-resolution mass spectrometer.
[4] OKEANOS was a finalist for Japan's Institute of Space and Astronautical Science (ISAS)' 2nd Large Mission Class to be launched in 2026,[2][5][6] and possibly return Trojan asteroid samples to Earth in the 2050s.
[14] The spacecraft was projected to have a mass of about 1,285 kg (2,833 lb) including a possible lander [3] and would have been equipped with solar electric ion engines.
[3][15] The sail would have been made of a 10 μm-thick polyimide film measuring 40 × 40 meters (1600 m2),[2] covered with 30,000 solar panels 25 μm thick, capable of generating up to 5 kW at the distance of Jupiter, 5.2 Astronomical Units from the Sun.
[6][7][10] The main spacecraft would have been located at the center of the sail, equipped with a solar-electric ion engine for maneuvering and propulsion, especially for a possible sample-return trip to Earth.
[3] The spacecraft would have deployed a 100 kg lander [4][1] on the surface of a 20–30 km Trojan asteroid to analyze its subsurface volatile constituents, such as water ice, using a 1-meter pneumatic drill powered by pressurized nitrogen gas.
[1] If a sample-return was to be performed, the lander would have taken off then, rendezvous and deliver the surface and subsurface samples to the mothership hovering above (at 50 km) for subsequent delivery to Earth within a reentry capsule.
GAP-2 would have made it possible to locate the position of Gamma-ray bursts with high precision by pairing it with terrestrial observatories.
EXZIT, as zodiacal light gets significantly weak beyond the asteroid belt, would have enabled the telescope to observe the cosmic infrared background.