ArtSat 2 will accompany Hayabusa 2 on the rocket before being pushed out into deep space. For seven days, on battery power, this sculpture will broadcast Dadaist poetry generated from its own sensor data. Thereafter, it will remain in orbit around the sun as an artificial asteroid for perhaps billions of years. The material from which the sculpture is made is expected to degrade after maybe hundreds of thousands of years (radiation), but a 2D representation of the sculpture in, iirc silicon, will be everlasting.
Last week I met one of the ArtSat project's designers at a Maker Faire. Apparently, they've have spent only around $100,000 on the entire project. Presumably their launch is free or cut-price.