These stamps were issued by Japan in March 2008 to commemorate the Astronomical Society of Japan’s centenary. They feature (among other things) the planets, the Subaru Telescope, and the Hayabusa probe, which rendezvoused with near-Earth asteroid 25143 Itokawa, sampled it, and is scheduled to return to Earth in 2010. Information from here.
Astro-philatelics, part 44
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