"Persphone: 1 First discovered by mathematical analysis of perturbations in the orbits of certain known comets in 1972. First sighted in 1984. Persphone is retrograde, in an orbit titled sixty-one degrees to the ectiptic. Mass is somewhere less than Saturn.
Possible first explory visit to Persphone was by Alan Jobob Mion in 2094. Mion's claim has cast into doubt by the lack of photographic evidence (his films were damaged by radiation, as was Mion himself; he had stipped shielding from his ship to save fuel) and by Mion's claim that Persphone has a moon. A more formal exploratory expedition, was launched in 2070, Persphone was reported to have no moons and an atmosphere typical of gas giant worlds, rich in hydrogen compounds. The planets atmosphere would be worth scoop-mining if the planet itself were as available as Jupiter."
Protector, Larry Niven
1. When the novel was written Pluto was still considered to be a planet in our solar system, which would make Persephone the tenth planet .
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