Jasper was a planet in the Silesian Confederacy, the sole inhabited world of the Saginaw System.

In the late 19th Century PD, it served as the sector capital for the Saginaw Sector. Its own capital city was called Onyx.

Its gravity was about one percent higher than Earth's, while its axial inclination was close to that of Sphinx; the length of its year was almost identical to that of Manticore. (HHA5: LD)

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