A Human colony world in the Sirius star system. Colonized prior to 2100, by 2106 the first colony settlement, Sirius Mater, had a population of nearly 200. Having nearly six times the mass of Earth, Jinx is a heavy gravity world of 1.78 gees. It is a moon of the gas giant Binary, third planet of Sirius A. Jinx is tidally locked to Binary, giving it a slow rotation and a "day" more than four Earth days long. One face, the East End, always points towards Binary. (For someone on Jinx, with Binary filling the sky, the planet does not appear to rotate on its axis. Therefore Jinxians do not orient themselves to a "north pole" or "south pole", but rather to inward-pointing "East End" and outward-pointing "West End".) The shape of Jinx is unique; it was stretched into an egg-shape by Binary's tidal forces, and after its core cooled it retained that shape as tidal forces pushed it away from Binary over billions of years. As a result it resembles an Easter egg, with colored bands of ocean and atmosphere. The Ends are 600 miles higher in altitude than the central sea level, which puts them well out of the atmosphere, and the Jinxians have placed vacuum industries there. Bandersnatchi survive on Jinx, apparently having been there since Slaver Empire times. Jinx is home to the famed Institute of Knowledge, and is one of three or four Human colonies mistakenly settled following erroneous ramrobot signals; see slowboat.
A Human native to Jinx. The heavy gravity makes them short and wide, massively built and very strong, the strongest bipeds in Known Space. It also gives them heart trouble and a short lifespan. Jinxians have a reputation as punsters, and an undeserved stereotype of their superhuman strength being matched by low intelligence. They use sonic stunners for dueling. The loser suffers only loss of "face"; it is said a Jinxian would rather lose an arm. Julian Forward, Emil Horne and "Captain Kidd" were Jinxians.
Reference: "A Relic of the Empire", "The Ethics of Madness", "Flatlander", "Grendel", "The Borderland of Sol"
(Singular Jotok) An intelligent species resembling a spindly starfish, although the adult form is air-breathing and land-dwelling. The pre-Jotok juvenile form is water-breathing and resembles an eel. Upon reaching adulthood, five pre-Jotok gather to form a single adult Jotok, while juvenile fins metamorphose into adult fingers at the ends of the tails-cum-legs. Circulatory systems and brain lobes are joined rather than fused, so that the Jotok is more of a colony creature with a group mind than an individual. The Jotoki were enslaved by the Kzinti long before the Man-Kzin Wars, and remained Kzinti slaves afterward. They are therefore rarely seen in Human Space.
Origin controversy: The Jotoki believe they were once a star-faring race with their own interstellar empire, and that the Kzinti took over the Jotoki empire rather than creating one of their own. However, this appears to contradict an official account which states the Kzinti developed both atomic energy and the gravity polarizer on their own "There had been a time, between the discoveries of atomic power and the gravity polarizer, when it seemed the Kzinti species would destroy itself in wars. Now the Kzinti held many worlds, and the danger was past" ("The Soft Weapon", Neutron Star p. 123). . Note the Jotoki should not be confused with the entirely unrelated Gw'oth, which are water-breathing even as adults.