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Murasaki (novel)
''Murasaki'' is a 1992 "shared universe" hard science fiction novel in six parts to which Poul Anderson, Greg Bear, Gregory Benford, David Brin, Nancy Kress and Frederik Pohl each contributed one chapter; it was edited by Robert Silverberg. It is the first anthology of this type to be entirely conceived and written by winners of the Nebula Award.
The scenery is set in a fictional double planet system in orbit around an actually existing red dwarf star (HD36395; also known as Gliese 205 and Wolf 1453〔(3D-map of stars within 20 light years ) (Wolf 1453 - Murasaki - is at 270°, close to the galactic plane) (Archived )〕), about 20 light years from our solar system. Because the system had been first explored by a Japanese robot interstellar probe the star has been given the proper name Murasaki (after the famous Japanese writer, Murasaki Shikibu). The larger of the two planets is Genji, named after Hikaru Genji, the hero of her novel ''Genji Monogatari''; the smaller one is named Chujo, after Genji's close friend Tō no Chūjō.
== Fictional physical characteristics of the Murasaki system ==
Poul Anderson, who had a degree in physics, worked out the physical framework for the anthology based on the characteristics of HD36395 as they were known in the early 1990s: one third of Earth Sun's mass, 82% of its diameter, spectral type M1 with a photosphere temperature of 3,400 K and a maximum emission in the near infrared. (The star is in fact very similar to Gliese 581, now known to have a planetary system.)
The twin terrestrial planets are separated by an average distance of only 156,000 km (about 40% of the Earth-Moon distance). They orbit around their center of mass in 91 hours in locked rotation, which minimizes the effects of the huge tidal forces which they exert on each other. This constellation orbits Murasaki within the habitable zone, at a distance of only 0.223 astronomical units (sidereal year, 66 Earth days) where the planets receive about the same amount of total irradiation Mars gets from the Sun; however, with a spectral power distribution shifted to much longer wavelengths. From this distance the star appears as a disk of 1° 40' diameter, almost three times as large as the Sun (or the Moon) when observed from Earth. Both planets have plate tectonics, causing most of their carbon dioxide being bound in their crusts, and have oxygen-nitrogen atmospheres of Earth-like composition.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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