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Nereid, a satellite of Neptune, has a highly eccentric prograde orbit with asemi-major axis larger than 200 Neptune radius and is classified as anirregular satellite. Although the capture origin of irregular satellites hasbeen widely accepted, several previous studies suggest that Nereid was formedin the circumplanetary disk of Neptune and was ejected outward to the presentlocation by Triton. Our time-series photometric observations confirm that thespin is stable and non-chaotic with a period of 11.5 hr as indicated by Grav etal. (2003). The optical colors of Nereid are indistinguishable from those oftrans-Neptunian objects and Centaurs, especially those with neutral colors. Wealso find the consistency of Nereid's rotation with the size-rotationdistribution of small outer bodies. It is more likely that Nereid originates inan immigrant body captured from a heliocentric orbit which was 4-5 AU away fromNeptune's orbit.

High-Precision Measurements of Brightness Variation of Nereid