Tags: Planet.

189 Phthia is a bright-coloured rocky main belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on September 9 1878 in Clinton New York and named after Phthia a region of Ancient Greece.Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces New Mexico during 2008 gave a light curve with a period of 22.346 ± 0.001 hours and a brightness variation of 0.26 ± 0.02 in magnitude.

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