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Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
3789 Zhongguo (1928 UF) Discovered 1928-Oct-25 by Chang, Y. C. at Williams Bay
The original planet 1125 China was discovered 1928 Oct. 25 as 1928 UF by Y. C. Chang at Williams Bay and not observed again for many years. It was believed to have been recovered as 1957 UN1 on 1957 Oct. 30 by Chang at Nanking, but this identification was found to be incorrect. In agreement with the discoverer, the designation 1125 China was assigned to planet 1957 UN1. In 1986 C. M. Bardwell and S. Nakano independently identified 1986 QK1 with 1928 UF, and subsequently the permanent number 3789 was assigned to 1928 UF = 1986 QK1.