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Scalar Tensor Vector Gravity(STVG) is one of modified gravity theoriesdeveloped by John Moffat(2005). MOG is abbreviated name for this theory.It canexplain a galactic rotation curve and the structure formation without darkmatter. It can also explain acceleration universe without dark energy.But,theyobtaion only a spherically symmetric, static vacuum solution about MOG. On thistheory,the gravitational field produced by two point sources is not simply thesum of their respective spherically symmetric static vacuum solutions.However,in arXiv:0805.4774, the method to adapt MOG to extended distribution ofmatter is described by phenomenalism. A new parameter "xi" is introduced inthis phenomenalical description.This paper shows estimation of MOG's xiparameter. In conclusion,"xi" should be less than O(10^2) to reproduce "flat"rotation curves observed.

Estimation of xi parameter on the Moffat Gravity