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The exclusive reactions $\gamma p \to K^{*0} \Sigma^+(1189)$ and $\gamma p\to K^{0} \pi^{0}\Sigma^+(1189)$, leading to the p 4$\pi^{0}$ final state, havebeen measured with a tagged photon beam for incident energies from threshold upto 2.5 GeV. The experiment has been performed at the tagged photon facility ofthe ELSA accelerator (Bonn). The Crystal Barrel and TAPS detectors werecombined to a photon detector system of almost 4$\pi$ geometrical acceptance.Differential and total cross sections are reported. At energies close to thethreshold, a flat angular distribution has been observed for the reaction$\gamma p\to K^{0} \pi^{0}\Sigma^+$ suggesting dominant s-channel production.$\Sigma^*(1385)$ and higher lying hyperon states have been observed. Anenhancement in the forward direction in the angular distributions of thereaction $\gamma p \to K^{*0}\Sigma^+$ indicates a $t$-channel exchangecontribution to the reaction mechanism. The experimental data are in reasonableagreement with recent theoretical predictions.

K^0 pi^0 Sigma^+ and K^*0 Sigma^+ photoproduction off the proton