The nearest found maser object is G23.691+28.777 (offset by 1.6" from input coordinates)
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display_aladin("253.2008330","5.4075000","G23.691+28.777","G23.691+28.777","16503+0529, IRAS 16503+0529, IRAS 16503+0529, RX Oph, RX OPH, J16524821+0524269, RX Oph","0")