Why does this MOVSS instruction use RIP-relative addressing?

I found the following assembly code in disassembler (floating point logic c++).

  842: movss  0x21a(%rip),%xmm0 

I understand that when process rip will allways be 842 and this 0x21a(%rip) will be const. It seems a little odd to use this register.

I want to know is there any advantage of using rip relative address, instead other addressing.