Hello everybody

I created EC keypair via JAVA with secp160r2 template. When I looked at text
form of public key, I saw there this:

"04666d59b1fb53c1c998c12c71731d3a36a37cd995cadeee96c156c8d7c7852b39b5fefd1fa3ce18c7"
 
I know that last 40 bytes present x and y number of ec point but I don't
know what means first byte 04.

It's some compresion or what ?
Does exist some rule for generating of this byte or it's constant value ?. 

In Java I created public key that menas I know ec point(x and y) and now I
need to construct this array  of 41 bytes   

Can somebody help me ?

Thanks

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