What is the current value of the scale factor?

[I_wonder]

Do cosmologists know what is the current value of the scale factor? I know we have a current value for the hubble constant H, and I know H=a'/a. But what about the value of a?

Thanks!

[cristo]

Usually, the scale factor is normalised so that it takes the value a(t_0)=1 at present times. See this thread http://www.physicsforums.com/showthread.php?t=222284, for example.