The distance of RR Lyrae remained uncertain until 2002 when the Hubble Space Telescope 's Fine Guidance Sensor was used to determine the distance of RR Lyrae within a 5 % margin of error , yielding a value of 854 light-years ( 262 parsecs ) .
The distance of RR Lyrae remained uncertain until 2002 when the Hubble Space Telescope was used to fix its distance within a 5 % margin of error .