ARLINGTON, Texas -- After further scientific review, Texas Rangers slugger Josh Hamilton now heads the franchise's record books for the longest home run hit in the history of Rangers Ballpark.

The estimated 468-foot blast Hamilton launched into the upper deck of the right-field porch last Sunday against Houston Astros ace Roy Oswalt will go down as a 490-foot homer, surpassing Jose Canseco's 480-foot home run in 1994, the ballpark's inaugural season.

The Rangers brought in University of Texas at Arlington physics professor Andrew Brandt after HitTrackerOnline.com, a baseball website that tracks how far home runs travel, pegged Hamilton's homer at 485 feet.

Brandt looked into the discrepancy with the help of the Rangers, the operator of HitTrackerOnline.com and Alan Nathan, a physics professor at the University of Illinois at Urbana-Chicago.

Brandt explained why, after a process based on a complex set of variables, the final distance of Hamilton's home run was increased by 22 feet.

"A lot of the other distances of home runs, they consider where you hit it to where it reaches the ground, "Brandt said. "When you add on that extra distance from the upper deck down to the ground, that gives you an extra 25 or so feet. That's putting you in record kind of territory."