They found that Methuselah lies 190.1 light-years away. With the star's distance known more precisely, the team was able to work out Methuselah's intrinsic brightness, a necessity for determining its age.
The scientists also applied current theory to learn more about the Methuselah star's burn rate, composition and internal structure, which also shed light on its likely age. For example, HD 140283 has a relatively high oxygen-to-iron ratio, which brings the star's age down from some of the earlier predictions, researchers said.
In the end, the astronomers estimated that HD 140283 was born 14.5 billion years ago, plus or minus 800 million years. Further observations should help bring the Methuselah star's age down even further, making it unequivocally younger than the universe, researchers said.
The new study was published last month in the Astrophysical Journal Letters.
More from SPACE.com:
Stars: The Life And Death Of Stellar Fusion Engines Top 10 Star Mysteries Stars: Formation, Classification and Constellations This article originally appeared on SPACE.com. Copyright 2013 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.