HE 1523-0901 is the designation given to a red giant star in the Milky Way galaxy approximately 9,900 light-years from Earth.

[5] The star's age, as measured by ESO's Very Large Telescope, is 13.2 billion years.

This makes it among the oldest stars[6] and nearly as old as the estimated age of the universe itself (13.8 billion years as measured by Planck).

[7] It is believed to have formed directly from the remnants of the first-generation stars that reached the end of their longevity and exploded as supernovae early in the history of known matter.

A list of astronomical catalogues can be used to find which catalog a star or other object is from based on its prefix.