An equatorial ultra iron-poor star identified in BOSS C. Allende Prieto, E. Fernández-Alvar, D. S. Aguado, J. I. González Hernández, R. Rebolo, Y. S. Lee, T. C. Beers, C. M. Rockosi and J. Ge A&A, 579 (2015) A98 Published online: 07 July 2015 DOI: 10.1051/0004-6361/201525904