\usepackage[T1]{fontenc}
\usepackage{eulervm}
\renewcommand*{\sfdefault}{pmy}
\usepackage{relsize}
\renewcommand{\Messier}[1]{\footnotesize{\smaller M}\,#1}
\renewcommand{\NGC}[1]{\footnotesize{\smaller NGC}\,#1}
\renewcommand{\IC}[1]{\footnotesize{\smaller IC}\,#1}
\renewcommand{\FlexLabel}[1]{\textbf{#1}}
\AtBeginDocument{\sffamily\boldmath}