[Tex/LaTex] Why is the \copyright symbol in helvet asymmetric

Question

The left © is nicely centered within its circle, while the right one is slightly shifted to the top. Why is that?

Edit: highly related question: how to get good looking copyright and registered symbols?

\documentclass{article}
\usepackage{helvet}
\begin{document}
\copyright~\textsf{\copyright}
\end{document}

Answer 1

Load the textcomp package to get the "real" copyright symbol (also for the cm-fonts):

\documentclass{article}
\usepackage{helvet}
\usepackage{textcomp}
\usepackage[T1]{fontenc}
\begin{document}
\textcircled{c}~\textcopyright~\textsf{\textcircled{c}~\textcopyright}
\end{document}