Talk:List of galaxies

Correction of absolute magnitude

Almost all of the galaxies listed on this page have a minor error in the info template on the right in their article pages. The error is a false figure given for the absolute magnitude of the galaxy.

For example, for M51 the figure given for abs. mag. was 12.7 while the true abs. magn. is -21.5

However, 12.7 is roughly M51's surface brightness, so I assume the editor unwittingly picked the wrong value. Nevertheless, almost all of the galaxies listed here have to be updated. How to calculate the abs mag see the article.