Named after J. Haydn - Austrian composer (1732-1809).
Haydn is a crater on Mercury. It has a diameter of 270 kilometers. Haydn is named for the Austrian composer Joseph Haydn, who lived from 1732 to 1809. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mercury they are named after deceased artists, musicians, painters, and authors who have made outstanding or fundamental contributions to their field and have been recognized as art historically significant figures for more than 50 years.
Image Source. Marker locations are approximate and may not always appear to align with image on map.