NGC 3510 was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire on the 11th April 1785. http://astronomy.activeboard.com/t57276058/ngc-3510/
NGC 4961 was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector on the 11th April 1785. http://astronomy.activeboard.com/t57275388/ngc-4961/