851 Zeissia is an S-type asteroid background asteroid from the inner region of the asteroid belt. Its diameter is about 12 km and it has an albedo of 0.2646 <sup>https://web.archive.org/web/20090817051318/http://www.psi.edu/pds/resource/imps.html</sup>. Its rotation period is 9.34 hours<sup>https://web.archive.org/web/20060614093519/http://www.psi.edu/pds/archive/lc.html</sup>.
The asteroid is named after the German optician and company founder Carl Zeiss.