The Chinese lunar mansion asterism Nandou (Sgr); star sizes correspond to brightness; stars are numbered both according to the new reconstruction found here (red, historical counting, Table A.1) and the previous assumption (black, modern counting). The new search area for the BC 48 ‘guest star’ east of Nandou’s second star is shown with uncertainty. Previously suggested nova counterparts (NGC 6578, V363 Sgr, M22) and also the CV GSC 06883-00545 (GSC) are outside this field, see text – and do not reflect the record of BC 48, which pertains most certainly to a comet sighting. For the two-star asterism Guo, the three suggested stars are shown.