V1369 (Nova Centauri 2013) magnitude estimate: comparison stars?
Hello folks, I've been doing some observations of Nova Centauri 2013 (V1369 Cen). I got its observation chart from VSP (chart ID "13189CZU"), but all 3 comparison stars shown are much dimmer (7.3, 7.6 and 7.8, while I estimate V1369 Cen to be around magnitude 5 right now). I understand that, for interpolation, I need both lower-magnitude and higher-magnitude comparison stars (at least one of each) in the same chart, and ideally of approximate brightness. Should I request more comparison stars? Or am I missing something? Sorry if this is a FAQ; I searched for but could not find an answer. Thanks in advance, -- Durval Menezes.