Nova Sgr 2012 No. 4, spectra comparison at 24-h interval: http://www.astrosurf.com/buil/nova_sgr2012_4/_nova_sgr2012_4_compa.png Halpha intensity increase, other feature are relatively stable. Main webpage: http://www.astrosurf.com/buil/nova_sgr2012_4/obs.htm Christian Buil