U Sco in 1999. With this recent eruption, all points on the light curve are from amateur astronomy sources. The circles are
for
V-band data, while the diamonds are for
B-band data. Note that the two templates diverge greatly after day 33, with a consequent large shift in color. In this case
(as adopted for the templates displayed in this figure), the sudden dimming would only affect the blue light and not the red
light. The drop in blue brightness is forced only by the 1945 light curve. Alternatively, the visual brightness does not have
any data from day 32 to 44, so it is possible that U Sco underwent a DQ-Her-like dust formation dip of short duration, only
to return to a normal decline as indicated by a few
V-band magnitudes from the 1979 and 1999 light curves.