U Sco in quiescence. We have a reasonable record of U Sco's brightness (outside of eclipse) in the blue band from my own CCD
observations since 1988 plus deep Schmidt survey plates from earlier times. We see that U Sco varies from around 18–19 mag.
This variation has no apparent connection with the times of the eruptions (indicated by the vertical lines). Schaefer (2005)
has used this information to show that the average magnitude is correlated with the inter-eruption interval, and also that
the next eruption will be in the year 2009.3 ± 1.0. This prediction is predicated on the average brightness after 2005 being
the same as from 1999 to 2004. My new data from 2005 to 2008 show that this assumption is accurate to date; thus the predicted
date (around spring of 2009) is still the best.