SIMBAD references

H. L. Worters, South African Astronomical Observatory (SAAO); S. P. S. Eyres and M. T. Rushton, University of Central Lancashire; and B. Schaefer, Louisiana State University, report that the resumption of optical flickering in the recurrent nova U Sco was detected on Feb. 5.174-5.222 UT, only eight days after the most recent outburst (Jan. 28.4743 UT; cf. IAUC 9111). Flickering was not apparent in any of the observations on each night from Jan. 29 to Feb. 3 with the SAAO 1.9-m telescope and CCD camera. The amplitude of flickering is around 0.2 mag over the course of an hour, consistent with accretion resuming in the system. This means that the ejecta are now becoming optically thin, and an accretion disk has already been re-established, placing a lower limit of 7 days on this event. Further observations are urged to follow development of this rapidly changing recurrent nova, including characterizing eclipses that should now be visible again.