Alert Notice 779: Recurrent nova U Sco in surprise eruption needs long time series for the next month
June 7, 2022
June 7, 2022
April 3, 2019: Dr. Bradley E. Schaefer (Louisiana State University) provides the following information:
"Frequent monitoring is requested of the recurrent nova U Scorpii over the next year or so to discover the upcoming very-fast eruption. The predicted outburst is for the year 2020.0±0.7. The eruption is likely within the next year, but it could well go off tonight.
"Observers of many types are needed before the next outburst:
October 15, 2008
January 28, 2010: The recurrent nova U Sco has been reported in outburst, and confirming observations and immediate reporting are urgently requested.
U Sco is located at coordinates RA: 16 22 30.80 , Dec: -17 52 43.0 (J2000).
February 8, 2010: Dr. Bradley Schaefer has requested increased optical coverage of the recurrent nova U Scorpii through the end of February 2010 at least. Of greatest interest are calibrated multicolor photometry to follow the evolution of the optical spectrum throughout the outburst, and intensive time-series photometry to study flickering in the system and to time the eclipses. Recent photometry of U Scorpii has indicated that the nova ejecta shell has become optically thin, making the central star visible again.
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Tel. 617-354-0484 FAX 617-354-0665
AAVSO ALERT NOTICE 255 (February 25, 1999)
OUTBURST OF THE RECURRENT NOVA 1616-17 U SCORPII