--------------------------------------------- PLANET ANOMALY UPDATE 2005 #0-1 (issued 18-May, 18:10 UT) --------------------------------------------- Cusp approach expected prior to pair of fold-caustic passages Dear Colleagues, recent data collected by OGLE and PLANET/Robonet at the Danish 1.54m at ESO LaSilla and the Faulkes North 2.0m has been used to refine our models of this event. We now believe that it is likely that the source is on the approach to a cusp until HJD=2453513.9 (23-May, 9:30 UT) before it enters a fold caustic at around on HJD=2453526.66 (5-June, 3:50 UT), which is exited about 3 days later. This prediction is based on the assumption of a point-like source. An assessment of the source size during the caustic passage could allow the accurate predication of the fold-caustic entry. With a good coverage of all the distinctive features, the characteristics of the underlying binary lens will be well-determined. We aim to keep you up-to-date with the latest developments. A regularly updated light curve showing recent data can be found on our webpage. We now also provide our preliminary data in the form of data tables for informative purposes. OGLE 2005-BLG-018 RA (J2000): 17:51:23.53 Dec (J2000): -29:39:27.8 The baseline I magnitude reported by the OGLE team is 15.532. -------------- On behalf of the PLANET collaboration Martin Dominik Pascal Fouque %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% If you prefer not to receive further PLANET Anomaly Alerts, please send an e-mail to planet@iap.fr.