--------------------------------------------- PLANET ANOMALY UPDATE 2005 #0-4 (issued 23-May, 16:25 UT) --------------------------------------------- Peak expected to be passed and event on decrease Dear Colleagues, we have placed a finite source on top of the last model calculated on the assumption of a point source before the expected caustic entry took place. As a result, we obtained a reasonable fit to the region of the caustic entry and all data collected by PLANET with the Canopus 1.0m near Hobart and the Danish 1.54m at ESO LaSilla and by OGLE during the caustic passage between HJD=2453511.1937 (20-May, 16:39 UT) and HJD=3512.9325 (22-May, 10:23 UT), where the first data point arises from the Canopus 1.0m and the most recent one from OGLE, who also took the last data point before the caustic entry. Despite the success of our model in the region of the caustic passage, it fails on reproducing the first peak, but we think this is due to the negligence of the orbital motion of the binary lens. We will try to resolve this. Unfortunately, we lack of more recent data that could confirm the model, contradict it, or yield further constraints. If our model is right, the caustic peak is strongly skewed, hanging towards later epochs, and the maximum was reached at HJD=2453512.85 (22-May, 8:25 UT) with 3.9 mag above baseline. We expect a current magnification of 3.3 mag and a decrease with the rather constant rate of 0.45 mag/day until about HJD=245315.5 (25-May, 0:00 UT), where the light curve starts flattening until reaching a minimum near HJD=2453518.2 (27-May, 17:00 UT) at 2.1 mag above baseline. Our model lightcurve along with the data can be found on our webpage. Event: 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. For further information: PLANET: http://planet.iap.fr OGLE: http://www.astrouw.edu.pl/~ftp/ogle/ -------------- 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.