--------------------------------------------- PLANET ANOMALY ALERT 2005 #4 (issued 19-Jun, 6:40 UT) --------------------------------------------- Caustic exit in OGLE 2005-BLG-128 expected within the next few hours Dear Colleagues, as predicted by the OGLE collaboration, the event OGLE 2005-BLG-128 rose to a caustic exit peak, where PLANET data collected with the Danish 1.54m at LaSilla between HJD=2453540.6105 (19-Jun, 2:39 UT) and HJD=2453540.6701 (19-Jun, 4:05 UT) show a decrease by about 0.5 mag/hour and, together with earlier OGLE data indicate the trailing limb of the caustic exit to occur at HJD=2453540.99 -0.11 +0.44 (19-Jun, 11:50 UT) after a caustic passage time of 18 -3 +11 hrs. While the data yield a reasonable picture, these conclusions crucially depend on each of just two measurements, which might be affected by systematic offsets that cannot be properly assessed at the moment. In order to observe chromatic effects in the light curve and quantify limb darkening of the source star, dense sampling is required now. A light curve plot and data files for this event are available on our webpage, which is frequently updated. Event: OGLE 2005-BLG-128 RA (J2000): 17:46:34.226 Dec (J2000): -33:52:59.9 The baseline I magnitude reported by the OGLE team is 18.765 +/- 0.004. For more information: PLANET: http://planet.iap.fr OGLE: http://www.astrouw.edu.pl/~ftp/ogle/ -------------- On behalf of the PLANET collaboration Martin Dominik %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% If you prefer not to receive further PLANET Anomaly Alerts, please send an e-mail to planet@iap.fr.