--------------------------------------------- PLANET ANOMALY UPDATE 2005 #7-1 (issued 4-Jul, 11:50 UT) --------------------------------------------- Long-duration caustic entry in progress Dear Colleagues, further PLANET data on OGLE 2005-BLG-153 / MOA 2005-BLG-23 collected with the Danish 1.54m at ESO LaSilla during the night starting 3-July as well as OGLE data support the interpretation of this event undergoing a caustic entry and with an observed rise show it still being in progress. Data taken with the Danish 1.54m on 2-July late in the night prior to those from the Canopus 1.0m near Hobart (Tasmania) that triggered the PLANET alert seem to support the rise, where the caustic entry might have occured during these observations around HJD=2453554.83 (3-Jul, 7:55 UT). A fold-caustic approximation suggests the caustic entry to last about 2.5 days. Such a long duration together with the bright target makes this event a good candidate for studying a stellar atmosphere. For providing such information, both the beginning and the end of a caustic passage (entry or exit), corresponding to either the leading or the trailing limb passing, are of particular value. From the actual data, the source is expected to complete its caustic entry by HJD=2453557.3 (5-Jul, 19:00 UT), provided the model approximations are valid. A light curve plot and data files for this event are available on our webpage, which is frequently updated. Event: OGLE 2005-BLG-153 / MOA 2005-BLG-23 RA (J2000): 18:04:17.30 Dec (J2000): -28:40:49.3 The baseline I magnitude reported by the OGLE team is 13.953. For more information: PLANET: http://planet.iap.fr OGLE: http://www.astrouw.edu.pl/~ftp/ogle/ MOA: http://www.physics.auckland.ac.nz/moa/ -------------- 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.