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                        PLANET ANOMALY UPDATE 
		              2004 #5-2
                      (issued 10-Jun, 12:45 UT)
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      Ongoing finite source effects after high-magnification peak


Dear Colleagues,

PLANET data collected on OGLE 2004-BLG-254 at the SAAO 1.0m at Sutherland
(South Africa) between Jun-9, 18:50 UT and Jun-10, 4:40 UT, at the Danish 1.54m
at the Danish 1.54m at ESO LaSilla (Chile) on Jun-10 between 2:20 UT and
10:05 UT, as well as OGLE data obtained on Jun-10 between 3:50 UT and 9:55 UT,
reveal the finite size of the source star, where the passage time of its  
radius is about 16 hours. A peak has been passed around 10-Jun, 7:40 UT 
at 4.35 mag above baseline, i.e. at a magnification of ~ 55. 

With finite source effects thus still being significant in this event, a 
recommended continuing dense coverage will allow a measurement of limb
darkening of the source star. Moreover, with a reliable measurement of the
passage time and an assessment of parallax, the mass of the lens star can be
determined.
 
Event:            OGLE 2004-BLG-254
RA (J2000):       17:56:36.20
Dec (J2000):      -32:33:01.8

The baseline I magnitude reported by the OGLE team is 16.330.

For more information, you may consult:
PLANET:    http://planet.iap.fr
OGLE:      http://www.astrouw.edu.pl/~ftp/ogle/ogle3/ews/2004/blg-159.html
MicroFUN:  http://www.astronomy.ohio-state.edu/~microfun/Data/OB04254/

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On behalf of the PLANET collaboration,

Martin Dominik

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