Station Map for the Occultation by (640) Brambilla at Tuesday, 2011 April 12 (~ 18:43 UT)

V-Magnitude of target star TYC 0741-01511-1: 10.8 mag
Johnson B-V Colour Index: + 0.5
UCAC instrumental „pseudo-R“ fit-model magnitude: 10.5 mag (data from UCAC3)

The max duration is expected to be 3.9 sec with a max drop of 4.4 mag.
The event will take place at an altitude of 46 deg and at azimuth 235 deg. The sun will be at an altitude of -11 deg. (At predicted centre line for longitude E 13 deg)

There is a 1 sigma uncertainty interval of  ± 0.75 path widths.
The probabilities to see a positive event:

Centre line: ~  49 %
Path limits: ~  41 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2011_04/0412_640_23644.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20110412_23644_Sites.txt

Good luck with your observation!

Oliver Klös
IOTA-ES