Station Map for the Occultation by (895) Helio at Tuesday, 2011 September 20 (~ 18:11 UT)

V-Magnitude of target star TYC 2764-01038-1: 12.5 mag
Johnson B-V Colour Index: + 0.9
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.1 mag (data from UCAC3)

Please notice:
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.2 mag (the magnitude of the asteroid).

The max duration is expected to be 11.7 sec with a max drop of 1.2 mag.
The event will take place at an altitude of 44 deg and at azimuth 83 deg. The sun will be at an altitude of -12 deg. (At predicted centre line for longitude E 15 deg)

There is a 1 sigma uncertainty interval of  ± 0.47 path widths.
The probabilities to see a positive event:

Centre line: ~ 71 %
Path limits: ~ 48 %
1 sigma lines:  ~ 16 %
2 sigma lines: ~ 2 %

(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 your station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):

Good luck with your observation!

Oliver Klös

(895) Helio, 2011 September 20, Station Map

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