Station Maps for the Occultation by (140) Siwa at Thursday, 2009 November 05 (~ 18:35 UT)


Magnitude of target star 2UCAC 24492527: 13.4 mag
UCAC instrumental „pseudo-R“ fit-model magnitude: 13.5 mag (data from UCAC3)

In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.7 mag (the magnitude of the asteroid).

The max duration is expected to be 5.4 sec.
The event will take place at an altitude of 19 deg and at azimuth 196 deg. The sun will be at an altitude of -26 deg. (At predicted centre line for longitude E 09 deg 19 min)

There is a 1 sigma uncertainty interval of  ± 1.69 path widths.
The probabilities to see a positive event:

Centre line: ~ 23 %
Path limits: ~  22 %
1 sigma lines:  ~ 10 %
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:

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

Good luck with your observation!

Oliver Klös


(140) Siwa, 2009 Nov 05, Station Map SOUTH(140) Siwa, 2009 Nov 05, Station Map NORTH

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